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std::bitset::count

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< cpp‎ | utility‎ | bitset

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C++
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
std::bitset
Membri tipi
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Member types
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bitset::reference
Membri funzioni
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Member functions
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bitset::bitset
bitset::operator==
bitset::operator!=
Elemento accesso
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Element access
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bitset::operator[]
bitset::test
bitset::all
bitset::any
bitset::none		(C++11)

 
bitset::count
Capacità
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Capacity
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bitset::size
Modificatori
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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
Conversioni
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Conversions
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bitset::to_string
bitset::to_ulong
bitset::to_ullong(C++11)
Non membri funzioni
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Non-member functions
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operator&
operator|
operator^
operator<<
operator>>
Helper classi
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Helper classes
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std::hash(C++11)
 
size_t count() const;
Restituisce il numero di bit che sono impostati a true.
Original:
Returns the number of bits that are set to true.
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Indice

[modifica] Parametri

(Nessuno)
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(none)
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[modifica] Valore di ritorno

numero di bit che sono impostati a true.
Original:
number of bits that are set to true.
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[modifica] Esempio

#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

[modifica] Vedi anche
restituisce il numero di bit di dimensioni che il bitset può contenere
Original:
returns the size number of bits that the bitset can hold
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(metodo pubblico) [modifica]
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