Nvcc c++20 std::variant complie failed

MXXXXXS · October 21, 2023, 1:57am

Here is the source: src/cpp/testGenDataRow.cu

#include <string>
#include <variant>
#include <vector>

using DataRow = std::vector<std::variant<std::string, float, int>>;

int main()
{
  DataRow dataRow;
  dataRow.push_back("2");
  dataRow.push_back(2);
  dataRow.push_back(1.2f);

  return 0;
}

Compile with nvcc src/cpp/testGenDataRow.cu -o testGen.o, everything works fine

c++17 also works: nvcc -std=c++17 src/cpp/testGenDataRow.cu -o testGen.o

But when using c++20: nvcc -std=c++20 src/cpp/testGenDataRow.cu -o testGen.o compile errors occurred

/home/username/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(479): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
        ~_Variant_storage()
        ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::~_Variant_storage() [with _Types=<std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...>::~_Copy_ctor_base() noexcept [with <unnamed>=false, _Types=<std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            implicit generation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::~_Move_ctor_base() noexcept [with <unnamed>=false, _Types=<std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 8 instantiation contexts not shown ]
            instantiation of "void std::_Destroy(_Tp *) [with _Tp=std::variant<std::string, float, int>]" at line 163 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Destroy_aux<<unnamed>>::__destroy(_ForwardIterator, _ForwardIterator) [with <unnamed>=false, _ForwardIterator=std::variant<std::string, float, int> *]" at line 193 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Destroy(_ForwardIterator, _ForwardIterator) [with _ForwardIterator=std::variant<std::string, float, int> *]" at line 850 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::_Destroy(_ForwardIterator, _ForwardIterator, std::allocator<_Tp> &) [with _ForwardIterator=std::variant<std::string, float, int> *, _Tp=std::variant<std::string, float, int>]" at line 731 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "std::vector<_Tp, _Alloc>::~vector() noexcept [with _Tp=std::variant<std::string, float, int>, _Alloc=std::allocator<std::variant<std::string, float, int>>]" at line 9 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(455): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
        { }
        ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage() [with _Types=<std::string, float, int>]" at line 599
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 599
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Copy_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Variant_base<_Types...> [with _Types=<std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::variant<_Types...> [with _Types=<std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::string, float, int>, _Args=<std::variant<std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::string, float, int>, _Up=std::variant<std::string, float, int>, _Args=<std::variant<std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::string, float, int>, _Alloc=std::allocator<std::variant<std::string, float, int>>, _Args=<std::variant<std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::string, float, int>, _Alloc=std::allocator<std::variant<std::string, float, int>>]" at line 10 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=0UL, _Args=<const char (&)[2]>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=0UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=0UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=0UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=0UL, _Args=<const char (&)[2]>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=0UL, _Args=<const char (&)[2]>, _Tp=std::string, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::string, float, int>, _Tp=const char (&)[2], <unnamed>=void, <unnamed>=void, _Tj=std::string, <unnamed>=void]" at line 10 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=2UL, _Args=<int>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=2UL, _Args=<int>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=2UL, _Args=<int>, _Tp=int, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::string, float, int>, _Tp=int, <unnamed>=void, <unnamed>=void, _Tj=int, <unnamed>=void]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=1UL, _Args=<float>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=1UL, _Args=<float>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::string, float, int>, _Np=1UL, _Args=<float>, _Tp=float, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::string, float, int>, _Tp=float, <unnamed>=void, <unnamed>=void, _Tj=float, <unnamed>=void]" at line 12 of src/cpp/testGenDataRow.cu

5 errors detected in the compilation of "src/cpp/testGenDataRow.cu".

System info

$ nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2023 NVIDIA Corporation
Built on Tue_Aug_15_22:02:13_PDT_2023
Cuda compilation tools, release 12.2, V12.2.140
Build cuda_12.2.r12.2/compiler.33191640_0

$ nvidia-smi 
Sat Oct 21 09:55:14 2023       
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.104.12             Driver Version: 535.104.12   CUDA Version: 12.2     |
|-----------------------------------------+----------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |         Memory-Usage | GPU-Util  Compute M. |
|                                         |                      |               MIG M. |
|=========================================+======================+======================|
|   0  NVIDIA GeForce RTX 2060        On  | 00000000:01:00.0  On |                  N/A |
|  0%   54C    P2              31W / 175W |   1419MiB /  6144MiB |      2%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.3 LTS
Release:        22.04
Codename:       jammy

cbuchner1 · October 23, 2023, 10:02am

Would it make any difference if you added std::monostate to the variant?

std::variant<std::monostate, std::string, float, int>

This allows the variant to be default constructible, which is a necessity if you want it to be used in STL containers such as a vector.

MXXXXXS · October 26, 2023, 4:57am

Thanks for replying, but it still not work

Changed the line

using DataRow =
    std::vector<std::variant<std::monostate, std::string, float, int>>;

then compile with

$ nvcc -std=c++20 src/cpp/testGenDataRow.cu -o testGen.o

still got error

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(479): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
        ~_Variant_storage()
        ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::~_Variant_storage() [with _Types=<std::monostate, std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...>::~_Copy_ctor_base() noexcept [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            implicit generation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::~_Move_ctor_base() noexcept [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 88 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 8 instantiation contexts not shown ]
            instantiation of "void std::_Destroy(_Tp *) [with _Tp=std::variant<std::monostate, std::string, float, int>]" at line 163 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Destroy_aux<<unnamed>>::__destroy(_ForwardIterator, _ForwardIterator) [with <unnamed>=false, _ForwardIterator=std::variant<std::monostate, std::string, float, int> *]" at line 193 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Destroy(_ForwardIterator, _ForwardIterator) [with _ForwardIterator=std::variant<std::monostate, std::string, float, int> *]" at line 850 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::_Destroy(_ForwardIterator, _ForwardIterator, std::allocator<_Tp> &) [with _ForwardIterator=std::variant<std::monostate, std::string, float, int> *, _Tp=std::variant<std::monostate, std::string, float, int>]" at line 731 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "std::vector<_Tp, _Alloc>::~vector() noexcept [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 10 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(380): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
        constexpr _Variadic_union() : _M_rest() { }
                                             ^
          detected during:
            instantiation of "std::__detail::__variant::_Variadic_union<_First, _Rest...>::_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" at line 455
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage() [with _Types=<std::monostate, std::string, float, int>]" at line 599
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 599
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Copy_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 2 instantiation contexts not shown ]
            instantiation of class "std::variant<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Up=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(455): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
        { }
        ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage() [with _Types=<std::monostate, std::string, float, int>]" at line 599
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 599
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Copy_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::__detail::__variant::_Variant_base<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of class "std::variant<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Up=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(391): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_rest(in_place_index<_Np-1>, std::forward<_Args>(__args)...)
            ^
          detected during:
            instantiation of "std::__detail::__variant::_Variadic_union<_First, _Rest...>::_Variadic_union(std::in_place_index_t<_Np>, _Args &&...) [with _First=std::monostate, _Rest=<std::string, float, int>, _Np=1UL, _Args=<std::string>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<1UL> &, std::string>]" at line 115 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Construct(_Tp *, _Args &&...) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<1UL> &, std::string>]" at line 185
            instantiation of "void std::__detail::__variant::__raw_idx_visit(_Visitor &&, _Variants &&...) [with _Visitor=lambda [](auto &&, auto) mutable->auto, _Variants=<std::variant<std::monostate, std::string, float, int>>]" at line 608
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 3 instantiation contexts not shown ]
            instantiation of class "std::variant<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Up=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(391): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_rest(in_place_index<_Np-1>, std::forward<_Args>(__args)...)
            ^
          detected during:
            instantiation of "std::__detail::__variant::_Variadic_union<_First, _Rest...>::_Variadic_union(std::in_place_index_t<_Np>, _Args &&...) [with _First=std::monostate, _Rest=<std::string, float, int>, _Np=2UL, _Args=<float>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<2UL> &, float>]" at line 115 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Construct(_Tp *, _Args &&...) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<2UL> &, float>]" at line 185
            instantiation of "void std::__detail::__variant::__raw_idx_visit(_Visitor &&, _Variants &&...) [with _Visitor=lambda [](auto &&, auto) mutable->auto, _Variants=<std::variant<std::monostate, std::string, float, int>>]" at line 608
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 3 instantiation contexts not shown ]
            instantiation of class "std::variant<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Up=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(391): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_rest(in_place_index<_Np-1>, std::forward<_Args>(__args)...)
            ^
          detected during:
            instantiation of "std::__detail::__variant::_Variadic_union<_First, _Rest...>::_Variadic_union(std::in_place_index_t<_Np>, _Args &&...) [with _First=std::monostate, _Rest=<std::string, float, int>, _Np=3UL, _Args=<int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<3UL> &, int>]" at line 115 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "void std::_Construct(_Tp *, _Args &&...) [with _Tp=std::__detail::__variant::_Variadic_union<std::monostate, std::string, float, int>, _Args=<const std::in_place_index_t<3UL> &, int>]" at line 185
            instantiation of "void std::__detail::__variant::__raw_idx_visit(_Visitor &&, _Variants &&...) [with _Visitor=lambda [](auto &&, auto) mutable->auto, _Variants=<std::variant<std::monostate, std::string, float, int>>]" at line 608
            instantiation of "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...>::_Move_ctor_base(std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> &&) [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            [ 3 instantiation contexts not shown ]
            instantiation of class "std::variant<_Types...> [with _Types=<std::monostate, std::string, float, int>]" at line 97 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_construct.h
            instantiation of "auto std::construct_at(_Tp *, _Args &&...)->decltype((<expression>)) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 518 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/alloc_traits.h
            instantiation of "void std::allocator_traits<std::allocator<_Tp>>::construct(std::allocator_traits<std::allocator<_Tp>>::allocator_type &, _Up *, _Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Up=std::variant<std::monostate, std::string, float, int>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 118 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/vector.tcc
            instantiation of "std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args &&...) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>, _Args=<std::variant<std::monostate, std::string, float, int>>]" at line 1294 of /home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/bits/stl_vector.h
            instantiation of "void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type &&) [with _Tp=std::variant<std::monostate, std::string, float, int>, _Alloc=std::allocator<std::variant<std::monostate, std::string, float, int>>]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(391): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::string, _Rest=<float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_rest(in_place_index<_Np-1>, std::forward<_Args>(__args)...)
            ^
          detected during:
            instantiation of "std::__detail::__variant::_Variadic_union<_First, _Rest...>::_Variadic_union(std::in_place_index_t<_Np>, _Args &&...) [with _First=std::monostate, _Rest=<std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>]" at line 460
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::monostate, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::monostate, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            [ 3 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::monostate, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>, _Tp=std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::monostate, std::string, float, int>, _Tp=const char (&)[2], <unnamed>=void, <unnamed>=void, _Tj=std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, <unnamed>=void]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::monostate, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::monostate, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::monostate, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=1UL, _Args=<const char (&)[2]>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=1UL, _Args=<const char (&)[2]>, _Tp=std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::monostate, std::string, float, int>, _Tp=const char (&)[2], <unnamed>=void, <unnamed>=void, _Tj=std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, <unnamed>=void]" at line 11 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=3UL, _Args=<int>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::monostate, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=3UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::monostate, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=3UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::monostate, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=3UL, _Args=<int>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=3UL, _Args=<int>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=3UL, _Args=<int>, _Tp=int, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::monostate, std::string, float, int>, _Tp=int, <unnamed>=void, <unnamed>=void, _Tj=int, <unnamed>=void]" at line 12 of src/cpp/testGenDataRow.cu

/home/aqua/miniconda3/x86_64-conda-linux-gnu/include/c++/12.3.0/variant(460): error: function "std::__detail::__variant::_Variadic_union<_First, _Rest...>::~_Variadic_union() [with _First=std::monostate, _Rest=<std::string, float, int>]" (declared at line 400) cannot be referenced -- it is a deleted function
   : _M_u(in_place_index<_Np>, std::forward<_Args>(__args)...),
         ^
          detected during:
            instantiation of "std::__detail::__variant::_Variant_storage<false, _Types...>::_Variant_storage(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=2UL, _Args=<float>]" at line 747
            implicit generation of "std::__detail::__variant::_Copy_ctor_base<false, std::monostate, std::string, float, int>::_Copy_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Copy_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            implicit generation of "std::__detail::__variant::_Move_ctor_base<false, std::monostate, std::string, float, int>::_Move_ctor_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_ctor_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            [ 2 instantiation contexts not shown ]
            implicit generation of "std::__detail::__variant::_Move_assign_base<false, std::monostate, std::string, float, int>::_Move_assign_base(std::in_place_index_t<_Np>, _Args &&...) [with _Np=2UL, _Args=<float>]" at line 747
            instantiation of class "std::__detail::__variant::_Move_assign_base<<unnamed>, _Types...> [with <unnamed>=false, _Types=<std::monostate, std::string, float, int>]" at line 747
            instantiation of "std::__detail::__variant::_Variant_base<_Types...>::_Variant_base(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=2UL, _Args=<float>]" at line 1447
            instantiation of "std::variant<_Types...>::variant(std::in_place_index_t<_Np>, _Args &&...) [with _Types=<std::monostate, std::string, float, int>, _Np=2UL, _Args=<float>, _Tp=float, <unnamed>=void]" at line 1420
            instantiation of "std::variant<_Types...>::variant(_Tp &&) [with _Types=<std::monostate, std::string, float, int>, _Tp=float, <unnamed>=void, <unnamed>=void, _Tj=float, <unnamed>=void]" at line 13 of src/cpp/testGenDataRow.cu

10 errors detected in the compilation of "src/cpp/testGenDataRow.cu".

wodtko · July 24, 2024, 4:36pm

Any updates on this?
I just ran into the same issue when compiling Cuda code using C++20 and linking other libraries using std::variant.

Robert_Crovella · July 24, 2024, 5:57pm

MXXXXXS:

#include <string>
#include <variant>
#include <vector>

using DataRow = std::vector<std::variant<std::string, float, int>>;

int main()
{
  DataRow dataRow;
  dataRow.push_back("2");
  dataRow.push_back(2);
  dataRow.push_back(1.2f);

  return 0;
}

The above, original code posted in this thread seems to compile without error on CUDA 12.4.1 with -std=c++20. See here.

Upgrade to the latest CUDA version.

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Nvcc c++20 std::variant complie failed

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