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74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
/**
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* @file libimp/system.h
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* @author mutouyun (orz@orzz.org)
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* @brief Isolation and encapsulation of system APIs
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* @date 2022-08-07
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*/
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#pragma once
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#include <string>
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#include <ostream> // std::ostream
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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/result.h"
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#include "libimp/fmt_cpo.h"
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LIBIMP_NAMESPACE_BEG_
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namespace sys {
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/**
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* @brief Get/Set the system error code
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*/
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LIBIMP_EXPORT result_code error_code() noexcept;
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LIBIMP_EXPORT void error_code(result_code) noexcept;
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/**
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* @brief Gets a text description of the system error
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*/
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LIBIMP_EXPORT std::string error_str(result_code) noexcept;
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/**
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* @brief A text description string with an error number attached
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*/
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LIBIMP_EXPORT std::string error_msg(result_code) noexcept;
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/**
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* @brief The system error object.
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*/
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class LIBIMP_EXPORT error {
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result_code r_code_;
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public:
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explicit error() noexcept;
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explicit error(result_code rc) noexcept;
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result_code code() const noexcept;
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std::uint64_t value() const noexcept;
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explicit operator bool() const noexcept;
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std::string str() const noexcept;
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friend LIBIMP_EXPORT bool operator==(error const &lhs, error const &rhs) noexcept;
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friend LIBIMP_EXPORT bool operator!=(error const &lhs, error const &rhs) noexcept;
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};
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/**
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* @brief Get system configuration information at run time
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*/
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enum class info : std::int32_t {
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page_size,
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};
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LIBIMP_EXPORT result<std::int64_t> conf(info) noexcept;
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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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inline bool tag_invoke(decltype(::LIBIMP::fmt_to), fmt_context &ctx, error r) noexcept {
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return fmt_to(ctx, error_msg(r.code()));
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}
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} // namespace sys
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LIBIMP_NAMESPACE_END_
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