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50 lines (43 loc) · 1.74 KB
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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_CASTS_H_
#define THIRD_PARTY_CEL_CPP_INTERNAL_CASTS_H_
#include <cassert>
#include <memory>
#include <type_traits>
namespace cel::internal {
template <typename To, typename From>
To down_cast(From* from) {
static_assert(std::is_pointer_v<To>, "Target type not a pointer.");
static_assert((std::is_base_of_v<From, std::remove_pointer_t<To>>),
"Target type not derived from source type.");
#if !defined(__GNUC__) || defined(__GXX_RTTI)
assert(from == nullptr || dynamic_cast<To>(from) != nullptr);
#endif
return static_cast<To>(from);
}
template <typename To, typename From>
To down_cast(From& from) {
static_assert(std::is_lvalue_reference_v<To>,
"Target type not a lvalue reference.");
static_assert((std::is_base_of_v<From, std::remove_reference_t<To>>),
"Target type not derived from source type.");
#if !defined(__GNUC__) || defined(__GXX_RTTI)
assert(dynamic_cast<std::add_pointer_t<std::remove_reference_t<To>>>(
std::addressof(from)) != nullptr);
#endif
return static_cast<To>(from);
}
} // namespace cel::internal
#endif // THIRD_PARTY_CEL_CPP_INTERNAL_CASTS_H_