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59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Copyright 2019 Google LLC. All Rights Reserved.
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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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#ifndef THIRD_PARTY_SAPI_UTIL_STATUS_INTERNAL_H_
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#define THIRD_PARTY_SAPI_UTIL_STATUS_INTERNAL_H_
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#include <string>
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#include <type_traits>
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#include "absl/meta/type_traits.h"
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namespace sapi {
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namespace status_internal {
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struct ErrorCodeHolder {
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explicit ErrorCodeHolder(int code) : error_code(code) {}
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template <typename EnumT,
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typename E = typename absl::enable_if_t<std::is_enum<EnumT>::value>>
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operator EnumT() { // NOLINT(runtime/explicit)
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return static_cast<EnumT>(error_code);
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}
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int error_code;
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};
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template <typename StatusT>
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struct status_type_traits {
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private:
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template <typename StatusU>
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static auto CheckMinimalApi(StatusU* s, int* i, std::string* str, bool* b)
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-> decltype(StatusU(ErrorCodeHolder(0), ""), *i = s->error_code(),
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*str = s->error_message(), *b = s->ok(), std::true_type());
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template <typename StatusU>
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static auto CheckMinimalApi(...) -> decltype(std::false_type());
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using minimal_api_type = decltype(CheckMinimalApi<StatusT>(
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static_cast<StatusT*>(0), static_cast<int*>(0),
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static_cast<std::string*>(0), static_cast<bool*>(0)));
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public:
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static constexpr bool is_status = minimal_api_type::value;
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};
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} // namespace status_internal
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} // namespace sapi
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#endif // THIRD_PARTY_SAPI_UTIL_STATUS_INTERNAL_H_
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