std::bitset::operator[]
Da cppreference.com.
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| bool operator[]( std::size_t pos ) const; constexpr bool operator[]( std::size_t pos ) const; |
(1) | (fino al c++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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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Indice |
[modifica] Parametri
| pos | - | posizione del bit di ritornare
Original: position of the bit to return The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifica] Valore di ritorno
1)il valore del bit richiesto
2) Original:
the value of the requested bit
The text has been machine-translated via Google Translate.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
