Support __has_cpp_attribute expressions (C++20) #2376
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* https://clang.llvm.org/docs/LanguageExtensions.html ``` #define __has_builtin(x) 0 #define __has_feature(x) 0 #define __has_extension(x) 0 #define __has_cpp_attribute(x) 0 #define __has_c_attribute(x) 0 #define __has_attribute(x) 0 #define __has_declspec_attribute(x) 0 #define __is_identifier(x) 1 #define __has_warning(x) 0 ``` * close SonarOpenCommunity#2395 * close SonarOpenCommunity#2376 * close SonarOpenCommunity#2369
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* https://clang.llvm.org/docs/LanguageExtensions.html ``` #define __has_builtin(x) 0 #define __has_feature(x) 0 #define __has_extension(x) 0 #define __has_cpp_attribute(x) 0 #define __has_c_attribute(x) 0 #define __has_attribute(x) 0 #define __has_declspec_attribute(x) 0 #define __is_identifier(x) 1 #define __has_warning(x) 0 ``` * close SonarOpenCommunity#2395 * close SonarOpenCommunity#2376 * close SonarOpenCommunity#2369
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* https://clang.llvm.org/docs/LanguageExtensions.html ``` #define __has_builtin(x) 0 #define __has_feature(x) 0 #define __has_extension(x) 0 #define __has_cpp_attribute(x) 0 #define __has_c_attribute(x) 0 #define __has_attribute(x) 0 #define __has_declspec_attribute(x) 0 #define __is_identifier(x) 1 #define __has_warning(x) 0 ``` * close SonarOpenCommunity#2395 * close SonarOpenCommunity#2376 * close SonarOpenCommunity#2369
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(since C++20) __has_cpp_attribute expressions, which detects whether a given attribute token is supported and its supported version.
https://en.cppreference.com/w/cpp/preprocessor/conditional
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