Problem with numeric_limits

Question

Why this doesn't work?

enum : long {MaxValue = std::numeric_limits<long int>::max()};

I'm getting error :Error 1 error C2057: expected constant expression
What isn't constant about it? Limits of long int are known at compile time so what's the problem?

Answer 1

The problem is that although std::numeric_limits<long int>::max() function returns constant value it is called in run-time and you need constant value in compile-time

Probably you can just use LONG_MAX value instead (see climits header)?