问题
I notice that C++'s std namespace is spread across several files (like in vector, string, iostream, etc.). How can I accomplish the same thing in my programs? Do I simply declare the same namespace in each individual header file, so that it's something like:
a.h
namespace something
{
class A {};
}
b.h
#include "a.h"
namespace something
{
class B : public A {};
}
And then in, say, main.cpp, I would just include "b.h" and "a.h" and then using namespace something; to use the two classes?
回答1:
Yes, that is exactly how to do it.
来源：https://stackoverflow.com/questions/4637811/how-to-use-namespace-across-several-files