Is constexpr useful for overload

Question

Is there a way in c++ to get a different overload called based on the runtime/compile time constness of an input? My version(12) of MSVC can\'t do this using constexpr. Reading

Answer 1

Your code is illegal.

[C++11, dcl.constexpr] The constexpr specifier shall be applied only to the definition of a variable, the declaration of a function or function template, or the declaration of a static data member of a literal type (3.9). ... [ Note: Function parameters cannot be declared constexpr. — end note ]

constexpr doesn't even exist in MSVC 2013, so you couldn't try it even if you wanted to. Also, if you're wondering why the feature isn't allowed, see constexpr overloading.