Code::Blocks 12.11 error: ‘nullptr’ was not declared in this scope&GNU GCC -std=gnu++0x



Code::Blocks 12.11 error: ‘nullptr’ was not declared in this scope&GNU GCC -std=gnu++0x

Aleeee's blog

 

C++primer英文版（第五版）p54 Null Pointers章节：Modern C++ programs generally should avoid using NULL and use nullptr instead.本人通俗理解为指针初始化尽量用nullptr而避免用NULL。于是乎用Code::Blocks敲敲代码，问题来了。

error: ‘nullptr’ was not declared in this scope

于是网上Google答案，一大堆英文，最后大概了解到是GNU GCC编译器的问题，而不是Code::Blocks这个IDE问题，只需要在编译器里敲入命令行-std=gnu++0x。解决方法：Code::Blocks集成了GNU GCC编译器，所以 菜单栏->Setting->compiler…，选择Global compiler settings页面，页面上部selected compiler选择GNU GCC Comiler，然后页面选择中部选择Compiler settings->Compiler
Flags，勾选Have g++ follow the coming C++0x ISO C++ language standard [-std=gnu++0x

好了，接下来再编译就成功啦！O(∩_∩)O~