Turns on flag values for a data list. This function is used
to keep a small number of boolean flags in an object with
a data list without using any additional space. It is
not generally useful except in circumstances where space
is very tight. (It is used in the base GObject type, for
example.)
the flags to turn on. The values of the flags are
restricted by G_DATALIST_FLAGS_MASK (currently
3; giving two possible boolean flags).
A value for flags that doesn't fit within the mask is
an error.
Turns on flag values for a data list. This function is used to keep a small number of boolean flags in an object with a data list without using any additional space. It is not generally useful except in circumstances where space is very tight. (It is used in the base GObject type, for example.)