compile-time constants: any possibility without using #define ?

In my program i have a lot of parameters that are changed rarely, so i don’t mind recompiling when they change. The compiler should detect those as constants to save registers/variables, unroll loops and so on. But i really don’t like #defines. I tried to put my constants in a header file like this

const struct


  int a;

  float b;

  int c;

} CRAND = {





and i can use it in my C+±code. But when i try to use it in a kernel, i get error: identifier “CRAND” is undefined

Any advise?


Use enums.

enums only work for ints.

My workaround now is that i put the constant struct into a header file and i include it once for all the host code and once in every kernel. That works, it’s ok for me, but there really should be a more elegant solution, right? I thought that i’m just missing something obvious. Thanks for the answers so far.

I use static const instead of #define.

static const int a = 1;
static const float b = 2.0f;
static const int c = 3;

It’s the “preferred” way in C++ because static const carries type information. It’s just as good as #define when it comes to compiler optimizations based on constants.