define a function within a namespace

Question

namespace n1 {
  namespace n2 {
    ...
    int myfunc(void)
      {
         return 1;
      }
    class myclass {
      ..
    };
  }
}

I thought it is possible to define a function this way, and access it both from 'myclass' and its derivatives. However gcc doesn't even want to compile this code:

multiple definition of `n1::n2::myfunc()'

This function is the only one here, what am I missing? Thanks.

Answer 1

您需要将函数标记为inline以避免破坏一个定义规则，或者将实现放置在.cpp文件中，并且仅将声明保留在标头中。