c++ - How does one store a vector<bool> or a bitset into a file, but bit-wise?

Question

How to write bitset data to a file?

The first answer doesn't answer the question correctly, since it takes 8 times more space than it should.

How would you do it ? I really need it to save a lot of true/false values.

Answer 1

Simplest approach : take consecutive 8 boolean values, represent them as a single byte, write that byte to your file. That would save lot of space.

In the beginning of file, you can write the number of boolean values you want to write to the file; that number will help while reading the bytes from file, and converting them back into boolean values!