What does namespace mean in c++

In C, namespace is a mechanism used to organize and encapsulate related code. Its main function is to avoid symbol conflicts: symbols with the same name in different namespaces will not conflict. Organize code: Organize related code into a namespace to improve readability and maintainability. Control access permissions: Control access permissions to symbols in the namespace. Usage: Use namespace namespace_name { // related code } to create a namespace. Use namespace_name::symbol_name to access symbols in namespace

The meaning of namespace in C

In C, Namespace is a mechanism for organizing and encapsulating related classes, functions and variables. Its main purpose is to avoid symbol conflicts and improve code readability and maintainability.

Function

• Avoid symbol conflicts: Same name symbols (such as class names, function names, etc.) in different namespaces will not conflict.
• Organize code: Organize related code into a namespace to facilitate understanding and maintaining the code structure.
• Control access permissions:You can control access permissions to the symbols in it through namespace. For example, only specific code blocks are allowed to access certain symbols.

Usage

To use namespace, you need to use the following syntax:

<code class="cpp">namespace namespace_name {
  // 相关代码
}</code>

Among them, namespace_name is namespace The name.

To access symbols in the namespace, you can use the following syntax:

<code class="cpp">namespace_name::symbol_name</code>

Where, symbol_name is the symbol to be accessed in the namespace.

Example

Here is a simple example showing how namespace is used:

<code class="cpp">// 创建名为 "math" 的namespace
namespace math {

  // 定义一个类
  class Vector {
    // ...
  };

  // 定义一个函数
  double distance(const Vector& v1, const Vector& v2);

} // namespace math

// 使用namespace中的类和函数
math::Vector v1, v2;
double distance = math::distance(v1, v2);</code>

In this example, math Namespace classes and functions can be accessed directly through the math:: prefix without conflicting with symbols in other namespaces or global scopes.

The above is the detailed content of What does namespace mean in c++. For more information, please follow other related articles on the PHP Chinese website!