ErrorCategory.h

#ifndef SSP21_ERRORCATEGORY_H
#define SSP21_ERRORCATEGORY_H

#include <system_error>
#include <string>

#if (defined _MSC_VER && (_MSC_VER < 1900))
#define NOEXCEPT
#else
#define NOEXCEPT noexcept
#endif

namespace ssp21
{

    template <class EnumSpec>
    class ErrorCategory final : public std::error_category
    {
    public:

        static const std::error_category& get()
        {
            static ErrorCategory instance;
            return instance;
        }

        virtual const char* name() const NOEXCEPT
        {
            return EnumSpec::name;
        }

        virtual std::string message(int ev) const
        {
            return EnumSpec::to_string(static_cast<typename EnumSpec::enum_type_t>(ev));
        }

    private:

        ErrorCategory() {}
        ErrorCategory(const ErrorCategory&) = delete;
    };
}

#endif