std::replace, std::replace_if
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Defined in header <algorithm> | ||
template<class ForwardIt, class T > void replace( ForwardIt first, ForwardIt last, | (1) | |
template<class ForwardIt, class UnaryPredicate, class T > void replace_if( ForwardIt first, ForwardIt last, | (2) | |
レンジ
new_valueで[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. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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 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. |
| 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 | ||
-ForwardIt は ForwardIteratorの要求を満足しなければなりません。 | ||
[編集]値を返します
(なし)
[編集]複雑性
述語の正確
last - firstアプリケーション.Original:
Exactly
last - first applications of the predicate.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[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]例
最初は次のコードでは整数のベクトルで8と88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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
このコードを実行します
#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';}
出力:
5 7 4 2 88 6 1 9 0 3 5 7 55 55 99 6 55 9 55 55
[編集]参照
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 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) | |
