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std::bitset::count

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< cpp‎ | utility‎ | bitset
 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
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Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
std::bitset
Tipos de miembros
Original:
Member types
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Las funciones miembro
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Member functions
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Elemento acceso
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Element access
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bitset::count
Capacidad
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Capacity
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Modificadores
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Modifiers
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Conversiones
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Conversions
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Terceros funciones
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Non-member functions
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Clases de ayuda
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Helper classes
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(C++11)
 
size_t count() const;
Devuelve el número de bits que se establecen a true .
Original:
Returns the number of bits that are set to true.
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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

número de bits que se establecen a true .
Original:
number of bits that are set to true.
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[editar] Ejemplo

#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;
    }
 
}

Salida:

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

[editar] Ver también

devuelve el número del tamaño de bits que el bitset puede contener
Original:
returns the size number of bits that the bitset can hold
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(función miembro público) [editar]