From: Alex Elder > Sent: 03 June 2021 22:55 ... > Not necessarily, sizeof(bool) is implementation defined. > And I thought you didn't think the size of the structure > was very important... It is 'implementation defined' but will be 32 bits on everything except an old 32bit ARM ABI. > In any case, I'm open to changing the type of these fields, > and my preference would be bool rather than u8, because it > is completely clear what it represents. Yes, and it isn't at all clear what it actually means. If the value of a bool memory location isn't 0 or 1 what does 'bool_a & bool_b' mean. It might be 'undefined behaviour' - but that doesn't actually exclude an ICBM hitting the coder's house! I've seen very silly code generated (by an old gcc) for simple statements like: bool_a |= bool_b; Mostly because it didn't trust the values to be 0 or 1 and wanted to ensure the result was either 0 or 1. If I use an integer type (as in traditional C) I know what I'm getting and there are no unexpected comparisons and conditionals. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
