bitset::to_ulong

Converts a bitset object to the integer that would generate the sequence of bits contained if used to initialize the bitset.

unsigned long to_ulong( ) const;

Return Value

An integer that would generate the bits in a bitset if used in the initialization of the bitset.

Remarks

Applying the member function would return the integer that has the same sequence of 1 and 0 digits as is found in sequence of bits contained in the bitset.

The member function throws overflow_error if any bit in the bit sequence has a bit value that cannot be represented as a value of type unsigned long*.*

Example

// bitset_to_ulong.cpp
// compile with: /EHsc
#include <bitset>
#include <iostream>

int main( )
{
   using namespace std;

   bitset<5> b1 ( 7 );

   cout << "The ordered set of bits in the bitset<5> b1( 7 )"
        << "\n that was generated by the number 7 is: ( "
        << b1 << " )" << endl;

   unsigned long int i;
   i = b1.to_ulong( );
   cout << "The integer returned from the bitset b1,"
        << "\n by the member function to_long( ), that"
        << "\n generated the bits as a base two number is: "
        << i << "." << endl;
}

The ordered set of bits in the bitset<5> b1( 7 )
 that was generated by the number 7 is: ( 00111 )
The integer returned from the bitset b1,
 by the member function to_long( ), that
 generated the bits as a base two number is: 7.

Requirements

Header: <bitset>

Namespace: std

See Also

Reference

bitset Class