How to Initialize a Bitset of Unknown Size in C ?

How to Define Bitset Size at Initialization

When defining a bitset in C , you can specify the size at initialization time. However, this becomes difficult when the size is not known until after the variable has been declared.

Consider the following code:

#include <bitset>

class Test {
public:
    std::bitset *myBitset;
};

This code will not compile because the size of the bitset is not specified. You cannot use a pointer to a bitset of unknown size.

One solution is to use the dynamic_bitset class from the Boost library:

#include <boost/dynamic_bitset.hpp>

class Test {
public:
    boost::dynamic_bitset<> myBitset;
};

This allows you to create a bitset of any size at runtime.

Another solution is to use a vector of booleans:

#include <vector>

class Test {
public:
    std::vector<bool> myBitset;
};

This is not ideal, but it works because vectors of booleans are specialized to act like bitsets.

Whichever solution you choose, remember that it is important to specify the size of the bitset at initialization time. Otherwise, you will run into compiler errors.

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