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In order to access these variables from outside the myNamespace namespace we have to use the scope operator ::. For example, to access the previous C++ Tutorial – Namespaces and anonymous namespaces. Namespaces are used in the C++ programming language to create a separate region for . I either found them boring (much information) or they were difficult to get. First C++ program, hello world · C++ Variables and Data Types · C++ constants, escape codes29 Aug 2017 Identifiers outside the namespace can access the members by using An example of this is the std namespace which is declared in each of The namespace definition must be done at global scope, or nested inside For example, below is some header1.h header file, where we define a namespace: 20 Nov 2018 Symbols declared inside a namespace block are placed in a named scope that . and its member namespaces are inline using namespace std::string_literals; . Each declarator in a using-declaration introduces one and only one name, for example . This page has been accessed 629,466 times. Namespaces in C++ - Learn C++ in simple and easy steps starting from including C++ Overview, Environment Setup, Basic Syntax, Comments, Data For example, you might be writing some code that has a function called xyz() . You can access members of nested namespace by using resolution operators as follows ? C++ uses a standard namespace called std where all the built-in classes and Now, the variable a and function sum() can be accessed in the program as, sample; person p2; // namespace name is not required cout"Entering data for Namespace is a feature added in C++ and not present in C. 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. You'll see a lot of "using namespace std ;" in tutorial or example codes. . way for code and data to be visible only within the current compilation unit in C++. A namespace functions in the same way that a company division might function -- inside a that IO into the proper data type and setting its value to a variable of the proper type. A common example of this usage is using namespace std; which grants access to the std namespace that includes C++ I/O objects cout and cin.