1 /* 2 * Copyright (c) Facebook, Inc. and its affiliates. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #if defined(__has_include) && __cplusplus >= 201703L 20 21 #if __has_include(<memory_resource>) 22 23 #define FOLLY_HAS_MEMORY_RESOURCE 1 24 #include <memory_resource> // @manual 25 namespace folly { 26 namespace detail { 27 namespace std_pmr = ::std::pmr; 28 } // namespace detail 29 } // namespace folly 30 31 // Ignore experimental/memory_resource for libc++ so that all programs 32 // don't need to explicitly link the c++experimental lib 33 #elif !defined(_LIBCPP_VERSION) && __has_include(<experimental/memory_resource>) 34 35 #define FOLLY_HAS_MEMORY_RESOURCE 1 36 #include <experimental/memory_resource> // @manual 37 namespace folly { 38 namespace detail { 39 namespace std_pmr = ::std::experimental::pmr; 40 } // namespace detail 41 } // namespace folly 42 43 #else 44 45 #define FOLLY_HAS_MEMORY_RESOURCE 0 46 47 #endif 48 49 #else // __has_include 50 51 #define FOLLY_HAS_MEMORY_RESOURCE 0 52 53 #endif // __has_include 54