Usage of typedef in c++

typedef is used to create aliases in C, giving them the following advantages: Improves code readability and maintainability Simplifies type conversions Enforces type safety

Usage of typedef in C

Definition of typedef

typedef is a keyword in C used to create aliases. It allows users to create new names for existing data types or custom data types. The syntax is as follows:

<code class="cpp">typedef <原数据类型> <别名>;</code>

Usage

The usage of typedef includes:

• Improve readability and maintainability: By creating meaningful aliases, you can make your code easier to read and understand. For example, a complex type like unsigned long long int can be renamed to UInt64.
• Simplified type conversion: typedef can simplify code that needs to convert one type to another. For example, you can create an alias for Coordinate that represents a pair<int, int>, allowing you to easily convert Coordinate to pair<int , int>.
• Enforcing type safety: typedef helps enforce type safety because it ensures that only a specific data type can be assigned to a given alias.

Advantages

• Improve code readability
• Simplify type conversion
• Enforce type safety

Examples

Here are some examples of typedefs:

<code class="cpp">// 创建一个 unsigned long long int 的别名
typedef unsigned long long int UInt64;

// 创建一个 pair<int, int> 的别名
typedef pair<int, int> Coordinate;

// 使用别名将一个 UInt64 赋值给变量 u
UInt64 u = 1234567890123456789;

// 使用别名将一个 pair<int, int> 赋值给变量 c
Coordinate c = make_pair(10, 20);</code>

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