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Showing content from https://cplusplus.com/reference/bitset/bitset/any/ below:

public member function

<bitset>

std::bitset::any 
bool any() const noexcept;

Test if any bit is set

Returns whether any of the bits is set (i.e., whether at least one bit in the bitset is set to one).

This is the opposite of bitset::none.



Parameters none

Return valuetrue if any of the bits in the bitset is set (to one), and false otherwise.

Example 
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// bitset::any
#include <iostream>       // std::cin, std::cout
#include <bitset>         // std::bitset

int main ()
{
  std::bitset<16> foo;

  std::cout << "Please, enter a binary number: ";
  std::cin >> foo;

  if (foo.any())
    std::cout << foo << " has " << foo.count() << " bits set.\n";
  else
    std::cout << foo << " has no bits set.\n";

  return 0;
}

Possible output: 
Please, enter a binary number: 10110
0000000000010110 has 3 bits set.


Data races The bitset is accessed.

Exception safetyNo-throw guarantee: never throws exceptions.

See also
bitset::count
Count bits set (public member function)
bitset::none
Test if no bit is set (public member function)
bitset::test
Return bit value (public member function)

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