Difference between revisions of "cpp/keyword/typename"
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| − | {{cpp/keyword/title|typename}} | + | {{cpp/keyword/title|{{tt|typename}}}} |
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===Usage=== | ===Usage=== | ||
| − | * In the template parameter list of a [[cpp/language/templates|template declaration]], {{c|typename}} can be used as an alternative to {{lt|cpp/keyword/class}} to declare {{lsd|cpp/language/template parameters#Type template parameter}}s {{rev inl|since=c++17|and template template parameters}}. | + | * In the template parameter list of a [[cpp/language/templates|template declaration]], {{c|typename}} can be used as an alternative to {{lt|cpp/keyword/class}} to declare {{lsd|cpp/language/template parameters#Type template parameter}}s{{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 qualified 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. | ||
| − | * | + | * {{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 | + | {{rrev|since=c++20| |
| + | * Inside a [[cpp/language/constraints|requirements]] for type requirements | ||
| + | }} | ||
===See also=== | ===See also=== | ||
| − | * | + | * {{rlpt|class}} |
| − | * | + | * {{rlpt|template}} |
| − | {{ | + | {{rrev|since=c++20| |
| − | + | * {{rlpt|concept}}, {{rlpt|requires}} | |
| − | * | + | |
}} | }} | ||
| − | |||
{{langlinks|de|es|fr|it|ja|pt|ru|zh}} | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Latest revision as of 04:44, 14 August 2024
[edit] Usage
- In the template parameter list of 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.
- typename can be used before a non-dependent qualified type name. It has no effect in this case.
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(since C++20) |
[edit] See also
| (since C++20) |
