macro to automatically select 'static_assert' where possible, default to 'assert' otherwise

auto_assert.cpp

#include <cassert>

#define auto_assert(...) \
    [](auto expression) \
    { \
        if constexpr (noexcept(expression())) \
        { static_assert(expression()); } \
        else \
        { assert(expression()); } \
    } \
    ([&]{ return __VA_ARGS__; })

int main(int argc, char **argv)
{
    auto_assert(1);     // -> static_assert(1)
    auto_assert(argc);  // -> assert(argc)
}