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std::max

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< cpp‎ | algorithm

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C++
 
Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Définir les opérations (sur les gammes triés)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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Minimum / maximum de fonctionnement
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Minimum/maximum operations
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Opérations numériques
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Numeric operations
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Bibliothèque C
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C library
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Defined in header <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) (depuis C++11)
template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp );
 (4) (depuis C++11)
1-2)
Retourne la plus grande des deux valeurs .
Original:
Returns the greater of the two values.
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3-4)
Renvoie la plus grande des valeurs dans ilist liste d'initialisation .
Original:
Returns the greatest of the values in initializer list ilist.
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Les versions (1,3) operator< utiliser pour comparer les valeurs, les versions (2,4) utiliser la fonction de comparaison donnée 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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Sommaire

[modifier] Paramètres

a, b -
les valeurs de comparaison
Original:
the values to compare
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ilist -
initialiseur liste avec les valeurs à comparer
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. ​

Type requirements
-
T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
-
T must meet the requirements of CopyConstructible. for the overloads (3) and (4)

[modifier] Retourne la valeur

1-2)
Le plus élevé des a et b. Si elles sont équivalentes, les rendements a .
Original:
The greater of a and b. If they are equivalent, returns a.
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3-4)
La plus grande valeur dans ilist. Si plusieurs valeurs sont équivalentes à la plus grande, retourne le plus à gauche .
Original:
The greatest value in ilist. If several values are equivalent to the greatest, returns the leftmost one.
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[modifier] Complexité

1-2)
Constante
Original:
Constant
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3-4)
Linéaire dans ilist.size()
Original:
Linear in ilist.size()
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[modifier] Mise en œuvre possible

First version 
template<class T> 
const T& max(const T& a, const T& b)
{
    return (a < b) ? b : a;
}
Second version 
template<class T, class Compare> 
const T& max(const T& a, const T& b, Compare comp)
{
    return (comp(a, b)) ? b : a;
}
Third version 
template< class T >
T max( std::initializer_list<T> ilist)
{
    return *std::max_element(ilist.begin(), ilist.end());
}
Fourth version 
template< class T, class Compare >
T max( std::initializer_list<T> ilist, Compare comp )
{
    return *std::max_element(ilist.begin(), ilist.end(), comp);
}

[modifier] Exemple

#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';
}

Résultat : 

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

[modifier] Voir aussi
retourne le plus petit des deux éléments
Original:
returns the smaller of two elements
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(fonction générique) [edit]
(C++11)
renvoie l'. plus grande et la plus petite des deux éléments
Original:
returns the larger and the smaller of two elements
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(fonction générique) [edit]
retourne le plus grand élément dans une plage
Original:
returns the largest element in a range
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(fonction générique) [edit]
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