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std::add_const

STD：添加[医]简历，STD：：[医]Const，STD：：[医]易挥发

Defined in header ​​
template< class T > struct add_cv;(1)(since C++11)
template< class T > struct add_const;(2)(since C++11)
template< class T > struct add_volatile;(3)(since C++11)

提供成员类型胡枝子f。type这和T，但它的cv-限定符添加%28，除非T是一个函数，一个引用，或者已经有这个cv-限定符%29.

1%29加两者const和volatile...

2%29加const...

3%29加volatile...

成员类型

NameDefinition
typethe type T with the cv-qualifier

帮助者类型

template< class T > using add_cv_t = typename add_cv::type;​(since C++14)
template< class T > using add_const_t = typename add_const<T>::type;​(since C++14)
template< class T > using add_volatile_t = typename add_volatile<T>::type;​(since C++14)

可能的实施

模板<class T>结构添加[医]CV<class T>结构添加[医]模板<class T>结构添加[医]易挥发的{tyduf挥发性T型；}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
struct foo
{
    void m() { std::cout << "Non-cv\n"; }
    void m() const { std::cout << "Const\n"; }
};
 
template <class T>
void call_m()
{
    T().m(
}
 
int main()
{
    call_m<foo>(
    call_m<std::add_const<foo>::type>(
}

二次

产出：

二次

Non-cv
Const

二次

另见

is_const (C++11)checks if a type is const-qualified (class template)
is_volatile (C++11)checks if a type is volatile-qualified (class template)
remove_cvremove_constremove_volatile (C++11)(C++11)(C++11)removes const or/and volatile specifiers from the given type (class template)
as_const (C++17)obtains a reference to const to its argument (function template)

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/type/add[医]CV

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