toString.h

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#pragma once

#include <string>
#include <scl/macros.h>
#include <scl/tools/meta/enable_if.h>
#include <scl/tools/meta/void_t.h>
#include <scl/tools/meta/exists.h>
#include <scl/tools/meta/type_mod.h>
#include <scl/tools/meta/is_same.h>
#include <scl/tools/meta/defines_std_to_string.h>

namespace scl{
    namespace utils{
        template <class T, class=void>
        struct ToString;

        template <class T>
        struct ToString<T, META::enable_if_t<
            META::is_same<T, char>()
            || META::is_same<T, const char*>()
            || META::is_same<T, std::string>()
        >>{
            std::string operator()(const T& t) const{
                return std::string{t};
            }
        };

        template <class T>
        struct ToString<T, META::enable_if_t<
            META::defines_std_to_string<T>()
        >>{
            std::string operator()(const T& t) const{
                return std::to_string(t);
            }
        };

        template <class T>
        std::string toString(const T& obj){
            static_assert(
                META::exists<ToString<META::decay_t<T>>>(),
                "ToString<T> has not been defined"
            );
            return ToString<META::decay_t<T>>{}(obj);
        }
    }
}