1 // Copyright (C) 2019 Google LLC 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 // Define macros to indicate C++ standard / platform / etc we use. 16 17 #ifndef ICING_TEXT_CLASSIFIER_LIB3_UTILS_BASE_CONFIG_H_ 18 #define ICING_TEXT_CLASSIFIER_LIB3_UTILS_BASE_CONFIG_H_ 19 20 namespace libtextclassifier3 { 21 22 // Define LANG_CXX11 to 1 if current compiler supports C++11. 23 // 24 // GXX_EXPERIMENTAL_CXX0X is defined by gcc and clang up to at least 25 // gcc-4.7 and clang-3.1 (2011-12-13). __cplusplus was defined to 1 26 // in gcc before 4.7 (Crosstool 16) and clang before 3.1, but is 27 // defined according to the language version in effect thereafter. 28 // Microsoft Visual Studio 14 (2015) sets __cplusplus==199711 despite 29 // reasonably good C++11 support, so we set LANG_CXX for it and 30 // newer versions (_MSC_VER >= 1900). 31 #if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \ 32 (defined(_MSC_VER) && _MSC_VER >= 1900)) 33 // Define this to 1 if the code is compiled in C++11 mode; leave it 34 // undefined otherwise. Do NOT define it to 0 -- that causes 35 // '#ifdef LANG_CXX11' to behave differently from '#if LANG_CXX11'. 36 #define LANG_CXX11 1 37 #endif 38 39 } // namespace libtextclassifier3 40 41 #endif // ICING_TEXT_CLASSIFIER_LIB3_UTILS_BASE_CONFIG_H_ 42