How to write a byte represented as a bitstring to a file in c++?

Question

For example, I have a

string str = "10010010";

How do I write this as a single byte to a file?

Not to write string "10010010" , but to have 0b10010010 when I look at a bits dump of the file.

Answer 1

Something like this should work:

std::string str = "10010010";
uint8_t byte = static_cast<uint8_t>(std::bitset<8>(str).to_ulong() & 0xFFul);
file.write(&byte,1);

References:

• std::string
• std::bitset
• std::ostream::write()