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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/**
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* @file libimp/error.h
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* @author mutouyun (orz@orzz.org)
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* @brief A platform-dependent error code.
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* @date 2022-12-18
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*/
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#pragma once
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#include <string>
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#include "libimp/def.h"
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#include "libimp/export.h"
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#include "libimp/result.h"
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#include "libimp/fmt_cpo.h"
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LIBIMP_NAMESPACE_BEG_
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/**
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* @brief Serves as the base class for specific error category types.
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* @see https://en.cppreference.com/w/cpp/error/error_category
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*/
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class LIBIMP_EXPORT error_category {
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public:
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error_category(error_category const &) = delete;
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error_category &operator=(error_category const &) = delete;
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constexpr error_category() noexcept = default;
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virtual ~error_category() noexcept = default;
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/// @brief observer
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virtual std::string message(result_code r) const = 0;
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/// @brief comparison function
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bool operator==(error_category const &rhs) const noexcept;
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};
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/**
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* @brief Identifies the generic error category.
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* @see https://en.cppreference.com/w/cpp/error/generic_category
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*/
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LIBIMP_EXPORT error_category const &generic_category() noexcept;
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/**
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* @brief The error code object.
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* @see https://en.cppreference.com/w/cpp/error/error_code
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*/
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class LIBIMP_EXPORT error_code {
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result_code r_code_;
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error_category const *ec_;
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public:
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/// @brief constructors
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error_code() noexcept;
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error_code(result_code r, error_category const &ec) noexcept;
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/// @brief observers
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result_code code() const noexcept;
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result_type value() const noexcept;
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error_category const &category() const noexcept;
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std::string message() const;
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explicit operator bool() const noexcept;
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/// @brief comparison functions
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friend LIBIMP_EXPORT bool operator==(error_code const &lhs, error_code const &rhs) noexcept;
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friend LIBIMP_EXPORT bool operator!=(error_code const &lhs, error_code const &rhs) noexcept;
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};
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LIBIMP_NAMESPACE_END_
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