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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.
#ifndef THIRD_PARTY_CEL_CPP_BASE_TYPES_OPTIONAL_TYPE_H_
#define THIRD_PARTY_CEL_CPP_BASE_TYPES_OPTIONAL_TYPE_H_
#include <string>
#include <utility>
#include "absl/log/absl_check.h"
#include "absl/strings/string_view.h"
#include "absl/types/span.h"
#include "base/memory.h"
#include "base/type.h"
#include "base/types/opaque_type.h"
#include "internal/rtti.h"
namespace cel {
class OptionalType final : public OpaqueType {
public:
static bool Is(const Type& type) {
return OpaqueType::Is(type) &&
OpaqueType::TypeId(static_cast<const OpaqueType&>(type)) ==
internal::TypeId<OptionalType>();
}
using OpaqueType::Is;
static const OptionalType& Cast(const Type& type) {
ABSL_DCHECK(Is(type)) << "cannot cast " << type.name() << " to optional";
return static_cast<const OptionalType&>(type);
}
absl::string_view name() const override { return "optional"; }
std::string DebugString() const override;
absl::Span<const Handle<Type>> parameters() const override {
return absl::MakeConstSpan(&type_, 1);
}
const Handle<Type>& type() const { return type_; }
private:
friend class MemoryManager;
// Called by Arena-based memory managers to determine whether we actually need
// our destructor called.
CEL_INTERNAL_IS_DESTRUCTOR_SKIPPABLE() {
return base_internal::Metadata::IsDestructorSkippable(*type());
}
explicit OptionalType(Handle<Type> type) : type_(std::move(type)) {}
internal::TypeInfo TypeId() const override {
return internal::TypeId<OptionalType>();
}
const Handle<Type> type_;
};
extern template class Handle<OptionalType>;
} // namespace cel
#endif // THIRD_PARTY_CEL_CPP_BASE_TYPES_OPTIONAL_TYPE_H_