[Olena] #230: Inplace arithmetic operators do not guaranty that the type of the target can hold the results
#230: Inplace arithmetic operators do not guaranty that the type of the target can hold the results -----------------------+---------------------------------------------------- Reporter: jacquelet | Owner: Olena Team Type: defect | Status: new Priority: major | Milestone: Olena 1.1 Component: Milena | Version: 1.0 Keywords: | -----------------------+---------------------------------------------------- #include <mln/core/image/image2d.hh> #include <mln/arith/times.hh> #include <mln/arith/minus.hh> #include <mln/value/int_u8.hh> int main() { using namespace mln; typedef mln::value::int_u8 t_int_u8; typedef mln::image2d<t_int_u8> t_img; typedef mln_trait_op_minus_(t_img,t_img) t_minus; typedef mln_trait_op_times_(t_minus,t_minus) t_times; t_img img1; t_img img2; t_img img3; t_minus minus; t_times times; // Loading images ... img3 = img1 - img2; // Does not compile as expected because img1 - img2 is of type t_minus. minus = img1 - img2; // Compile as expected. img3 = minus * minus; // Does not compile as expected because img1 * img2 is of type t_times times = minus * minus; // Compile as expected. // But ... img3 *= (minus - minus); // Compile... But should not! Inplace // operators do not guaranty that the type of // the target can hold the results (in term of // range). } -- Ticket URL: <https://trac.lrde.org/olena/ticket/230> Olena <http://olena.lrde.epita.fr> Olena, a generic and efficient C++ image processing library.
#230: Inplace arithmetic operators do not guaranty that the type of the target can hold the results ------------------------+--------------------------------------------------- Reporter: jacquelet | Owner: Olena Team Type: defect | Status: new Priority: major | Milestone: Olena 1.1 Component: Milena | Version: 1.0 Resolution: | Keywords: ------------------------+--------------------------------------------------- Description changed by lazzara: Old description:
#include <mln/core/image/image2d.hh> #include <mln/arith/times.hh> #include <mln/arith/minus.hh> #include <mln/value/int_u8.hh>
int main() { using namespace mln;
typedef mln::value::int_u8 t_int_u8; typedef mln::image2d<t_int_u8> t_img; typedef mln_trait_op_minus_(t_img,t_img) t_minus; typedef mln_trait_op_times_(t_minus,t_minus) t_times;
t_img img1; t_img img2; t_img img3; t_minus minus; t_times times;
// Loading images ...
img3 = img1 - img2; // Does not compile as expected because img1 - img2 is of type t_minus. minus = img1 - img2; // Compile as expected.
img3 = minus * minus; // Does not compile as expected because img1 * img2 is of type t_times times = minus * minus; // Compile as expected.
// But ... img3 *= (minus - minus); // Compile... But should not! Inplace // operators do not guaranty that the type of // the target can hold the results (in term of // range).
}
New description: {{{ #include <mln/core/image/image2d.hh> #include <mln/arith/times.hh> #include <mln/arith/minus.hh> #include <mln/value/int_u8.hh> int main() { using namespace mln; typedef mln::value::int_u8 t_int_u8; typedef mln::image2d<t_int_u8> t_img; typedef mln_trait_op_minus_(t_img,t_img) t_minus; typedef mln_trait_op_times_(t_minus,t_minus) t_times; t_img img1; t_img img2; t_img img3; t_minus minus; t_times times; // Loading images ... img3 = img1 - img2; // Does not compile as expected because img1 - img2 is of type t_minus. minus = img1 - img2; // Compile as expected. img3 = minus * minus; // Does not compile as expected because img1 * img2 is of type t_times times = minus * minus; // Compile as expected. // But ... img3 *= (minus - minus); // Compile... But should not! Inplace // operators do not guaranty that the type of // the target can hold the results (in term of // range). } }}} -- -- Ticket URL: <https://trac.lrde.org/olena/ticket/230#comment:1> Olena <http://olena.lrde.epita.fr> Olena, a generic and efficient C++ image processing library.
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