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81 lines
2.1 KiB
C++
81 lines
2.1 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 <cstdint>
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#include "libimp/def.h"
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#include "libimp/export.h"
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#include "libimp/fmt_cpo.h"
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LIBIMP_NAMESPACE_BEG_
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using error_code_t = std::uint64_t;
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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 name() const = 0;
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virtual std::string message(error_code_t const &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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error_code_t e_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(error_code_t const &r, error_category const &ec) noexcept;
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/// \brief observers
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error_code_t code() 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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/**
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* \brief @brief Custom defined fmt_to method for imp::fmt
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*/
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namespace detail {
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inline bool tag_invoke(decltype(::LIBIMP::fmt_to), fmt_context &ctx, error_code r) noexcept {
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return fmt_to(ctx, r.message());
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}
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} // namespace detail
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LIBIMP_NAMESPACE_END_
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