std::equal_range
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Defined in header <algorithm>
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template< class ForwardIt, class T > std::pair<ForwardIt,ForwardIt> |
(1) | |
template< class ForwardIt, class T, class Compare > std::pair<ForwardIt,ForwardIt> |
(2) | |
value
で[first, last)
に等しいすべての要素を含む範囲を返します。範囲は2つのイテレータ、value
より小さくない'で、もう一つは、最初の要素大きいvalue
以上を指す最初の要素を指す1で定義されています。 lower_bound()
と.. - 最初の反復子は、あるいはupper_bound()
、二回目で取得することができるvalue
in the sorted range [first, last)
. The range is defined by two iterators, one pointing to the first element that is not less than value
and another pointing to the first element greater than value
. The first iterator may be alternatively obtained with lower_bound()
, the second - with upper_bound()
.You can help to correct and verify the translation. Click here for instructions.
comp
を使用しています.comp
.You can help to correct and verify the translation. Click here for instructions.
目次 |
[編集] パラメータ
first, last | - | 検討する要素の範囲
Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
value | - | に要素を比較する値
Original: value to compare the elements to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
comp | - | comparison function which returns true if the first argument is less than the second. The signature of the comparison function should be equivalent to the following: bool cmp(const Type1 &a, const Type2 &b); The signature does not need to have const &, but the function must not modify the objects passed to it. |
Type requirements | ||
-ForwardIt must meet the requirements of ForwardIterator .
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[編集] 値を返します
value
未満と最初の要素を指す第2の第1の要素を指す第一を含むvalue
より大きい. value
and the second pointing to the first element greater than value
. You can help to correct and verify the translation. Click here for instructions.
value
下回らないが存在しない場合は、last
は、最初の要素として返されます。同様に要素がない場合は大きいよりvalue
、last
番目の要素として返されますvalue
, last
is returned as the first element. Similarly if there are no elements greater than value
, last
is returned as the second elementYou can help to correct and verify the translation. Click here for instructions.
[編集] 複雑
first
last
との間の距離の対数first
and last
You 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 ForwardIt, class T std::pair<ForwardIt,ForwardIt> equal_range(ForwardIt first, ForwardIt last, const T& value) { return std::make_pair(std::lower_bound(first, last, value), std::upper_bound(first, last, value)); } |
Second version |
template<class ForwardIt, class T, class Compare> std::pair<ForwardIt,ForwardIt> equal_range(ForwardIt first, ForwardIt last, const T& value, Compare comp); { return std::make_pair(std::lower_bound(first, last, value, comp), std::upper_bound(first, last, value, comp)); } |
[編集] 例
#include <algorithm> #include <vector> #include <iostream> struct S { int number; char name; S ( int number, char name ) : number ( number ), name ( name ) {} // only the number is relevant with this comparison bool operator< ( const S& s ) const { return number < s.number; } }; int main() { std::vector<S> vec = { {1,'A'}, {2,'B'}, {2,'C'}, {2,'D'}, {3,'F'}, {4,'G'} }; S value ( 2, '?' ); auto p = std::equal_range(vec.begin(),vec.end(),value); for ( auto i = p.first; i != p.second; ++i ) std::cout << i->name << ' '; }
Output:
B C D
[編集] も参照してください
最初の要素を指すイテレータを返す指定した値より小さくない Original: returns an iterator to the first element not less than the given 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) | |
最初の要素を指すイテレータを返す特定の値より大きい Original: returns an iterator to the first element greater than a certain 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) | |
要素が一定の範囲内に存在するかどうかを決定します Original: determines if an element exists in a certain range 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) |