Namespaces

Warning

This is a more complex topic that can be skipped over for the first time you learn a programming language. It becomes important if you’re learning the historical trend of how unmanaged languages are designed which includes especially C, C++, Rust…

Namespaces prevent naming conflict and they categorize different and names (synonymously labels, or identifiers).

We generalize variables to introduce the term identifiers. A variable is a type of identifier. An identifier syntactic form of a name of a code element like function, variables, classes… In C++ variables without a specified namespace is inside the global namespace. Standard C does use the term “namespace” but it is a different meaning than C++; namespace in C is just a categorization of identifier while C++ namespaces can group any identifiers together in a way that a programmer define instead of as mechanic of the compiler.

Importance

The concept of name management is important in any programming language to prevent conflict and categorize identifiers. In C++ specifically, we manage this through namespaces as the important mechanic where the programmer can group identifiers by themselves. Other more recently made programming languages like Rust, Python, and JavaScript uses modules. Modules file-scopes identifiers.

Related

A related concept is called scope which in many programming languages work in tandem with namespaces to handle identification (looking up things by name).