Programming Tutorials

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typedef in C++

By: Stanley B. in C++ Tutorials on 2011年02月19日 [フレーム]

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




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