Can you have a namespace inside a class?
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 . cpp file (at file scope), or inside a class or function definition.
Can you use 2 namespaces?
You can have the same name defined in two different namespaces, but if that is true, then you can only use one of those namespaces at a time. However, this does not mean you cannot use the two namespace in the same program. You can use them each at different times in the same program.
Are classes namespaces C++?
Difference between namespace and class in C++ The namespace and classes are two different concepts. Classes are datatypes. Classes are basically extended version of structures. Classes can contain data members and functions as members, but namespaces can contain variables and functions by grouping them into one.
What is namespace in C sharp?
The namespace keyword is used to declare a scope that contains a set of related objects. You can use a namespace to organize code elements and to create globally unique types. C# Copy.
What does std :: mean in C?
It is known that “std” (abbreviation for the standard) is a namespace whose members are used in the program. So the members of the “std” namespace are cout, cin, endl, etc. This namespace is present in the iostream. h header file.
What namespaces Does C support?
The four namespaces are:
- Tags for a struct/union/enum.
- Members of struct/union (actually a separate namespace is assigned to each struct/union )
- Ordinary identifiers (termed objects in the C standard)
What happens when two namespaces have the same name explain with code?
– A conceptual space for grouping identifiers, classes etc. for the purpose of avoiding conflicts with the elements of an unrelated code which have the same names. – When two name spaces are having same name, the corresponding compiler uses our name spaces instead of the type.
Are namespaces like libraries?
Namespaces provide a notional separation for classes, class libraries provide a physical separation (in windows think a standalone dll). Class libraries are useful for when you want to wrap up functionality that can be shared with other projects.