native_printable.h

// Description: Printable concept for native types

#ifndef PASTELSYS_NATIVE_PRINTABLE_H
#define PASTELSYS_NATIVE_PRINTABLE_H

#include "pastel/sys/printable/printable_concept.h"

#include <sstream>
#include <type_traits>

namespace Pastel
{

    // Printable

    // Visual Studio 2015 CTP6 has a bug in SFINAE overloading,
    // which is triggered by using Requires here. The use of 
    // RequiresC instead avoids the bug.

    template <
        typename Type,
        RequiresC<
            std::is_arithmetic<Type>::value
        > = 0
        >
    std::string asString(Type that)
    {
        std::stringstream stream;
        stream << that;

        std::string text;
        stream >> text;

        return text;
    }

    template <
        typename Type,
        RequiresC<
            Or<
                std::is_same<Type, char>,
                std::is_same<Type, wchar_t>,
                std::is_same<Type, char16_t>,
                std::is_same<Type, char32_t>
            >::value
        > = 0
        >
    std::string asString(const Type* that)
    {
        return {that};
    }

    template <
        typename Type,
        RequiresC<
            std::is_enum<Type>::value
        > = 0
        >
    std::string asString(Type that)
    {
        using Pastel::asString;
        // Reduce enums to integers.
        return asString((std::underlying_type_t<Type>)that);
    }

    inline std::string asString(std::string that)
    {
        return that;
    }

}

#endif