std::upper_bound
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| Definido no cabeçalho <algorithm>
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| template< class ForwardIt, class T > ForwardIt upper_bound( ForwardIt first, ForwardIt last, const T& value ); |
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| template< class ForwardIt, class T, class Compare > ForwardIt upper_bound( ForwardIt first, ForwardIt last, const T& value, Compare comp ); |
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Retorna um iterador apontando para o primeiro elemento na
[first, last) intervalo que é maior do que value. A primeira versão utiliza operator< para comparar os elementos, a segunda versão utiliza a função de comparação dada comp.Original:
Returns an iterator pointing to the first element in the range
[first, last) that is greater than value. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.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.
Índice |
[editar] Parâmetros
| first, last | - | a gama de elementos para examinar
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 | - | valor a comparar os elementos de
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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[editar] Valor de retorno
iterador apontando para o primeiro elemento que é maior do que
value, ou last se nenhum elemento for encontrado.Original:
iterator pointing to the first element that is greater than
value, or last if no such element is found.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.
[editar] Possível implementação
| First version |
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template<class ForwardIt, class T> ForwardIt upper_bound(ForwardIt first, ForwardIt last, const T& value) { ForwardIt it; std::iterator_traits<ForwardIt>::distance_type count, step; count = std::distance(first,last); while (count > 0) { it = first; step = count / 2; std::advance(it, step); if (!(value < *it)) { first = ++it; count -= step + 1; } else count = step; } return first; } |
| Second version |
template<class ForwardIt, class T, class Compare> ForwardIt upper_bound(ForwardIt first, ForwardIt last, const T& value, Compare comp) { ForwardIt it; std::iterator_traits<ForwardIt>::distance_type count, step; count = std::distance(first,last); while (count > 0) { it = first; step = count / 2; std::advance(it, step); if (!comp(value, *it)), first = ++it; count -= step + 1 } else count = step; } return first; } |
[editar] Exemplo
#include <algorithm> #include <iostream> #include <iterator> #include <vector> int main() { std::vector<int> data = { 1, 1, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6 }; auto lower = std::lower_bound(data.begin(), data.end(), 4); auto upper = std::upper_bound(data.begin(), data.end(), 4); std::copy(lower, upper, std::ostream_iterator<int>(std::cout, " ")); }
Saída:
4 4 4
[editar] Complexidade
logarítmica na distância entre
first e lastOriginal:
logarithmic in the distance between
first and lastThe 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.
[editar] Veja também
| retorna a escala de elementos que combinam com uma tecla específica Original: returns range of elements matching a specific key The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
| retorna um iterador para o primeiro elemento não menos do que o valor dado 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. (modelo de função) | |
