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std::includes

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< cpp‎ | algorithm

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C++
 
アルゴリズムライブラリ
機能します
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Functions
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シーケンス動作を非改変
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Non-modifying sequence operations
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シーケンス動作を変更する
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Modifying sequence operations
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操作を仕切る
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Partitioning operations
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（ソートされた範囲で）ソート操作
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Sorting operations (on sorted ranges)
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バイナリ検索操作（ソート範囲で）
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Binary search operations (on sorted ranges)
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（ソートされた範囲で）操作を設定します
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Set operations (on sorted ranges)
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merge
inplace_merge
includes
ヒープ操作
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Heap operations
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最小値/最大値操作
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Minimum/maximum operations
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数値演算
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Numeric operations
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Cライブラリ
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C library
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Defined in header <algorithm>
template< class InputIt1, class InputIt2 >

bool includes( InputIt1 first1, InputIt1 last1,

               InputIt2 first2, InputIt2 last2 );
 (1)
template< class InputIt1, class InputIt2 >

bool includes( InputIt1 first1, InputIt1 last1,

               InputIt2 first2, InputIt2 last2, Compare comp );
 (2)
戻りtrueソート範囲[first2, last2)からすべての要素がソート範囲[first, last)内検出された場合。 true空の場合も[first2, last2)を返します。.
Original:
Returns true if every element from the sorted range [first2, last2) is found within the sorted range [first, last). Also returns true if [first2, last2) is empty.
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最初のバージョンは両方とも範囲はoperator<でソートされることを想定して、2番目のバージョンは、それらが与えられた比較関数compでソートされることを想定してい.
Original:
The first version expects both ranges to be sorted with operator<, the second version expects them to be sorted with the given comparison function comp.
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目次

[編集] パラメータ

first1, last1 -
検討する要素の並べ替えられた範囲
Original:
the sorted range of elements to examine
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first2, last2 -
を検索するための要素の並べ替えられた範囲
Original:
the sorted range of elements to search for
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comp - comparison function which returns ​true if the first argument is less than the second.

The signature of the comparison function should be equivalent to the following:

 bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type InputIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.

[編集] 値を返します

true[first2, last2)からすべての要素が[first, last)のメンバーであるかどうか.
Original:
true if every element from [first2, last2) is a member of [first, last).
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[編集] 複雑

最も2·(N1+N2-1)の比較で、どこN1= std::distance(first1, last1)とN2= std::distance(first2, last2).
Original:
At most 2·(N1+N2-1) comparisons, where N1 = std::distance(first1, last1) and N2 = std::distance(first2, last2).
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[編集] 可能な実装

First version 
template<class InputIt1, class InputIt2>
bool includes(InputIt1 first1, InputIt1 last1,
              InputIt2 first2, InputIt2 last2)
{
    for (; first2 != last2; ++first1)
    {
        if (first1 == last1 || *first2 < *first1)
            return false;
        if ( !(*first1 < *first2) )
            ++first2;
    }
    return true;
}
Second version 
template<class InputIt1, class InputIt2>
bool includes(InputIt1 first1, InputIt1 last1,
              InputIt2 first2, InputIt2 last2, Compare comp)
{
    for (; first2 != last2; ++first1)
    {
        if (first1 == last1 || comp(*first2, *first1))
            return false;
        if (!comp(*first1, *first2))
            ++first2;
    }
    return true;
}

[編集] 例

#include <iostream>
#include <algorithm>
#include <cctype>
 
int main()
{
  std::vector<char> v1 {'a', 'b', 'c', 'f', 'h', 'x'};
  std::vector<char> v2 {'a', 'b', 'c'};
  std::vector<char> v3 {'a', 'c'};
  std::vector<char> v4 {'g'};
  std::vector<char> v5 {'a', 'c', 'g'};
  std::vector<char> v6;
 
  for (auto i : v1) std::cout << i << ' ';
  std::cout << "includes:\n";
 
  for (auto i : v2) std::cout << i << ' ';
  std::cout << ": " << std::includes(v1.begin(), v1.end(), v2.begin(), v2.end()) << '\n';
  for (auto i : v3) std::cout << i << ' ';
  std::cout << ": " << std::includes(v1.begin(), v1.end(), v3.begin(), v3.end()) << '\n';
  for (auto i : v4) std::cout << i << ' ';
  std::cout << ": " << std::includes(v1.begin(), v1.end(), v4.begin(), v4.end()) << '\n';
  for (auto i : v5) std::cout << i << ' ';
  std::cout << ": " << std::includes(v1.begin(), v1.end(), v5.begin(), v5.end()) << '\n';
  for (auto i : v6) std::cout << i << ' ';
  std::cout << ": " << std::includes(v1.begin(), v1.end(), v6.begin(), v6.end()) << '\n';
 
  auto cmp_nocase = [](char a, char b) {
    return std::tolower(a) < std::tolower(b);
  }
  std::vector<char> v7 {'A', 'B', 'C'};
  for (auto i : v7) std::cout << i << ' ';
  std::cout << ": "
            << std::includes(v1.begin(), v1.end(), v7.begin(), v7.end(), cmp_nocase)
            << '\n';
}

Output: 

a b c f h x includes:
a b c : 1
a c : 1
g : 0
a c g : 0
A B C : 1

[編集] も参照してください
二組の差を計算します
Original:
computes the difference between two sets
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(関数テンプレート) [edit]
searches for a range of elements
(関数テンプレート) [edit]
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