名前空間
変種
操作

std::replace, std::replace_if

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< cpp‎ | algorithm

 
 
アルゴリズムライブラリ
機能します
Original:
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)
Original:
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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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 ForwardIt, class T >

void replace( ForwardIt first, ForwardIt last,

              const T& old_value, const T& new_value );
(1)
template< class ForwardIt, class UnaryPredicate, class T >

void replace_if( ForwardIt first, ForwardIt last,

                 UnaryPredicate p, const T& new_value );
(2)
レンジnew_value[first, last)で特定の条件を満たすすべての要素を置き換えます。最初のバージョンはold_valueに等しい要素を置換し、2番目のバージョンでは、要素を置き換えるものの述語p戻りtrue.
Original:
Replaces all elements satisfying specific criteria with new_value in the range [first, last). The first version replaces the elements that are equal to old_value, the second version replaces elements for which predicate p returns true.
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目次

[編集] パラメータ

first, last -
プロセスへの要素の範囲
Original:
the range of elements to process
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old_value -
置換する要素の値
Original:
the value of elements to replace
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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
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.

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 ForwardIt 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
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Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[編集] 値を返します

(なし)
Original:
(none)
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[編集] 複雑

述語の正確last - firstアプリケーション.
Original:
Exactly last - first applications of the predicate.
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[編集] 可能な実装

First version
template<class ForwardIt, class T>
void replace(ForwardIt first, ForwardIt last,
             const T& old_value, const T& new_value)
{
    for (; first != last; ++first) {
        if (*first == old_value) {
            *first = new_value;
        }
    }
}
Second version
template<class ForwardIt, class UnaryPredicate, class T>
void replace_if(ForwardIt first, ForwardIt last,
                UnaryPredicate p, const T& new_value)
{
    for (; first != last; ++first) {
        if(p(*first)) {
            *first = new_value;
        }
    }
}

[編集]

最初は次のコードでは整数のベクトルで888のすべての出現箇所を置換します。それは55と5未満のすべての値を置き換え.
Original:
The following code at first replaces all occurrences of 8 with 88 in a vector of integers. Then it replaces all values less than 5 with 55.
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#include <algorithm>
#include <array>
#include <iostream>
#include <functional>
 
int main()
{
    std::array<int, 10> s{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
 
    std::replace(s.begin(), s.end(), 8, 88);
 
    for (int a : s) {
        std::cout << a << " ";
    }
    std::cout << '\n';
 
    std::replace_if(s.begin(), s.end(), 
                    std::bind(std::less<int>(), std::placeholders::_1, 5), 55);
    for (int a : s) {
        std::cout << a << " ";
    }
    std::cout << '\n';
}

Output:

5 7 4 2 88 6 1 9 0 3
5 7 55 55 99 6 55 9 55 55

[編集] も参照してください

別の値を使用して、特定の条件を満たす要素を置き換えて、範囲をコピーします
Original:
copies a range, replacing elements satisfying specific criteria with another value
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(関数テンプレート) [edit]