Is there a fixed-width bool type in standard C++?

Question

As far as I could find, the width of the bool type is implementation-defined. But are there any fixed-width boolean types, or should I stick to, for e.g., a uint8_t to represent a fixed-width bool?

[EDIT] I made this python script that auto-generates a C++ class which can hold the variables I want to be able to send between a micro controller and my computer. The way it works is that it also keeps two arrays holding a pointer to each one of these variables and the sizeof each one of them. This gives me the necessary information to easily serialize and deserialize each one of these variables. For this to work however the sizeof, endianness, etc of the variable types have to be the same on both sides since I'm using the same generated code on both sides. I don't know if this will be a problem yet, but I don't expect it to be. I have already worked with this (32bit ARM) chip before and haven't had problems sending integer and float types in the past. However it will be a few days until I'm back and can try booleans out on the chip. This might be a bigger issue later, since this code might be reused on other chips later.

So my question is. Is there a fixed width bool type defined in the standard libraries or should I just use a uint8_t to represent the boolean?

Answer 1

There is not. Just use uint8_t if you need to be sure of the size. Any integer type can easily be treated as boolean in C-related languages. See https://stackoverflow.com/a/4897859/1105015 for a lengthy discussion of how bool's size is not guaranteed by the standard to be any specific value.