tres.hpp

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#pragma once
 
#include "tmay.hpp"
 
namespace by {
 
    template <typename T, typename R> class tres: public tmay<T> {
        typedef tres<T, R> __me__;
        BY(ME(__me__, tmay<T>))
 
    public:
        tres() = default;
        explicit tres(const T& value);
        explicit tres(const R& value);
 
    public:
        R& getErr();
        const R& getErr() const BY_CONST_FUNC(getErr())
        void rel() override;
        void set(const T& arg) override;
        void setErr(const R& arg);
 
    private:
        std::optional<R> _err;
    };
}