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std::bitset::operator[]

Da cppreference.com.
< cpp‎ | utility‎ | bitset

 
 
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
Original:
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
Original:
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
Original:
Member types
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bitset::reference
Membri funzioni
Original:
Member functions
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bitset::bitset
bitset::operator==
bitset::operator!=
Elemento accesso
Original:
Element access
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bitset::operator[]
bitset::test
bitset::all
bitset::any
bitset::none
(C++11)

 
bitset::count
Capacità
Original:
Capacity
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bitset::size
Modificatori
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
Conversioni
Original:
Conversions
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bitset::to_string
bitset::to_ulong
bitset::to_ullong(C++11)
Non membri funzioni
Original:
Non-member functions
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operator&
operator|
operator^
operator<<
operator>>
Helper classi
Original:
Helper classes
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std::hash(C++11)
 
bool operator[]( std::size_t pos ) const;
constexpr bool operator[]( std::size_t pos ) const;
(1) (C fino + 11)
(dal C++11)
reference operator[]( std::size_t pos );
(2)
Accede al bit in pos posizione. La prima versione restituisce il valore del bit, la seconda versione restituisce un oggetto di std::bitset::reference tipo che consente la modifica del valore.
Original:
Accesses the bit at position pos. The first version returns the value of the bit, the second version returns an object of type std::bitset::reference that allows modification of the value.
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A differenza di test(), non genera eccezioni: il comportamento è indefinito se pos è fuori dai limiti.
Original:
Unlike test(), does not throw exceptions: the behavior is undefined if pos is out of bounds.
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Indice

[modifica] Parametri

pos -
posizione del bit di ritornare
Original:
position of the bit to return
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[modifica] Valore di ritorno

1)
il valore del bit richiesto
Original:
the value of the requested bit
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2)
un oggetto di tipo std::bitset::reference, che permette la scrittura del bit richiesto.
Original:
an object of type std::bitset::reference, which allows writing to the requested bit.
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[modifica] Eccezioni

Nessuno
Original:
None
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[modifica] Esempio

#include <iostream>
#include <bitset>
 
int main()
{
    std::bitset<8> b1(42);
    for (std::size_t i = 0; i < b1.size(); ++i) {
        std::cout << "b1[" << i << "]: " << b1[i] << '\n';
    }
    b1[0] = true; // modifies the first bit through bitset::refence
    std::cout << "After setting bit 0, the bitset holds " << b1 << '\n';
}

Output:

b1[0]: 0
b1[1]: 1
b1[2]: 0
b1[3]: 1
b1[4]: 0
b1[5]: 1
b1[6]: 0
b1[7]: 0
After setting bit 0, bitset is 00101011

[modifica] Vedi anche

accede specifico bit
Original:
accesses specific bit
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(membro pubblico funzione) [edit]