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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_CEL_CPP_INTERNAL_STATUS_BUILDER_H_
#define THIRD_PARTY_CEL_CPP_INTERNAL_STATUS_BUILDER_H_
#include <type_traits>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/status/status.h"
namespace cel::internal {
class StatusBuilder;
template <typename Invocable, typename Argument, typename Expected>
inline constexpr bool kResultMatches =
std::is_same_v<std::decay_t<std::invoke_result_t<Invocable, Argument>>,
Expected>;
template <typename Adaptor, typename Builder>
using EnableIfStatusBuilder =
std::enable_if_t<kResultMatches<Adaptor, Builder, StatusBuilder>,
std::invoke_result_t<Adaptor, Builder>>;
template <typename Adaptor, typename Builder>
using EnableIfStatus =
std::enable_if_t<kResultMatches<Adaptor, Builder, absl::Status>,
std::invoke_result_t<Adaptor, Builder>>;
class StatusBuilder final {
public:
StatusBuilder() = default;
explicit StatusBuilder(const absl::Status& status) : status_(status) {}
StatusBuilder(const StatusBuilder&) = default;
StatusBuilder(StatusBuilder&&) = default;
~StatusBuilder() = default;
StatusBuilder& operator=(const StatusBuilder&) = default;
StatusBuilder& operator=(StatusBuilder&&) = default;
bool ok() const { return status_.ok(); }
absl::StatusCode code() const { return status_.code(); }
operator absl::Status() const& { return status_; } // NOLINT
operator absl::Status() && { return std::move(status_); } // NOLINT
template <typename Adaptor>
auto With(
Adaptor&& adaptor) & -> EnableIfStatusBuilder<Adaptor, StatusBuilder&> {
return std::forward<Adaptor>(adaptor)(*this);
}
template <typename Adaptor>
ABSL_MUST_USE_RESULT auto With(
Adaptor&& adaptor) && -> EnableIfStatusBuilder<Adaptor, StatusBuilder&&> {
return std::forward<Adaptor>(adaptor)(std::move(*this));
}
template <typename Adaptor>
auto With(Adaptor&& adaptor) & -> EnableIfStatus<Adaptor, StatusBuilder&> {
return std::forward<Adaptor>(adaptor)(*this);
}
template <typename Adaptor>
ABSL_MUST_USE_RESULT auto With(
Adaptor&& adaptor) && -> EnableIfStatus<Adaptor, StatusBuilder&&> {
return std::forward<Adaptor>(adaptor)(std::move(*this));
}
private:
absl::Status status_;
};
} // namespace cel::internal
#endif // THIRD_PARTY_CEL_CPP_INTERNAL_STATUS_BUILDER_H_