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std::for_each

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Algorithm Bibliothek
Funktionen
Original:
Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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all_of
any_of
none_of
(C++11)
(C++11)
(C++11)
for_each
count
count_if
mismatch
equal
Modifizierende Sequenz Operationen
Original:
Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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Defined in header <algorithm>
template< class InputIt, class UnaryFunction >
UnaryFunction for_each( InputIt first, InputIt last, UnaryFunction f );
Wendet die angegebene Funktion Objekt f dem Ergebnis der Dereferenzierung jeden Iterator im Bereich [first, last), in Ordnung. Wenn InputIt eine veränderliche Iterator ist, kann f die Elemente des Bereichs durch die dereferenziert Iterator ändern. Wenn f ein Ergebnis zurückgibt, wird das Ergebnis ignoriert .
Original:
Applies the given function object f to the result of dereferencing every iterator in the range [first, last), in order. If InputIt is a mutable iterator, f may modify the elements of the range through the dereferenced iterator. If f returns a result, the result is ignored.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
der Bereich um die Funktion zu verarbeiten
Original:
the range to apply the function to
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f -
die einstellige Funktion Objekt angewendet werden
Original:
the unary function object to be applied
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Type requirements
-
InputIt must meet the requirements of InputIterator.
-
UnaryFunction must meet the requirements of MoveConstructible. Does not have to be CopyConstructible

[Bearbeiten] Rückgabewert

f. (bis C + +11)
std::move(f). (seit C++11)

[Bearbeiten] Komplexität

Genau last - first Anwendungen f
Original:
Exactly last - first applications of f
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[Bearbeiten] Mögliche Implementierung

template<class InputIt, class UnaryFunction>
UnaryFunction for_each(InputIt first, InputIt last, UnaryFunction f)
{
    for (; first != last; ++first) {
        f(*first);
    }
    return f;
}

[Bearbeiten] Beispiel

Im folgenden Beispiel wird ein Lambda-Funktion um alle Elemente eines Vektors inkrementieren und berechnet dann eine Summe von ihnen:
Original:
The following example uses a Lambda-Funktion to increment all of the elements of a vector and then computes a sum of them:
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#include <vector>
#include <algorithm>
#include <iostream>
 
struct Sum {
    Sum() { sum = 0; }
    void operator()(int n) { sum += n; }
 
    int sum;
};
 
int main()
{
    std::vector<int> nums{3, 4, 2, 9, 15, 267};
 
    std::cout << "before: ";
    for (auto n : nums) {
        std::cout << n << " ";
    }
    std::cout << '\n';
 
    std::for_each(nums.begin(), nums.end(), [](int &n){ n++; });
    Sum s = std::for_each(nums.begin(), nums.end(), Sum());
 
    std::cout << "after:  ";
    for (auto n : nums) {
        std::cout << n << " ";
    }
    std::cout << '\n';
    std::cout << "sum: " << s.sum << '\n';
}

Output:

before: 3 4 2 9 15 267
after:  4 5 3 10 16 268
sum: 306

[Bearbeiten] Siehe auch

gilt eine Funktion einer Reihe von Elementen
Original:
applies a function to a range of elements
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(Funktions-Template) [edit]
range-for-Schleife
führt eine Schleife über Spektrum (seit C++11)
Original:
executes loop over range (seit C++11)
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[edit]