Quick Answer

Logical grouping of code elements and avoiding naming conflicts

Understanding the Issue

Namespaces provide a way to group related code elements and prevent naming collisions between different libraries or code sections. They are essential for large projects and library development.

The Problem

This code demonstrates the issue:

Cpp Error 
// Problem: Naming collision
void log(string msg); // Your implementation
// Third-party library also has log()

The Solution

Here's the corrected code:

Cpp Fixed 
// Solution: Namespace usage
namespace MyApp {
    void log(string msg) { /*...*/ }
}

// Usage:
MyApp::log("message");
// OR
using MyApp::log;
log("message");

Key Takeaways

Always use namespaces in production code to avoid collisions.