std::back_inserter

 

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定義於標頭檔案 <iterator>
template< class Container > std::back_insert_iterator<Container> back_inserter( Container& c );		(C++20 起為 constexpr)

back_inserter 是一個便捷函式模板，它為容器 c 構造一個 std::back_insert_iterator，其型別從引數型別中推導。

引數

c

-

支援 push_back 操作的容器

返回值

一個 std::back_insert_iterator，可用於向容器 c 的末尾新增元素。

可能的實現

template<class Container> std::back_insert_iterator<Container> back_inserter(Container& c) { return std::back_insert_iterator<Container>(c); }

示例

執行此程式碼

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
    std::vector<int> v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::fill_n(std::back_inserter(v), 3, -1);
    for (int n : v)
        std::cout << n << ' ';
    std::cout << '\n';
}

輸出

1 2 3 4 5 6 7 8 9 10 -1 -1 -1

參閱

back_insert_iterator	用於在容器末尾插入的迭代器介面卡 (類模板)
front_inserter	建立從引數推斷型別的std::front_insert_iterator (函式模板)
inserter	建立從引數推斷型別的std::insert_iterator (函式模板)