Why use namespaces in c

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. Zero initialization. Copy initialization. Direct initialization. Aggregate initialization. Constant initialization. Reference initialization. Value categories. Order of evaluation. Sign me up! Skip to content. About Post index Higher-level C Project Namespaces in C Posted on January 24, by ejrh. Reified namespaces with structs Can we separate the namespace from the name by something more tangible than a few characters?

Efficiency considerations Using the first implementation of a namespace, as a static variable in a header file, means that each compilation unit that includes that header gets its own private copy. Like this: Like Loading This entry was posted in Higher-level C and tagged c , namespace , struct. Bookmark the permalink. June 2, at pm. June 10, at am. June 10, at pm. May 21, at am. Danny Chung says:. May 11, at pm. Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:.

Email required Address never made public. Name required. Search for:. Blog Stats , hits Email Subscription Enter your email address to subscribe to this blog and receive notifications of new posts by email. Join 64 other followers. The separate parts of a namespace can be spread over multiple files.

So, if one part of the namespace requires a name defined in another file, that name must still be declared. Previous Page. Next Page. Live Demo. 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.

All identifiers at namespace scope are visible to one another without qualification. Code in header files should always use the fully qualified namespace name. The following example shows a namespace declaration and three ways that code outside the namespace can accesses their members. The using directive allows all the names in a namespace to be used without the namespace-name as an explicit qualifier.

Use a using directive in an implementation file i. If a local variable has the same name as a namespace variable, the namespace variable is hidden.

It is an error to have a namespace variable with the same name as a global variable. A using directive can be placed at the top of a. Always use fully qualified names in a header file. If those names get too long, you can use a namespace alias to shorten them. See below. Typically, you declare a namespace in a header file. If your function implementations are in a separate file, then qualify the function names, as in this example.