std::adjacent_difference
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Defined in header <numeric>
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template< class InputIt, class OutputIt > OutputIt adjacent_difference( InputIt first, InputIt last, |
(1) | |
template< class InputIt, class OutputIt, class BinaryOperation > OutputIt adjacent_difference( InputIt first, InputIt last, |
(2) | |
[first, last)
の各要素の隣接ペアの最初の違いを計算し、d_first + 1
で範囲の先頭に書き込みます。 first
の未修正のコピーがd_first
に書き込まれます。最初のバージョンの違いを計算するoperator-
使用し、2番目のバージョンは、指定されたバイナリop
機能を使用しています.[first, last)
and writes them to the range beginning at d_first + 1
. Unmodified copy of first
is written to d_first
. The first version uses operator-
to calculate the differences, the second version uses the given binary function op
.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.
*(d_first) = *first; *(d_first+1) = (*first+1) - *(first); *(d_first+2) = (*first+2) - *(first+1); *(d_first+3) = (*first+3) - *(first+2); ...
目次 |
[編集] パラメータ
first, last | - | 要素の範囲
Original: the range of elements 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. |
op | - | binary operation function object that will be applied. The signature of the function should be equivalent to the following: Ret fun(const Type1 &a, const Type2 &b); The signature does not need to have const &. |
Type requirements | ||
-InputIt must meet the requirements of InputIterator .
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-OutputIt must meet the requirements of OutputIterator .
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[編集] 値を返します
You can help to correct and verify the translation. Click here for instructions.
[編集] 複雑
(last - first) - 1
アプリケーション(last - first) - 1
applications of the binary operationYou can help to correct and verify the translation. Click here for instructions.
[編集] 可能な実装
First version |
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template<class InputIt, class OutputIt> OutputIt adjacent_difference(InputIt first, InputIt last, OutputIt d_first) { if (first == last) return d_first; typedef typename std::iterator_traits<InputIt>::value_type value_t; value_t acc = *first; *d_first = acc; while (++first != last) { value_t val = *first; *++d_first = val - acc; acc = std::move(val); } return ++d_first; } |
Second version |
template<class InputIt, class T, class BinaryOperation> OutputIt adjacent_difference(InputIt first, InputIt last, OutputIt d_first, BinaryOperation op) { if (first == last) return d_first; typedef typename std::iterator_traits<InputIt>::value_type value_t; value_t acc = *first; *d_first = acc; while (++first != last) { value_t val = *first; *++d_first = op(val, acc); acc = std::move(val); } return ++d_first; } |
[編集] 例
You can help to correct and verify the translation. Click here for instructions.
#include <numeric> #include <vector> #include <iostream> #include <functional> int main() { std::vector<int> v{2, 4, 6, 8, 10, 12, 14, 16, 18, 20}; std::adjacent_difference(v.begin(), v.end(), v.begin()); for(auto n: v) { std::cout << n << ' '; } std::cout << '\n'; v = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1}; std::adjacent_difference(v.begin(), v.end()-1, v.begin()+1, std::plus<int>() for(auto n: v) { std::cout << n << ' '; } std::cout << '\n'; }
Output:
2 2 2 2 2 2 2 2 2 2 1 1 2 3 5 8 13 21 34 55
[編集] も参照してください
要素の範囲の部分和を計算します Original: computes the partial sum of a range of elements 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) | |
要素の範囲をまとめている Original: sums up a range of elements 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) |