C++ Bitset Library - any() Function

---

Description

The C++ function std::bitset::any() tests whether at least one bit from bitset is set or not.

Declaration

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

C++98

bool any() const;

C++11

bool any() const noexcept;

Parameters

None

Return value

Returns true if at least one bit is set otherwise false.

Exceptions

This member function never throws exception.

Example

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

#include <iostream>
#include <bitset>

using namespace std;

int main(void) {

   bitset<4> b;
   bitset<4> mask("1010");

   if (!b.any())
      cout << "All bits are unset." << endl;

   b |= mask;

   if (b.any())
      cout << "At least one bit is set." << endl;

   return 0;
}

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

All bits are unset.
At least one bit is set.