Difference between revisions of "cpp/keyword/typename"
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* In a [[cpp/language/templates | template declaration]], {{c|typename}} can be used as an alternative to [[cpp/keyword/class | class]] to declare [[cpp/language/template_parameters#Type template parameter|type template parameters]] {{rev inl|since=c++17|and template template parameters}}. | * In a [[cpp/language/templates | template declaration]], {{c|typename}} can be used as an alternative to [[cpp/keyword/class | class]] to declare [[cpp/language/template_parameters#Type template parameter|type template parameters]] {{rev inl|since=c++17|and template template parameters}}. | ||
| − | * Inside a declaration or a definition of a template, {{c|typename}} can be used to declare that a [[cpp/language/dependent_name|dependent name]] is a type. | + | * Inside a declaration or a definition of a template, {{c|typename}} can be used to declare that a [[cpp/language/dependent_name|dependent qualified name]] is a type. |
| + | * {{rev inl|until=c++11|Inside a declaration or a definition of a template,}} {{c|typename}} can be used before a non-dependent qualified type name. It has no effect in this case. | ||
* Inside a [[cpp/language/constraints | requirements]] for type requirements {{mark since c++20}} | * Inside a [[cpp/language/constraints | requirements]] for type requirements {{mark since c++20}} | ||
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Revision as of 00:15, 21 April 2019
Usage
- In a template declaration, typename can be used as an alternative to class to declare type template parameters and template template parameters(since C++17).
- Inside a declaration or a definition of a template, typename can be used to declare that a dependent qualified name is a type.
- Inside a declaration or a definition of a template,(until C++11) typename can be used before a non-dependent qualified type name. It has no effect in this case.
- Inside a requirements for type requirements (since C++20)
