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title Warning C26497
ms.date 03/22/2018
f1_keywords
C26497
USE_CONSTEXPR_FOR_FUNCTION
helpviewer_keywords
C26497
description CppCoreCheck rule that enforces C++ Core Guidelines F.4

Warning C26497

This function function-name could be marked constexpr if compile-time evaluation is desired (f.4).

See also

C++ Core Guidelines F.4.

Example

const int GetTheAnswer(int x) noexcept { return 42 + x; } // Could be marked constexpr

void function1() noexcept
{
    const int theAnswer = GetTheAnswer(0);
}

To reduce code analysis noise on new code, this warning isn't issued if the function has an empty implementation.

int function1(){  // no C26497
    return 1;
}
void function2(){} // no C26497