= Constexpr =

Constexpr is this great C++11 feature that marks a value or function to be
known/executed at compile time. This is great for things likes config.hpp
files, compile time string hashes, and more.

== Example ==

{{{C++
    unsigned int constexpr const_hash(char const *str){
        return *input ? 
            static_cast<unsigned_int>(*input) + 33 * const_hash(input + 1) :
            5381;
    }
    
    void main(){
        constexpr char* const_str = "12345";
        switch(const_hash(const_str)){
        case const_hash("12345"):
            std::cout << "Found 12345\n";
            break;
        case const_hash("54321"):
            std::cout << "Found 54321\n";
            break;
        }
    }
}}}

Switch statements can only accept integers in C/C++, however using this we can
convert compile time strings into integers. This is wonderful for making code
more readable, without relying to much on C macros, which are not type aware.

[[C++]]