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std::remove_extent

性病：移除[医]程度

Defined in header ​​
template< class T > struct remove_extent;​(since C++11)

如果T是某种类型的数组。X，提供成员类型为type等于X，否则type是T注意，如果T是多维数组，则只删除第一个维度。

成员类型

NameDefinition
typethe type of the element of T

帮助者类型

template< class T > using remove_extent_t = typename remove_extent::type;​(since C++14)

可能的实施

模板<class T>结构拆卸[医]范围{tydufT类型；}；模板<class T>结构拆卸[医]程度<T。[]>{tydufT类型；}；模板<class T，std：：size[医]TN>结构删除[医]程度<Tn>{tydufT型；}；

*。

例

二次

#include <iostream>
#include <iterator>
#include <algorithm>
#include <type_traits>
 
template<class A>
typename std::enable_if< std::rank<A>::value == 1 >::type
print_1d(const A& a)
{
    copy(a, a+std::extent<A>::value,
         std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " ")
    std::cout << '\n';
}
 
int main()
{
    int a[][3] = {{1,2,3},{4,5,6}};
//  print_1d(a // compile-time error
    print_1d(a[1]
}

二次

产出：

二次

4 5 6

二次

另见

is_array (C++11)checks if a type is an array type (class template)
rank (C++11)obtains the number of dimensions of an array type (class template)
extent (C++11)obtains the size of an array type along a specified dimension (class template)
remove_all_extents (C++11)removes all extents from the given array type (class template)

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

http：//en.cppreference.com/w/cpp/type/Remove[医]程度

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