What is the bitset::all() function in C++?
The bitset::all() function in C++ is used to find whether all the bits available in the bitset object are set. This function is available in the bitset header file.
Syntax
The syntax of the bitset::all() function is shown below.
bool all();
Parameters
The function does not accept any parameters.
Return value
The all() function returns a boolean value, where true denotes that all the bits are set and false denotes that any one bit is not set.
Code
Let’s have a look at the code.
#include <iostream>#include <bitset>using namespace std;int main() {bitset<4> b1 = 15;if (b1.all())cout << "All bits are set in " << b1;elsecout << "All bits are not set in " << b1;return 0;}
Explanation
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In lines 1 and 2, we import the required header files.
-
In line 6, we create a
bitsetobject that has the capacity to store 4 bits. This object will contain the binary representation of the integer 15. -
In line 8, we call the
all()function and print if all the bits are set. -
If all the bits are not set, then, in line 11, we print the corresponding message.
In this way, we can use the bitset::all() function to check whether all the bits are set.
