error.hpp

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#ifndef __DCONV_ERROR_HPP__
#define __DCONV_ERROR_HPP__
 
// C++.
#include <system_error>
#include <string>
 
namespace dconv
{
    enum class Errc
    {
        Success = 0,   
        InvalidNumber, 
        NotDouble,     
    };
 
    class ErrorCategory : public std::error_category
    {
    public:
        const char* name () const noexcept override
        {
            return "dconv";
        }
 
        std::string message (int code) const override
        {
            switch (static_cast<Errc> (code))
            {
                case Errc::InvalidNumber:
                    return "number is invalid";
                case Errc::NotDouble:
                    return "number is an integer";
                default:
                    return "success";
            }
        }
    };
 
    inline const ErrorCategory errorCategoryInstance;
 
    inline const std::error_category& errorCategory () noexcept
    {
        return errorCategoryInstance;
    }
 
    inline std::error_code make_error_code (Errc code) noexcept
    {
        return std::error_code (static_cast<int> (code), errorCategory ());
    }
 
    inline std::error_condition make_error_condition (Errc code) noexcept
    {
        return std::error_condition (static_cast<int> (code), errorCategory ());
    }
}
 
namespace std
{
    template <>
    struct is_error_code_enum<dconv::Errc> : public true_type
    {
    };
}
 
#endif