std::replace_copy, std::replace_copy_if

Defined in header `<algorithm>`

template< class InputIt, class OutputIt, class T > OutputIt replace_copy( InputIt first, InputIt last, OutputIt d_first, const T& old_value, const T& new_value );	(1)

template< class InputIt, class OutputIt, class UnaryPredicate, class T > OutputIt replace_copy_if( InputIt first, InputIt last, OutputIt d_first, UnaryPredicate p, const T& new_value );	(2)

Copies the all elements from the range [first, last) to another range beginning at d_first replacing all elements satisfying specific criteria with new_value. The first version replaces the elements that are equal to old_value, the second version replaces elements for which predicate p returns true. The source and destination ranges cannot overlap.

first, last	-	コピーする要素の範囲 Original: the range of elements to copy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
d_first	-	目的の範囲の始まり Original: the beginning of the destination range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
old_value	-	置換する要素の値 Original: the value of elements to replace The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
p	-	unary predicate which returns true 要素の値を交換する必要があります Original: if the element value should be replaced The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. . The signature of the predicate function should be equivalent to the following: bool pred(const Type &a); The signature does not need to have const &, but the function must not modify the objects passed to it. The type Type must be such that an object of type InputIt can be dereferenced and then implicitly converted to Type.
new_value	-	代替品として使用する値 Original: the value to use as replacement The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
型の要件
- `InputIt` は `InputIterator` の要求を満足しなければなりません。
- `OutputIt` は `OutputIterator` の要求を満足しなければなりません。

[編集] 値を返します

コピーされた最後の要素過去の要素を指すイテレータ.

[編集] 複雑

述語の正確last - firstアプリケーション.

[編集] 可能な実装

First version

template<class InputIt, class OutputIt, class T>
OutputIt replace_copy(InputIt first, InputIt last, OutputIt d_first,
                      const T& old_value, const T& new_value)
{
    for (; first != last; ++first) {
        *d_first++ = (*first == old_value) ? new_value : *first;
    }
    return d_first;
}

Second version

template<class InputIt, class OutputIt, 
         class UnaryPredicate, class T>
OutputIt replace_copy_if(InputIt first, InputIt last, OutputIt d_first,
                         UnaryPredicate p, const T& new_value)
{
    for (; first != last; ++first) {
        *d_first++ = (p( *first ) ? new_value : *first;
    }
    return d_first;
}

[編集] 例

The following copy prints a vector, replacing all values over 5 with 99 on the fly.

このコードを実行します

#include <algorithm>
#include <vector>
#include <iostream>
#include <iterator>
#include <functional>
 
int main()
{
    std::vector<int> v{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
    std::replace_copy_if(v.begin(), v.end(),
                         std::ostream_iterator<int>(std::cout, " "),
                         [](int n){return n > 5;}, 99);
    std::cout << '\n';
}

出力:

5 99 4 2 99 99 1 99 0 3

[編集] も参照してください


remove remove_if	特定の条件を満たす要素を削除します Original: removes elements satisfying specific criteria The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート) [edit]

言語
コンセプト
ユーティリティライブラリ
ストリングスライブラリ
コンテナライブラリ
アルゴリズムライブラリ
イテレータライブラリ
ニューメリックスライブラリ
入力/出力ライブラリ
ローカライゼーションライブラリ
正規表現ライブラリ (C++11)
アトミック操作ライブラリ (C++11)
スレッドのサポートライブラリ (C++11)

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