About typedef

最新推荐文章于 2022-08-12 16:04:39 发布

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最新推荐文章于 2022-08-12 16:04:39 发布

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博客介绍了typedef，它可定义类型同义词，定义以typedef关键字开头，后跟数据类型和标识符，该标识符并非引入新类型，而是现有类型的同义词，可在类型名能出现的任何地方使用。还说明了typedef常用于隐藏类型实现、简化复杂类型定义、让单一类型用于多目的并明确用途。

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Typedef Names

A typedef lets us define a synonym for a type:

     typedef double wages;       //  wages is a synonym for double
     typedef int exam_score;     //  exam_score is a synonym for int
     typedef wages salary;       //  indirect synonym for double

A typedef name can be used as a type specifier:

     wages hourly, weekly;     // double hourly, weekly;
     exam_score test_result;   // int test_result;

A typedef definition begins with the keyword typedef, followed by the data type and identifier. The identifier, or typedef name, does not introduce a new type but rather a synonym for the existing data type. A typedef name can appear anywhere in a program that a type name can appear.

Typedefs are commonly used for one of three purposes:

To hide the implementation of a given type and emphasize instead the purpose for which the type is used
To streamline complex type definitions, making them easier to understand
To allow a single type to be used for more than one purpose while making the purpose clear each time the type is used