static_assert
From cppreference.com
Defined in header
<assert.h>
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#define static_assert _Static_assert
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This convenience macro expands to the keyword _Static_assert
[edit] Example
Run this code
#include <assert.h> int main(void) { static_assert(2 + 2 == 4, "2+2 isn't 4"); // well-formed static_assert(sizeof(int) < sizeof(char), "this program requires that int is less than char"); // compile-time error }