std::minmax
De cppreference.com
| Definido en el archivo de encabezado <algorithm>
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template< class T >
std::pair<const T&,const T&> minmax( const T& a, const T& b );
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(1) | (desde C++11) |
template< class T, class Compare >
std::pair<const T&,const T&> minmax( const T& a, const T& b, Compare comp );
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(2) | (desde C++11) |
template< class T >
std::pair<T,T> minmax( std::initializer_list<T> ilist);
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(3) | (desde C++11) |
template< class T, class Compare >
std::pair<T,T> minmax( std::initializer_list<T> ilist, Compare comp );
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(4) | (desde C++11) |
1-2)
Devuelve el menor y el mayor de los dos valores .
Original:
Returns the smaller and the greater of the two values.
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3-4)
Devuelve la lista más pequeño y el más grande de los valores en el inicializador
ilist .Original:
Returns the smallest and the greatest of the values in initializer list
ilist.The text has been machine-translated via Google Translate.
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Las versiones (1,3)
operator< utilizar para comparar los valores, mientras que las versiones (2,4) utilizar la función de comparación dado comp .Original:
The (1,3) versions use
operator< to compare the values, whereas the (2,4) versions use the given comparison function comp.The text has been machine-translated via Google Translate.
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Parámetros
| a, b | - | los valores para comparar
Original: the values to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| ilist | - | inicializador lista con los valores a comparar
Original: initializer list with the values to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| comp | - | objeto función de comparación (es decir, un objeto que satisface los requerimientos de Compare) que devuelve true si if a is less than b. La signatura de la función de comparación deberá ser equivalente a lo siguiente:
Mientras que la signatura no necesita ser |
| Requisitos de tipo | ||
-T debe reunir los requerimientos de LessThanComparable. for the overloads (1) and (3)
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-T debe reunir los requerimientos de CopyConstructible. for the overloads (3) and (4)
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Valor de retorno
1-2)
Devuelve el resultado de
std::make_pair(a, b) si a<b o si a es equivalente a b. Devuelve el resultado de std::make_pair(b, a) si 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.The text has been machine-translated via Google Translate.
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3-4)
Un par con el valor más pequeño en
ilist como el primer elemento y el más grande como el segundo. Si varios elementos son equivalentes a los más pequeños, el elemento tal extremo izquierdo se devuelve. Si varios elementos son equivalentes a la más grande, el elemento más a la derecha como se devuelve .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.The text has been machine-translated via Google Translate.
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Complejidad
1-2)
Constant
Original:
Constant
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3-4)
Lineal en
ilist.size()Original:
Linear in
ilist.size()The text has been machine-translated via Google Translate.
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Posible implementación
| Primera versión |
|---|
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);
}
|
| Segunda versión |
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);
}
|
| Tercera versión |
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);
}
|
| Cuarta versión |
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);
}
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Ejemplo
Ejecuta este código
#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';
}
Posible salida:
v[2,7]: 4 1 5 9 2