Why namespaces are used

Definition and Creation: Namespaces allow us to group named entities that otherwise would have global scope into narrower scopes, giving them namespace scope. This allows organizing the elements of programs into different logical scopes referred to by names. A namespace is a declarative region that provides a scope to the identifiers names of the types, function, variables etc inside it.

Multiple namespace blocks with the same name are allowed. All declarations within those blocks are declared in the named scope. Namespace declarations can be nested within another namespace. Public or private No need to give semicolon after the closing brace of definition of namespace. We can split the definition of namespace over several units. I don't know about Java and Dart. Java has packages, those partition names as well — StoryTeller - Unslander Monica. Also: stackoverflow. Can't imagine why you'd want to create a namespace for each class, since the purpose is to logically group classes together.

Show 1 more comment. Active Oldest Votes. So, to some degree, this is a case of… you'll know why you need it, when you need it.

Improve this answer. Add a comment. Jesper Juhl Jesper Juhl Without namespaces, which bind should be called? The compiler has trouble figuring that out.

Qualifying the call to bind with the appropriate namespace solves that. Mike Robinson Mike Robinson 7, 3 3 gold badges 17 17 silver badges 29 29 bronze badges. Simply put, namespaces allow to use the same names for different contexts. The Riser The Riser 3 3 silver badges 11 11 bronze badges. In that example, it would be much preferable to use distinct, self-documenting function names. True, but if you're working on a bigger scale, and you want to easily switch between too large sets of functions, this method may come in handy, it's very specific example but it demonstrates one of the ways you can use namespaces to your advantage.

Sign up or log in Sign up using Google. This is called an unnamed or anonymous namespace and it is useful when you want to make variable declarations invisible to code in other files i. All code in the same file can see the identifiers in an unnamed namespace but the identifiers, along with the namespace itself, are not visible outside that file—or more precisely outside the translation unit. Declarations and Definitions. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

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Class template Function template. Inline assembly. Declarations Overview declaration syntax decl-specifier-seq declarator Specifiers typedef. Its members have potential scope from their point of declaration to the end of the translation unit, and have internal linkage. Run this code. Compiler support. Freestanding and hosted. Language support library. Technical specifications. Flow control. Function declaration. Lambda function declaration. Fundamental types. Function types.

Compound types. Storage duration specifiers. Default initialization. Value initialization.