THINK++ — Engineering Visualized

Organization

C++ Namespaces

Namespaces are used to group entities like classes, objects, and functions under a name. They prevent naming collisions between different libraries.

THE std NAMESPACE

All standard C++ features (cout, cin, vector, etc.) are inside the std namespace.

std::cout << "Hello"; // Full name

using namespace std; // Shortcut (Caution!)
cout << "Hello";

CUSTOM NAMESPACE

namespace MyLib {
    void log(string s) { ... }
}

MyLib::log("Test");

BEST PRACTICE

Avoid using namespace std; in header files or large projects. It can lead to "Namespace Pollution" where names from different libraries clash.

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