C + + namespaces

namespaces : Functions, classes, variables, etc. that distinguish the same names in different libraries as additional information, define the context, define the scope;

namespace name{...} Definition of namespaces

Name:: Code; Calls a function or variable with a namespace code

The using namespace directive tells the compiler that subsequent code uses the name in the specified namespace

disjoint namespaces :

A namespace consists of several individually defined parts that can be scattered across multiple files;

A part of the namespace is in a separate file, you need to declare the name;

You can define a new namespace, or you can add new elements of an existing namespace;

　　

nested namespaces :

Another namespace can be defined in one namespace;

Namespace name1

{

Namespace Name2

{

}

}

To access members in a nested namespace by :: operator:

Using namespace name1:: name2; If you use a slow look at 1, the elements in namespace 2 are also available;

C + + namespaces