How to use the bitset class of C++

This article mainly introduces "how to use the bitset class of C++". In daily operation, I believe many people have doubts about how to use the bitset class of C++. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how to use the bitset class of C++". Next, please follow the editor to study!

1.bitset class

Std::bitset is a STL class that handles information represented by bit and bit flags. It is not a STL container class because it cannot adjust the length. To use the bitset class, you must include a header file:

# include

Instantiate std::bitset

When you instantiate this template class, you must specify the number of digits to manage:

Bitset fourBits; / / initialized to 0000

Initialize a sequence expressed as the literal quantity of a string (char*):

Bitset fiveBits ("10101")

two。 Use std::bitset and its members

Operator of bitset

1. > >

"0101" > > fourBits; / / insert a string into the bitset object

2. &

Perform bitwise and operation

3. |

To perform a bitwise or operation.

4.^

Perform bitwise XOR operation

5. > > =

Perform a bitwise move to the right

Member functions of bitset

1.set

FourBits.set (); / / all bits are set to 1

2.set (N, val=1) / / set bit N + 1 to val (default is 1 if there is no second parameter)

FourBits.set (2,0); / / the third bit is set to 0

3.reset

FourBits.reset (); / / reset all bits to 0

4.reset (N) / / reset N + 1 to 0

5.flip

FourBits.flip (); / / so bit inversion

6.fourBit.size (); / / returns the number of digits in the sequence

7.count

FourBits.count (); / / returns the number of digits with a value of 1 in the sequence

* * disadvantage: * * bitset cannot adjust the length dynamically. To overcome this disadvantage, STL provides the vectorl class (bit_vector in some STL implementations)

2.vector

Vector is a partial materialization of std::vector for storing Boolean data. This class can adjust the length dynamically. Before using it, you must include the header file:

# include

Instantiate vector

Contains 10 bool elements, each initialized to true:

Vector vecBool (10, true)

Use one vector to create another vector:

Vector vecBoolCopy (vecBool)

Member functions of vector

1.vector provides the function flip (), which is used to reverse Boolean values in a sequence.

2.vector is very similar to vector

The following demonstrates the use of vector's member functions:

# include # include using namespace std;int main () {vectorvecBool (3); vecBool [0] = true; vecBool [1] = false; vecBool [2] = true; vecBool.push_back (false); cout