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std::experimental::ranges::mismatch

From cppreference.com
< cpp‎ | experimental‎ | ranges
 
 
 
 
 
template< InputIterator I1, Sentinel<I1> S1, InputIterator I2, Sentinel<I2> S2,

          class Proj1 = ranges::identity, class Proj2 = ranges::identity,
          class Pred = ranges::equal_to<> >
    requires IndirectRelation<Pred, projected<I1, Proj1>, projected<I2, Proj2>>
auto mismatch( I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = Pred{},
               Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} )

    -> ranges::tagged_pair<tag::in1(I1), tag::in2(I2)>;
(1) (ranges TS)
template< InputRange R1, InputRange R2,

          class Proj1 = ranges::identity, class Proj2 = ranges::identity,
          class Pred = ranges::equal_to<> >
    requires IndirectRelation<Pred, projected<ranges::iterator_t<R1>, Proj1>,
                              projected<ranges::iterator_t<R2>, Proj2>>
auto mismatch( R1&& r1, R2&& r2, Pred pred = Pred{},
               Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} )
    -> ranges::tagged_pair<tag::in1(ranges::safe_iterator_t<R1>),

                           tag::in2(ranges::safe_iterator_t<R2>)>;
(2) (ranges TS)
template< InputIterator I1, Sentinel<I1> S1, class I2,

          class Pred  = ranges::equal_to<>,
          class Proj1 = ranges::identity, class Proj2 = ranges::identity >
    requires InputIterator<std::decay_t<I2>> && !Range<I2> &&
             IndirectRelation<Pred, projected<I1, Proj1>,
                                    projected<std::decay_t<I2>, Proj2>>
auto mismatch( I1 first1, S1 last1, I2&& first2_, Pred pred = Pred{},
               Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} )

    -> ranges::tagged_pair<tag::in1(I1), tag::in2(std::decay_t<I2>)>;
(3) (ranges TS)
(非推奨)
template< InputRange R1, class I2, class Pred = ranges::equal_to<>,

          class Proj1 = ranges::identity, class Proj2 = ranges::identity >
    requires InputIterator<std::decay_t<I2>> && !Range<I2> &&
             IndirectRelation<Pred, projected<ranges::iterator_t<R1>, Proj1>,
                                    projected<std::decay_t<I2>, Proj2>>
auto mismatch( R1&& r1, I2&& first2_, Pred pred = Pred{},
               Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} )
    -> ranges::tagged_pair<tag::in1(ranges::safe_iterator_t<Rng1>),

                           tag::in2(std::decay_t<I2>)>;
(4) (ranges TS)
(非推奨)
1) Returns the first mismatching pair of elements from two ranges: one defined by [first1last1) and another defined by [first2last2).
2) Same as (1), but uses r1 as the first source range and r2 as the second source range, as if using ranges::begin(r1) as first1, ranges::end(r1) as last1, ranges::begin(r2) as first2, and ranges::end(r2) as last2.
3) Same as (1), but behaves as if first2 is std::decay_t<I2> first2 = std::forward<I2>(first2_); and last2 is ranges::unreachable{}. The underlying algorithm never increments first2 more than last1 - first1 times.
4) Same as (3), but uses r1 as the first source range, as if using ranges::begin(r1) as first1 and ranges::end(r1) as last1.

Elements are compared using pred to the projected elements of the two ranges, as if by ranges::invoke(pred, ranges::invoke(proj1, *i), ranges::invoke(proj2, *j)).

上記に示された宣言にもかかわらず、アルゴリズム宣言のテンプレートパラメータの実際の数と順序は未指定です。したがって、アルゴリズムを呼び出す際に明示的なテンプレート引数を使用すると、プログラムはおそらくポータブルではありません。

目次

[編集] パラメータ

first1, last1 - the first range of the elements
r1 - the first range of the elements
first2, last2 - the second range of the elements
r2 - the second range of the elements
first2_ - the beginning of the second range of the elements
pred - 射影された要素に適用する述語
proj1 - 最初の範囲の要素に適用する射影
proj2 - 2番目の範囲の要素に適用する射影

[編集] 戻り値

A tagged_pair object with iterators to the first two non-equal elements (the iterator from the first range has the tag in1 and the iterator from the second range has the tag in2).

If no mismatches are found when the comparison reaches last1 or last2, whichever happens first, the pair holds the end iterator and the corresponding iterator from the other range.

[編集] 計算量

At most last1 - first1 applications of the predicate and each projection.

[編集] 実装例

template<InputIterator I1, Sentinel<I1> S1, InputIterator I2, Sentinel<I2> S2,
         class Proj1 = ranges::identity, class Proj2 = ranges::identity,
         class Pred = ranges::equal_to<>>
    requires IndirectRelation<Pred, projected<I1, Proj1>, projected<I2, Proj2>>
auto mismatch(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = Pred{},
              Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{})
    -> ranges::tagged_pair<tag::in1(I1), tag::in2(I2)>
{
    while (first1 != last1 && first2 != last2 &&
           ranges::invoke(pred, ranges::invoke(proj1, *first1),
                                ranges::invoke(proj2, *first2)))
    {
        ++first1;
        ++first2;
    }
    return {first1, first2};
}

[編集]

[編集] 関連項目

2つの範囲が異なる最初の位置を見つける
(関数テンプレート) [編集]
2つの要素の集合が同じかどうかを判断する
(function template) [編集]
特定の基準を満たす最初の要素を見つける
(function template) [編集]
ある範囲が別の範囲より辞書順で小さい場合に true を返す
(function template) [編集]
要素の範囲を検索します。
(function template) [編集]
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