std::bitset<N>::to_ullong

 

C++

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Language support library

Concepts library (C++20)

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Utilities library

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Ranges library (C++20)

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Numerics library

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Regular expressions library (C++11)

Atomic operations library (C++11)

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Technical Specifications

 

Utilities library

Type support (basic types, RTTI, type traits)
Dynamic memory management
Error handling
Program utilities
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Library feature-test macros
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Function objects
initializer_list (C++11)
bitset
hash (C++11)
integer_sequence (C++14)
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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
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strong_order weak_order partial_order strong_equal weak_equal	strong_ordering weak_ordering partial_ordering strong_equality weak_equality	is_eqis_neqis_ltis_lteqis_gtis_gteq
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std::bitset

Member types

bitset::reference

Member functions

bitset::bitset

bitset::operator==bitset::operator!=

Element access

bitset::operator[]

bitset::test

bitset::allbitset::anybitset::none (C++11)

bitset::count

Capacity

bitset::size

Modifiers

bitset::operator&=bitset::operator|=bitset::operator^=bitset::operator~

bitset::operator<<=bitset::operator>>=bitset::operator<<bitset::operator>>

bitset::set

bitset::reset

bitset::flip

Conversions

bitset::to_string

bitset::to_ulong

bitset::to_ullong (C++11)

Non-member functions

operator&operator|operator^

operator<<operator>>

Helper classes

std::hash (C++11)

 

unsigned long long to_ullong() const		(since C++11)

Converts the contents of the bitset to an unsigned long long integer.

The first bit of the bitset corresponds to the least significant digit of the number and the last bit corresponds to the most significant digit.

Parameters

(none)

Return value

the converted integer

Exceptions

std::overflow_error if the value can not be represented in unsigned long long.

Example

Run this code

#include <iostream>
#include <bitset>
#include <limits>
 
int main()
{
    std::bitset<std::numeric_limits<unsigned long long>::digits> b(
        0x123456789abcdef0LL
    );
 
    std::cout << b << "  " << std::hex << b.to_ullong() << '\n';
    b.flip();
    std::cout << b << "  " << b.to_ullong() << '\n';
}

Output:

0001001000110100010101100111100010011010101111001101111011110000  123456789abcdef0
1110110111001011101010011000011101100101010000110010000100001111  edcba9876543210f

See also

to_string	returns a string representation of the data (public member function)
to_ulong	returns an unsigned long integer representation of the data (public member function)