1 // Copyright 2024 gRPC authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef GRPC_SRC_CORE_LIB_GPRPP_DOWN_CAST_H 16 #define GRPC_SRC_CORE_LIB_GPRPP_DOWN_CAST_H 17 18 #include <grpc/support/port_platform.h> 19 20 #include <type_traits> 21 22 #include "absl/base/config.h" 23 24 #include <grpc/support/log.h> 25 26 namespace grpc_core { 27 28 template <typename To, typename From> DownCast(From * f)29inline To DownCast(From* f) { 30 static_assert( 31 std::is_base_of<From, typename std::remove_pointer<To>::type>::value, 32 "DownCast requires a base-to-derived relationship"); 33 // If we have RTTI & we're in debug, assert that the cast is legal. 34 #if ABSL_INTERNAL_HAS_RTTI 35 #ifndef NDEBUG 36 if (f != nullptr) GPR_ASSERT(dynamic_cast<To>(f) != nullptr); 37 #endif 38 #endif 39 return static_cast<To>(f); 40 } 41 42 template <typename To, typename From> DownCast(From & f)43inline To DownCast(From& f) { 44 return *DownCast<typename std::remove_reference<To>::type*>(&f); 45 } 46 47 } // namespace grpc_core 48 49 #endif // GRPC_SRC_CORE_LIB_GPRPP_DOWN_CAST_H 50