84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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* Copyright (c) 2023, Alibaba Group Holding Limited;
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <system_error>
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namespace struct_pack {
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enum class errc {
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ok = 0,
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no_buffer_space,
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invalid_buffer,
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hash_conflict,
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invalid_width_of_container_length,
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};
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namespace detail {
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inline constexpr std::string_view make_error_message(errc ec) noexcept {
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switch (ec) {
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case errc::ok:
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return "ok";
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case errc::no_buffer_space:
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return "no buffer space";
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case errc::invalid_buffer:
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return "invalid argument";
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case errc::hash_conflict:
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return "hash conflict";
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case errc::invalid_width_of_container_length:
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return "invalid width of container length";
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default:
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return "(unrecognized error)";
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}
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}
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} // namespace detail
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struct err_code {
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public:
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errc ec;
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constexpr err_code() noexcept : ec(errc::ok) {}
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constexpr err_code(errc ec) noexcept : ec(ec){};
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constexpr err_code& operator=(errc ec) noexcept {
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this->ec = ec;
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return *this;
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}
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constexpr err_code(const err_code& err_code) noexcept = default;
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constexpr err_code& operator=(const err_code& o) noexcept = default;
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constexpr operator errc() const noexcept { return ec; }
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constexpr operator bool() const noexcept { return ec != errc::ok; }
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constexpr int val() const noexcept { return static_cast<int>(ec); }
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constexpr std::string_view message() const noexcept {
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return detail::make_error_message(ec);
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}
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};
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namespace detail {
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class struct_pack_category : public std::error_category {
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public:
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virtual const char* name() const noexcept override {
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return "struct_pack::category";
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}
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virtual std::string message(int err_val) const override {
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return std::string{make_error_message(static_cast<errc>(err_val))};
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}
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};
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inline const std::error_category& category() {
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static struct_pack::detail::struct_pack_category instance;
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return instance;
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}
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} // namespace detail
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} // namespace struct_pack
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