Hi !
the question is in the subject, but I can elaborate a bit. I have the set of
all views supported by my application, defined as :
typedef mpl::vector9<
gray8_view_t
, rgb8_view_t, bgr8_view_t, rgba8_view_t, bgra8_view_t
, rgb32f_view_t, bgr32f_view_t, rgba32f_view_t, bgra32f_view_t
>
gil_all_views_t;
typedef any_image_view any_view;
Then I have a function, reading a file and returning an any_image_view, of a
different type :
typedef boost::mpl::vector3 tga_views_t;
typedef boost::gil::any_image_view any_tga_view;
The ' tga_views_t' is a subset of 'gil_all_views_t'.
It seems that I cannot construct an 'any_view' instance, from an
'any_tga_view' ; I receive a bad_cast exception.
Is there an existing function or construct I could use for this ?
If I'm not mistaken, boost::variant (not the gil one) allow such constructs
: it extracts the type of the value contained in the 'foreign' variant, and
assigns this value to the new variant.
Anyone could tell me what is the rationale behind having a special variant
for boost::gil ? performance ? Wouldn't it be easier to replace it by
boost::variant ?
Thanks is advance,
cheers,
Nicolas.
