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std::transform

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< cpp‎ | algorithm

 
 
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 InputIt, class OutputIt, class UnaryOperation >

OutputIt transform( InputIt first1, InputIt last1, OutputIt d_first,

                    UnaryOperation unary_op );
(1)
template< class InputIt1, class InputIt2, class OutputIt, class BinaryOperation >

OutputIt transform( InputIt1 first1, InputIt1 last1, InputIt2 first2,

                    OutputIt d_first, BinaryOperation binary_op );
(2)
std::transform applique la fonction donnée à un large et stocke le résultat dans une autre gamme, à partir de d_first .
Original:
std::transform applies the given function to a range and stores the result in another range, beginning at d_first.
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Dans la première version unary_op opération unaire est appliquée à la plage définie par [first1, last1). Dans la deuxième version de la binary_op opération binaire est appliqué à des paires d'éléments de deux gammes: l'une définie par [first1, last1) et l'autre commençant à first2 .
Original:
In the first version unary operation unary_op is applied to the range defined by [first1, last1). In the second version the binary operation binary_op is applied to pairs of elements from two ranges: one defined by [first1, last1) and the other beginning at first2.
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Sommaire

[modifier] Paramètres

first1, last1 -
la première gamme d'éléments à transformer
Original:
the first range of elements to transform
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first2 -
le début de la seconde gamme d'éléments de transformation
Original:
the beginning of the second range of elements to transform
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d_first -
le début de la plage de destination, peut être égal à ou first1 first2
Original:
the beginning of the destination range, may be equal to first1 or first2
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unary_op - unary operation function object that will be applied.

The signature of the function should be equivalent to the following:

 Ret fun(const Type &a);

The signature does not need to have const &.
The type  Type must be such that an object of type InputIt can be dereferenced and then implicitly converted to  Type. The type  Ret must be such that an object of type OutputIt can be dereferenced and assigned a value of type  Ret. ​

binary_op - binary operation function object that will be applied.

The signature of the function should be equivalent to the following:

 Ret fun(const Type1 &a, const Type2 &b);

The signature does not need to have const &.
The types  Type1 and  Type2 must be such that objects of types InputIt1 and InputIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively. The type  Ret must be such that an object of type OutputIt can be dereferenced and assigned a value of type  Ret. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
InputIt1 must meet the requirements of InputIterator.
-
InputIt2 must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[modifier] Retourne la valeur

itérateur de sortie de l'élément après le dernier élément transformé .
Original:
output iterator to the element past the last element transformed.
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[modifier] Complexité

1)
exactement std::distance(first1, last1) applications de unary_op
Original:
exactly std::distance(first1, last1) applications of unary_op
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2)
exactement std::distance(first1, last1) applications de binary_op
Original:
exactly std::distance(first1, last1) applications of binary_op
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[modifier] Exigences

unary_op et binary_op n'ont pas d'effets secondaires. (avant C++11)
Original:
unary_op and binary_op have no side effects. (avant C++11)
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unary_op et binary_op n'invalident pas les itérateurs, y compris les itérateurs de fin, ou de modifier les éléments des gammes concernées. (depuis C++11)
Original:
unary_op and binary_op do not invalidate any iterators, including the end iterators, or modify any elements of the ranges involved. (depuis C++11)
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Le but de ces exigences est de permettre des implémentations parallèles ou out-of-order de std::transform. Pour appliquer une fonction à une séquence dans l'ordre, utiliser std::for_each .
Original:
The intent of these requirements is to allow parallel or out-of-order implementations of std::transform. To apply a function to a sequence in-order, use std::for_each.
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[modifier] Mise en œuvre possible

First version
template<class InputIt, class OutputIt, class UnaryOperation>
OutputIt transform(InputIt first1, InputIt last1, OutputIt d_first, 
                   UnaryOperation unary_op)
{
    while (first1 != last1) {
        *d_first++ = unary_op(*first1++);
    }
    return d_first;
}
Second version
template<class InputIt1, class InputIt2, 
         class OutputIt, class BinaryOperation>
OutputIt transform(InputIt first1, InputIt last1, InputIt first2, 
                   OutputIt d_first, BinaryOperation binary_op)
{
    while (first1 != last1) {
        *d_first++ = binary_op(*first1++, *first2++);
    }
    return d_first;
}

[modifier] Exemple

Le code suivant utilise transformer pour convertir une chaîne en majuscules à l'aide de la fonction toupper:
Original:
The following code uses transform to convert a string to uppercase using the toupper function:
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#include <string>
#include <cctype>
#include <algorithm>
#include <iostream>
 
int main()
{
    std::string s("hello");
    std::transform(s.begin(), s.end(), s.begin(), (int (*)(int))std::toupper);
    std::cout << s;
 }

Résultat :

HELLO

[modifier] Voir aussi

applique une fonction à une série d'éléments
Original:
applies a function to a range of elements
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(fonction générique) [edit]