_Static_assert

_Static_assert evaluates a constant expression at compile time. If the expression is equal to 0, the compiler will produce an error message containing the string literal given as the second parameter.

Parameters

condition	-	constant expression
str	-	string literal

Return Value

(none)

Example

Run this code

#define BUFFER_SIZE 2048
 
int main (int argc, char **argv)
{
	// Test if math works.
	_Static_assert(2 + 2 == 4, "Whoa dude!");
 
        // This will produce an error at compile time.
        _Static_assert(BUFFER_SIZE <= 1024, "BUFFER_SIZE is too big");
 
	return 0;
}