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    std::bitset::count

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    <metanoindex/>

     
    C++
     
    Utilities-Bibliothek
     
    std::bitset
    Mitglied Typen
    Original:
    Member types
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    bitset::reference
    Member-Funktionen
    Original:
    Member functions
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    bitset::bitset
    bitset::operator==
    bitset::operator!=
    Elementzugriff zerstört
    Original:
    Element access
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    bitset::operator[]
    bitset::test
    bitset::all
    bitset::any
    bitset::none    		(C++11)

     
    bitset::count
    Kapazität
    Original:
    Capacity
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    bitset::size
    Modifiers
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    Modifiers
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    bitset::operator&=
    bitset::operator|=
    bitset::operator^=
    bitset::operator~
    bitset::operator<<=
    bitset::operator>>=
    bitset::operator<<
    bitset::operator>>
    bitset::set
    bitset::reset
    bitset::flip
    Conversions
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    Conversions
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    bitset::to_string
    bitset::to_ulong
    bitset::to_ullong(C++11)
    Non-Member-Funktionen
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    Non-member functions
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    operator&
    operator|
    operator^
    operator<<
    operator>>
    Helper-Klassen
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    Helper classes
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    std::hash(C++11)
     
    <tbody> </tbody>
    size_t count() const;
    Gibt die Anzahl der Bits, die true gesetzt werden .
    Original:
    Returns the number of bits that are set to true.
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    Parameter

    (None)
    Original:
    (none)
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    Rückgabewert

    Anzahl der Bits, die true gesetzt werden .
    Original:
    number of bits that are set to true.
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    Beispiel

    #include <iostream>
#include <bitset>

int main()
{
    std::bitset<8> b("00010010");
    std::cout << "initial value: " << b << '\n';

    // find the first unset bit
    size_t idx = 0;
    while (idx < b.size() && b.test(idx)) ++idx;

    // continue setting bits until half the bitset is filled
    while (idx < b.size() && b.count() < b.size()/2) {
        b.set(idx);
        std::cout << "setting bit " << idx << ": " << b << '\n';
        while (idx < b.size() && b.test(idx)) ++idx;
    }

}

    Output: 

    initial value: 00010010
setting bit 0: 00010011
setting bit 2: 00010111

    Siehe auch
    gibt die Größe Anzahl von Bits, die bitset halten kann
    Original:
    returns the size number of bits that the bitset can hold
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    (öffentliche Elementfunktion) [edit]