The **`bitset::any()` function** in C++ is used to find if any of the bits available in the `bitset` object are set or not. This function is available in the `bitset` header file.

#   
#  Syntax
The syntax of the `bitset::any()` function is shown below:

---
```
bool any();
```
---
#  Parameters
The function does not accept any parameters.

##   
## Return value
The function returns a boolean value, where `true` denotes if any of the bits are set, and `false` indicates that none are set. 
##   
## Code
Let's have a look at the code:

#include <iostream>
#include <bitset>
using namespace std;

int main() {
  bitset<4> b1 = 10;

  if (b1.any())
    cout << "Some bits are set in " << b1;
  else
    cout << "None of the bits are not set in " << b1;

  return 0;
}

#    
## Explanation

* In _lines 1 and 2_, we import the required header files.
* In _line 6_, we create a `bitset` object with the capacity to store *4* bits. This object will contain the binary representation of the integer *10*. 

* In _line 8_, we call the `any()` function and print if any of the bits are set. 
* If none of the bits are set, then, in _line 11_, we print the corresponding message.

In this way, we can use the `bitset::any()` function to check if any of the bits are set or not.

What is the bitset::any() function in C++?

The bitset::any() function in C++ checks if any bits in a bitset are set, returning true if so.