std::front_inserter

 

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在标头 <iterator> 定义
template< class Container > std::front_insert_iterator<Container> front_inserter( Container& c );		(C++20 起为 constexpr)

See More

front_inserter 是便利函数模板，为容器 c 构造 std::front_insert_iterator，并拥有从实参类型推导的类型。

参数

c

-

支持 push_front 操作的容器

返回值

能用于向容器 c 开头添加元素的 std::front_insert_iterator。

可能的实现

template<class Container> std::front_insert_iterator<Container> front_inserter( Container& c ) { return std::front_insert_iterator<Container>(c); }

示例

运行此代码

#include <algorithm>
#include <deque>
#include <iostream>
#include <iterator>
#include <vector>

int main()
{
    std::vector<int> v{1, 2, 3, 4, 5};
    std::deque<int> d;
    std::copy(v.begin(), v.end(), std::front_inserter(d));
    for (int n : d)
        std::cout << n << ' ';
    std::cout << '\n';
}

输出：

5 4 3 2 1

参阅

front_insert_iterator	在容器头部插入的迭代器适配器 (类模板)
back_inserter	创建拥有从实参推出的类型的 std::back_insert_iterator (函数模板)
inserter	创建拥有从实参推出的类型的 std::insert_iterator (函数模板)