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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#pragma once
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#include "vcpkg_Checks.h"
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#include <system_error>
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namespace vcpkg
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{
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template<class T>
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class Expected
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{
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public:
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// Constructors are intentionally implicit
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Expected(const std::error_code& ec) : m_error_code(ec), m_t() {}
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Expected(std::errc ec) : Expected(std::make_error_code(ec)) {}
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Expected(const T& t) : m_error_code(), m_t(t) {}
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Expected(T&& t) : m_error_code(), m_t(std::move(t)) {}
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Expected() : Expected(std::error_code(), T()) {}
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Expected(const Expected&) = default;
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Expected(Expected&&) = default;
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Expected& operator=(const Expected&) = default;
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Expected& operator=(Expected&&) = default;
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std::error_code error_code() const { return this->m_error_code; }
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T&& value_or_exit(const LineInfo& line_info) &&
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{
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exit_if_error(line_info);
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return std::move(this->m_t);
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}
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const T& value_or_exit(const LineInfo& line_info) const &
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{
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exit_if_error(line_info);
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return this->m_t;
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}
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const T* get() const
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{
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if (m_error_code)
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{
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return nullptr;
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}
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return &this->m_t;
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}
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T* get()
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{
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if (m_error_code)
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{
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return nullptr;
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}
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return &this->m_t;
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}
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private:
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void exit_if_error(const LineInfo& line_info) const
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{
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Checks::check_exit(line_info, !this->m_error_code, this->m_error_code.message());
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}
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std::error_code m_error_code;
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T m_t;
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};
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}
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