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1bdfedf3c6
This adds a lightweight, easy to use std::variant wrapper intended to be used as a return type for functions that can return either a result or an error code.
30 lines
995 B
C++
30 lines
995 B
C++
// Copyright 2018 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <variant>
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namespace Common
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{
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template <typename ResultCode, typename T>
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class Result final
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{
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public:
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Result(ResultCode code) : m_variant{code} {}
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Result(const T& t) : m_variant{t} {}
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Result(T&& t) : m_variant{std::move(t)} {}
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explicit operator bool() const { return Succeeded(); }
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bool Succeeded() const { return std::holds_alternative<T>(m_variant); }
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// Must only be called when Succeeded() returns false.
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ResultCode Error() const { return std::get<ResultCode>(m_variant); }
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// Must only be called when Succeeded() returns true.
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const T& operator*() const { return std::get<T>(m_variant); }
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const T* operator->() const { return &std::get<T>(m_variant); }
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T& operator*() { return std::get<T>(m_variant); }
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T* operator->() { return &std::get<T>(m_variant); }
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private:
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std::variant<ResultCode, T> m_variant;
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};
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} // namespace Common
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