Visual Studioでのビットフィールド


If set, RECORD_TYPE bit-fields are laid out following the rules of
Microsoft Visual C/C++, namely: (i) a bit-field won't share the
same storage unit with the previous bit-field if their underlying
types have different sizes, and the bit-field will be aligned to
the highest alignment of the underlying types of itself and of the
previous bit-field; (ii) a zero-sized bit-field will affect the
alignment of the whole enclosing structure, even if it is unnamed;
except that (iii) a zero-sized bit-field will be disregarded
unless it follows another bit-field of non-zero size. Currently,
this option is supported on `cygwin' and `mingw32'.