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Does a C++ namespace alias defined inside a function definition have a block, function, file, or other scope (duration of validity)?
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A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.
namespace alias definition Namespace aliases allow the programmer to define an alternate name for a namespace. They are commonly used as a convenient shortcut for long or deeply-nested namespaces.
You can also create an alias for a namespace or a type with a using alias directive.
Advantages of namespace In one program, namespace can help define different scopes to provide scope to different identifiers declared within them. By using namespace - the same variable names may be reused in a different program.
It's a block duration of validity. E.g If you define a namespace alias as below, the namespace alias abc would be invalid outside {...} block.
{
namespace abc = xyz;
abc::test t; //valid
}
abc::test t; //invalid
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