error C2039: ‘tr1‘: is not a member of ‘std‘

最近在VS2019的工程中集成gtest，发现报错如下：

error C2039: 'tr1': is not a member of 'std'
error C3083: 'tr1': the symbol to the left of a '::' must be a type

原因：可能是C++11新特性导致

解决方案：

在CmakeLists文件中预定义 _HAS_TR1_NAMESPACE 宏，通知编译器支持C++11

add_compile_definitions(_HAS_TR1_NAMESPACE)

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error C2039: ‘tr1‘: is not a member of ‘std‘

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