C++ Bitset Library - bitset() Function

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Description

The C++ constructor std::bitset::bitset() constructs and initializes a bitset container from C++ string object.

Declaration

Following is the declaration for std::bitset::bitset() constructor form std::bitset header.

C++98

 template<class charT, class traits, class Alloc> explicit bitset (const basic_string<charT,traits,Alloc>& str, typename basic_string<charT,traits,Alloc>::size_type pos = 0, typename basic_string<charT,traits,Alloc>::size_type n = basic_string<charT,traits,Alloc>::npos ); 

C++11

 template <class charT, class traits, class Alloc> explicit bitset (const basic_string<charT,traits,Alloc>& str, typename basic_string<charT,traits,Alloc>::size_type pos = 0, typename basic_string<charT,traits,Alloc>::size_type n = basic_string<charT,traits,Alloc>::npos, charT zero = charT('0'), charT one = charT('1') ); 

Parameters

• str − String used to initialize the bitset.

• pos − A starting offset of str.

• n − Number of characters from str.

Return value

Constructor never returns value.

Exceptions

If pos > str.size() then method throws out_of_range exception.

Example

The following example shows the usage of std::bitset::bitset() constructor.

 #include <iostream> #include <bitset> #include <string> using namespace std; int main(void) { string s = "1100"; bitset<4>b(s); cout << b << endl; return 0; } 

Let us compile and run the above program, this will produce the following result −

 1100