std::minmax - cppreference.com
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| Definido no cabeçalho <algorithm> |
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(1) | (desde C++11) |
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(2) | (desde C++11) |
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(3) | (desde C++11) |
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(4) | (desde C++11) |
1-2)
Retorna o menor e o maior dos dois valores.
Original:
Returns the smaller and the greater of the two values.
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3-4)
Retorna a lista menor e maior dos valores em inicializador ilist.
Original:
Returns the smallest and the greatest of the values in initializer list ilist.
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As versões (1,3) usa operator< para comparar os valores, enquanto que as versões (2,4) utilizar a função de comparação dada comp.
Original:
The (1,3) versions use operator< to compare the values, whereas the (2,4) versions use the given comparison function comp.
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Parâmetros
| a, b | - | os valores para comparar Original: the values to compare The text has been machine-translated via Google Translate. |
| ilist | - | inicializador lista com os valores para comparar Original: initializer list with the values to compare The text has been machine-translated via Google Translate. |
| comp | - | comparison function which returns true if if a is less than b.
The signature of the comparison function should be equivalent to the following:
The signature does not need to have |
| Type requirements | ||
-T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
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-T must meet the requirements of CopyConstructible. for the overloads (3) and (4)
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Valor de retorno
1-2)
Retorna o resultado de se std::make_pair(a, b) a<b ou se a é equivalente a b. Retorna o resultado da std::make_pair(b, a) se b<a.
Original:
Returns the result of std::make_pair(a, b) if a<b or if a is equivalent to b. Returns the result of std::make_pair(b, a) if b<a.
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3-4)
A par com o menor valor na ilist como o primeiro elemento e maior que a segunda. Se vários elementos são equivalentes a menor, o elemento mais à esquerda como é retornado. Se vários elementos são equivalentes ao maior, o elemento mais à direita são devolvidas.
Original:
A pair with the smallest value in ilist as the first element and the greatest as the second. If several elements are equivalent to the smallest, the leftmost such element is returned. If several elements are equivalent to the largest, the rightmost such element is returned.
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Complexidade
1-2)
Constante
Original:
Constant
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3-4)
Linear em ilist.size()
Original:
Linear in ilist.size()
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Possível implementação
| First version |
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template<class T> std::pair<const T&,const T&> minmax(const T& a, const T& b) { return (b < a) ? std::make_pair(b, a) : std::make_pair(a, b); } |
| Second version |
template<class T, class Compare> std::pair<const T&,const T&> minmax(const T& a, const T& b, Compare comp) { return comp(b, a) ? std::make_pair(b, a) : std::make_pair(a, b); } |
| Third version |
template< class T > std::pair<T,T> minmax( std::initializer_list ilist) { auto p = std::minmax_element(ilist.begin(), ilist.end()); return std::make_pair(*p.first, *p.second); } |
| Fourth version |
template< class T, class Compare > std::pair<T,T> minmax( std::initializer_list ilist, Compare comp ) { auto p = std::minmax_element(ilist.begin(), ilist.end(), comp); return std::make_pair(*p.first, *p.second); } |
Exemplo
#include <algorithm> #include <iostream> #include <vector> #include <cstdlib> #include <ctime> int main() { std::vector<int> v {3, 1, 4, 1, 5, 9, 2, 6}; std::srand(std::time(0)); std::pair<int,int> bounds = std::minmax(std::rand() % v.size(), std::rand() % v.size()); std::cout << "v[" << bounds.first << "," << bounds.second << "]: "; for (int i = bounds.first; i < bounds.second; ++i) { std::cout << v[i] << ' '; } std::cout << '\n'; }
Potencial saída:
Veja também
retorna o menor dos dois elementos Original: returns the smaller of two elements The text has been machine-translated via Google Translate. (modelo de função) [edit] | |
devolve o maior dos dois elementos Original: returns the larger of two elements The text has been machine-translated via Google Translate. (modelo de função) [edit] | |