front_inserter.md

front_inserter

• iterator[meta header]
• std[meta namespace]
• function template[meta id-type]

namespace std {
  template <class Container>
  front_insert_iterator<Container> front_inserter(Container& x);           // (1) C++03

  template <class Container>
  constexpr front_insert_iterator<Container> front_inserter(Container& x); // (1) C++20
}

• front_insert_iterator[link front_insert_iterator.md]

概要

front_insert_iteratorのヘルパ関数。

戻り値

front_insert_iterator<Container>(x)

• front_insert_iterator[link front_insert_iterator.md]

例

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

int main()
{
  std::deque<int> src = {1, 2, 3};
  std::deque<int> dest;

  // srcの要素をdestの先頭に追加しながらコピー
  std::copy(src.begin(), src.end(), std::front_inserter(dest));

  for (int x : dest) {
    std::cout << x << std::endl;
  }
}

• std::front_inserter[color ff0000]
• std::deque[link /reference/deque/deque.md]
• src.begin()[link /reference/deque/deque/begin.md]
• src.end()[link /reference/deque/deque/end.md]

出力

3
2
1

参照

• P1032R1 Misc constexpr bits