报错:No template named 'unary_function' in namespace 'std'; did you mean '__unary_function'? 

解决:

Xcode点击Pods点击Build Settings点击 Basic找到Apple Clang-Preprocessing下的Preprocessor Macros 

添加:_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION

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