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114 lines (86 loc) · 3.29 KB
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// Copyright 2023 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.
// IWYU pragma: private, include "common/type.h"
// IWYU pragma: friend "common/type.h"
#ifndef THIRD_PARTY_CEL_CPP_COMMON_TYPES_OPTIONAL_TYPE_H_
#define THIRD_PARTY_CEL_CPP_COMMON_TYPES_OPTIONAL_TYPE_H_
#include <ostream>
#include <string>
#include <type_traits>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/base/nullability.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "absl/types/span.h"
#include "absl/utility/utility.h"
#include "common/type_kind.h"
#include "common/types/opaque_type.h"
#include "google/protobuf/arena.h"
namespace cel {
class Type;
class TypeParameters;
class OptionalType final {
public:
static constexpr TypeKind kKind = TypeKind::kOpaque;
static constexpr absl::string_view kName = "optional_type";
// By default, this type is `optional(dyn)`. Unless you can help it, you
// should choose a more specific optional type.
OptionalType();
OptionalType(google::protobuf::Arena* absl_nonnull arena, const Type& parameter)
: OptionalType(
absl::in_place,
OpaqueType(arena, kName, absl::MakeConstSpan(¶meter, 1))) {}
static TypeKind kind() { return kKind; }
static absl::string_view name() { return kName; }
std::string DebugString() const { return opaque_.DebugString(); }
TypeParameters GetParameters() const ABSL_ATTRIBUTE_LIFETIME_BOUND;
Type GetParameter() const ABSL_ATTRIBUTE_LIFETIME_BOUND;
explicit operator bool() const { return static_cast<bool>(opaque_); }
template <typename H>
friend H AbslHashValue(H state, const OptionalType& type) {
return H::combine(std::move(state), type.opaque_);
}
friend bool operator==(const OptionalType& lhs, const OptionalType& rhs) {
return lhs.opaque_ == rhs.opaque_;
}
private:
friend class OpaqueType;
OptionalType(absl::in_place_t, OpaqueType type) : opaque_(std::move(type)) {}
OpaqueType opaque_;
};
inline bool operator!=(const OptionalType& lhs, const OptionalType& rhs) {
return !operator==(lhs, rhs);
}
inline std::ostream& operator<<(std::ostream& out, const OptionalType& type) {
return out << type.DebugString();
}
inline OpaqueType::OpaqueType(OptionalType type)
: OpaqueType(std::move(type.opaque_)) {}
inline OpaqueType& OpaqueType::operator=(OptionalType type) {
return *this = std::move(type.opaque_);
}
template <typename T>
inline std::enable_if_t<std::is_same_v<OptionalType, T>,
absl::optional<OptionalType>>
OpaqueType::As() const {
return AsOptional();
}
template <typename T>
inline std::enable_if_t<std::is_same_v<OptionalType, T>, OptionalType>
OpaqueType::Get() const {
return GetOptional();
}
} // namespace cel
#endif // THIRD_PARTY_CEL_CPP_COMMON_TYPES_OPTIONAL_TYPE_H_