C++ 工程实践(1)：慎用匿名 namespace 匿名 namespace (anonymous namespace 或称 unnamed namespace) 是 C++ 的一项非常有用的功能，其主要目的是让该 namespace 中的成员（变量或函数）具有独一无二的全局名称，避免名字碰撞 (name collisions)。一般在编写 .cpp 文件时，如果需要写一些小的 helper 函数，我们常常会放到匿名 namespace 里。muduo 0.1.7 中的 muduo/base/Date.cc 和 muduo/base/Thread.cc 等处就用到了匿名 namespace-C++ Engineering Practice (1): caution anonymous namespace anonymous namespace (anonymous namespace or call unnamed namespace) is a C++, a very useful function, and its main purpose is to allow the namespace of the member (variable or function) has a unique global name, to avoid name collisions (name collisions). General in the preparation. Cpp file, if you need to write some small helper functions, we often put in anonymous namespace. muduo 0.1.7 The muduo/base/Date.cc and muduo/base/Thread.cc to use an anonymous namespace, etc.