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std::max

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< cpp‎ | algorithm

 
 
Biblioteca de algoritmos
Políticas de ejecución (C++17)
Operaciones no modificadoras de secuencia
(C++11)(C++11)(C++11)
(C++17)
Operaciones modificadoras de secuencia
Operaciones en almacenamiento no inicializado
Operaciones de partición
Operaciones de ordenación
(C++11)
Operaciones de búsqueda binaria
Operaciones de set (en rangos ordenados)
Operaciones de pila
(C++11)
Operaciones minimo/maximo
(C++11)
(C++17)
Permutaciones
Operaciones numéricas
Bibliotecas C
 
Definido en la cabecera <algorithm>
template< class T >
const T& max( const T& a, const T& b );
(1)
template< class T, class Compare >
const T& max( const T& a, const T& b, Compare comp );
(2)
template< class T >
T max( std::initializer_list<T> ilist);
(3) (desde C++11)
template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp );
(4) (desde C++11)
1-2)
Devuelve el mayor de los dos valores .
Original:
Returns the greater of the two values.
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3-4)
Devuelve el mayor de los valores en la lista de inicializadores ilist .
Original:
Returns the greatest of the values in initializer list ilist.
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Las versiones (1,3) operator< utilizar para comparar los valores, las versiones (2,4) utilizar la función de comparación dado comp .
Original:
The (1,3) versions use operator< to compare the values, the (2,4) versions use the given comparison function comp.
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Contenido

[editar] Parámetros

a, b -
los valores para comparar
Original:
the values to compare
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ilist -
inicializador lista con los valores a comparar
Original:
initializer list with the values to compare
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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:

 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.
The types Type1 and Type2 must be such that an object of type T can be implicitly converted to both of them. ​

Requerimientos de tipo
-
T debe reunir los requerimientos de LessThanComparable. for the overloads (1) and (3)
-
T debe reunir los requerimientos de CopyConstructible. for the overloads (3) and (4)

[editar] Valor de retorno

1-2)
El mayor de a y b. Si son equivalentes, vuelve a .
Original:
The greater of a and b. If they are equivalent, returns a.
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3-4)
El mayor valor en ilist. Si varios valores son equivalentes a los más grandes, más a la izquierda devuelve el uno .
Original:
The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.
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[editar] Complejidad

1-2)
Constant
Original:
Constant
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3-4)
Lineal en ilist.size()
Original:
Linear in ilist.size()
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[editar] Posible implementación

Primera versión
template<class T> 
const T& max(const T& a, const T& b)
{
    return (a < b) ? b : a;
}
Segunda versión
template<class T, class Compare> 
const T& max(const T& a, const T& b, Compare comp)
{
    return (comp(a, b)) ? b : a;
}
Tercera versión
template< class T >
T max( std::initializer_list<T> ilist)
{
    return *std::max_element(ilist.begin(), ilist.end());
}
Cuarta versión
template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp )
{
    return *std::max_element(ilist.begin(), ilist.end(), comp);
}

[editar] Ejemplo

#include <algorithm>
#include <iostream>
#include <string> 
int main()
{
    std::cout << "larger of 1 and 9999: " << std::max(1, 9999) << '\n'
              << "larger of 'a', and 'b': " << std::max('a', 'b') << '\n'
              << "longest of \"foo\", \"bar\", and \"hello\": " <<
                  std::max( { "foo", "bar", "hello" },
                            [](const std::string& s1, const std::string& s2) {
                                 return s1.size() < s2.size();
                             }) << '\n';
}

Salida:

larger of 1 and 9999: 9999
larger of 'a', and 'b': b
longest of "foo", "bar", and "hello": hello

[editar] Ver también

devuelve el menor de los dos elementos
Original:
returns the smaller of two elements
The text has been machine-translated via Google Translate.
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(plantilla de función) [editar]
(C++11)
devuelve el. más grande y el más pequeño de los dos elementos
Original:
returns the larger and the smaller of two elements
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(plantilla de función) [editar]
devuelve el elemento más grande de un rango
Original:
returns the largest element in a range
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(plantilla de función) [editar]