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This article mainly introduces "C++ uses template aliases to simplify notation and hide how to achieve". In daily operation, I believe many people have doubts about how C++ uses template aliases to simplify notation and hide how to achieve it. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for everyone to answer the doubt that C++ uses template aliases to simplify notation and hide how to achieve it. Next, please follow the editor to study!

T.42: use template aliases to simplify notation and hide implementation details

Reason (reason)

Improved readability. Implementation hiding. Note that template aliases replace many uses of traits to compute a type. They can also be used to wrap a trait.

Improve readability. Hide the implementation. Note that template aliases replace many of the uses used to calculate type features. They can be used to encapsulate features.

Example (sample)

Template

Class Matrix {

/ /...

Using Iterator = typename std::vector::iterator

/ /...

}

This saves the user of Matrix from having to know that its elements are stored in a vector and also saves the user from repeatedly typing typename std::vector::.

Users of Matrix do not need to know that its elements are stored in vector, and they do not have to type the type name std::vecttor:: repeatedly.

Example (sample)

Template

Void user (T & c)

{

/ /...

Typename container_traits::value_type x; / / bad, verbose

/ /...

}

Template

Using Value_type = typename container_traits::value_type

This saves the user of Value_type from having to know the technique used to implement value_types.

Users of Value_type do not need to know the technology to implement value_type.

Template

Void user2 (T & c)

{

/ /...

Value_type x

/ /...

} Note (note)

A simple, common use could be expressed: "Wrap traits!"

Simple, common usage can be interpreted as "encapsulation feature".

Enforcement (implementation recommendations)

Flag use of typename as a disambiguator outside using declarations.

Marks the use of typename as a disambiguation eliminator outside the using.

At this point, the study of "C++ uses template aliases to simplify notation and hide how to achieve it" is over. I hope I can solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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