Namensräume
Varianten
Aktionen

std::all_of, std::any_of, std::none_of

Aus cppreference.com
< cpp‎ | algorithm

 
 
Algorithm Bibliothek
Funktionen
Original:
Functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Nicht-modifizierende Sequenz Operationen
Original:
Non-modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Partitionierungsoperationen
Original:
Partitioning operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Sortierung Operationen (auf sortierten Bereiche)
Original:
Sorting operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Binary Suchaktionen (auf sortierten Bereiche)
Original:
Binary search operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Set-Operationen (auf sortierten Bereiche)
Original:
Set operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Heap-Operationen
Original:
Heap operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Minimum / Maximum Operationen
Original:
Minimum/maximum operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Numerische Operationen
Original:
Numeric operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
C-Bibliothek
Original:
C library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 
definiert in Header <algorithm>
template< class InputIt, class UnaryPredicate >
bool all_of( InputIt first, InputIt last, UnaryPredicate p );
(1) (seit C++11)
template< class InputIt, class UnaryPredicate >
bool any_of( InputIt first, InputIt last, UnaryPredicate p );
(2) (seit C++11)
template< class InputIt, class UnaryPredicate >
bool none_of( InputIt first, InputIt last, UnaryPredicate p );
(3) (seit C++11)
1)
Prüft, ob unären Prädikat p kehrt true für alle Elemente im Bereich [first, last) .
Original:
Checks if unary predicate p returns true for all elements in the range [first, last).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
2)
Prüft, ob unären Prädikat p kehrt true für mindestens ein Element im Bereich [first, last) .
Original:
Checks if unary predicate p returns true for at least one element in the range [first, last).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
3)
Prüft, ob unären Prädikat p kehrt true für keine Elemente im Bereich [first, last) .
Original:
Checks if unary predicate p returns true for no elements in the range [first, last).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
das Spektrum der Elemente zu untersuchen
Original:
the range of elements to examine
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
p - unary predicate .

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

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type InputIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.

[Bearbeiten] Rückgabewert

1)
true wenn unären Prädikat kehrt true für alle Elemente im Bereich, false anders. Versandkosten true wenn der Bereich leer ist .
Original:
true if unary predicate returns true for all elements in the range, false otherwise. Returns true if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
2)
true wenn unären Prädikat kehrt true für mindestens ein Element in dem Bereich, false anders. Versandkosten false wenn der Bereich leer ist .
Original:
true if unary predicate returns true for at least one element in the range, false otherwise. Returns false if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
3)
true wenn unären Prädikat kehrt true für keine Elemente im Bereich, false anders. Versandkosten true wenn der Bereich leer ist .
Original:
true if unary predicate returns true for no elements in the range, false otherwise. Returns true if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] Komplexität

An den meisten last - first Anwendungen des Prädikats
Original:
At most last - first applications of the predicate
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] Mögliche Implementierung

First version
template< class InputIt, class UnaryPredicate >
bool all_of(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (!p(*first)) return false;
    }
    return true;
}
Second version
template< class InputIt, class UnaryPredicate >
bool any_of(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (p(*first)) return true;
    }
    return false;
}
Third version
template< class InputIt, class UnaryPredicate >
bool none_of(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (p(*first)) return false;
    }
    return true;
}

[Bearbeiten] Beispiel

#include <vector>
#include <numeric>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <functional>
 
int main()
{
    std::vector<int> v(10, 2);
    std::partial_sum(v.cbegin(), v.cend(), v.begin());
    std::cout << "Among the numbers: ";
    std::copy(v.cbegin(), v.cend(), std::ostream_iterator<int>(std::cout, " "));
    std::cout << '\n';
 
    if (std::all_of(v.cbegin(), v.cend(), [](int i){ return i % 2 == 0; })) {
        std::cout << "All numbers are even\n";
    }
    if (std::none_of(v.cbegin(), v.cend(), std::bind(std::modulus<int>(), 
                                                     std::placeholders::_1, 2))) {
        std::cout << "None of them are odd\n";
    }
    struct DivisibleBy
    {
        const int d;
        DivisibleBy(int n) : d(n) {}
        bool operator()(int n) const { return n % d == 0; }
    };
 
    if (std::any_of(v.cbegin(), v.cend(), DivisibleBy(7))) {
        std::cout << "At least one number is divisible by 7\n";
    }
}

Output:

Among the numbers: 2 4 6 8 10 12 14 16 18 20 
All numbers are even
None of them are odd
At least one number is divisible by 7