public member function
<bitset>

std::bitset::bitset

bitset ( );

bitset ( unsigned long val );

template<class charT, class traits, class Allocator>
explicit bitset ( const basic_string<charT,traits,Allocator>& str,
   typename basic_string<charT,traits,Allocator>::size_type pos = 0,
   typename basic_string<charT,traits,Allocator>::size_type n =
      basic_string<charT,traits,Allocator>::npos);
Construct bitset
Constructs a bitset container object.
If the default constructor is used, the bitset is initialized with zeros, otherwise its initial content depends on the parameters used:

Bitsets have a fixed size, which is determined by their class's template parameter:
 
 
template <size_t N> class bitset;


Where N is the size, specified as an integer value of type size_t.

Parameters

val
Integral value whose bits are copied to the bitset elements, up to the smaller of the bitset size and the size in bits of an unsigned long.
str
String containing a binary value (zeros and ones). These are parsed and used to initizialize the bits. If some character other than zero or one is found, the function throws an invalid_argument exception.
pos
First character in the string to be read as the content for the bitset.
n
Number of characters to read. A value of string::npos specifies that as many characters as possible are to be read.

Example

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// constructing bitsets
#include <iostream>
#include <string>
#include <bitset>
using namespace std;

int main ()
{
  bitset<10> first;                   // empty bitset

  bitset<10> second (120ul);          // initialize from unsigned long

  bitset<10> third (string("01011")); // initialize from string

  return 0;
}


The code does not produce any output, but demonstrates some ways in which a bitset container can be constructed.

See also

bitset::set
Set bits (public member function)
bitset::reset
Reset bits (public member function)
bitset::operator[]
Access bit (public member function)
bitset operators
Bitset operators (function )