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    std::bitset::test

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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
    Original:
    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
    Original:
    Conversions
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    bitset::to_string
    bitset::to_ulong
    bitset::to_ullong(C++11)
    Non-Member-Funktionen
    Original:
    Non-member functions
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    operator&
    operator|
    operator^
    operator<<
    operator>>
    Helper-Klassen
    Original:
    Helper classes
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    std::hash(C++11)
     
    <tbody> </tbody>
    bool test( size_t pos ) const;
    Gibt den Wert des Bits an der Position pos .
    Original:
    Returns the value of the bit at the position pos.
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    Im Gegensatz zu operator[](), führt eine Grenzüberprüfungsfehler und wirft std::out_of_range wenn pos nicht auf eine gültige Position in der bitset entsprechen .
    Original:
    Unlike operator[](), performs a bounds check and throws std::out_of_range if pos does not correspond to a valid position in the bitset.
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    Parameter

    pos -
    Position des Bits, um zurückzukehren
    Original:
    position of the bit to return
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    Rückgabewert

    true wenn das angeforderte Bit gesetzt ist, false sonst .
    Original:
    true if the requested bit is set, false otherwise.
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    Ausnahmen

    std::out_of_range wenn pos nicht auf eine gültige Position innerhalb der bitset entsprechen .
    Original:
    std::out_of_range if pos does not correspond to a valid position within the bitset.
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    Beispiel

    #include <iostream>
#include <bitset>

int main() 
{
    std::bitset<10> b1("1111010000");

    size_t idx = 0;
    while (idx < b1.size() && !b1.test(idx)) {
      ++idx;
    }

    if (idx < b1.size()) {
        std::cout << "first set bit at index " << idx << '\n';
    } else {
        std::cout << "no set bits\n";
    }

    return 0;
}

    Output: 

    first set bit at index 4

    Siehe auch
    greift bestimmtes Bit
    Original:
    accesses specific bit
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    (öffentliche Elementfunktion) [edit]