Qt下编译报错：error: 'nullptr' was not declared in this scope
问题缘由：这个nullptr并非程序定义的，而是C++11引入的关键字因此这个编译器可能没有支持C++11。c++ 解决办法：使用nullptr时，要添加对C++11的支持，在.pro文件中添加QMAKE_CXXFLAGS += -std=c++0x便可编译器
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