Is there a 128 bit integer in C++?

Question

I need to store a 128 bits long UUID in a variable. Is there a 128-bit datatype in C++? I do not need arithmetic operations, I just want to easily store and read the value v

Answer 1

I would recommend using std::bitset<128> (you can always do something like using UUID = std::bitset<128>;). It will probably have a similar memory layout to the custom struct proposed in the other answers, but you won't need to define your own comparison operators, hash etc.