What are some examples of namespaces in C++?

What are some examples of namespaces in C++?

In C++, a namespace is a declarative region that provides a scope to the identifiers inside it. For example, the standard library uses the std namespace.

Can you give me a code example using a namespace?

Sure! Here's a simple example:

#include <iostream>

namespace MyNamespace {
    void greet() {
        std::cout << "Hello from MyNamespace!" << std::endl;
    }
}

int main() {
    MyNamespace::greet();
    return 0;
}

What happens if I don't use a namespace?

If you don't use a namespace, all identifiers are in the global scope, which can lead to name conflicts if different libraries define the same names.

How can I avoid name conflicts when using multiple namespaces?

You can avoid name conflicts by using fully qualified names, like NamespaceName::identifier, or by using using declarations to bring specific identifiers into scope.