C++ Namespaces

In C++, a namespace is a way to group related identifiers, such as classes, functions, and variables, under a common name prefix to avoid naming conflicts.

To define a namespace, use the namespace keyword followed by the namespace name and the set of identifiers to include within the namespace:

namespace my_namespace {
  // declarations and definitions here

To use a namespace, either qualify the name of the identifier with the namespace name or bring it into scope with a using declaration:

my_namespace::my_function();  // using the qualified name

using my_namespace::my_function;  // using a using declaration
my_function();  // using the unqualified name

Namespaces are important for avoiding naming conflicts between different parts of your code, as well as for organizing your code into logical modules.

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