Search the index of an item in a container. Compare by
equality or a lambda. The lack of these have annoyed me for a
long time. Return the index of the first found element or
-1 if no element found.
Currently, only supports random-access operators. Might be
trivially changed for forward iterators.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
In the printing-template code, we loop through a vector and
then determine the index of the current element by searching
the vector. This irks me.
Since looping over a collection with an index is a rather
common theme, implement an enumerating iterator that can
be used as in:
for (auto [idx, item]: enumerated_range(v)) {
...
}
For now, use it for the above vexing case. Convert other
iterations of this theme later.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
The moveInVector() function was defined in qthelper.h, even
though it has nothing to do with Qt. Therefore, move it into
its own header.
Morover, since it is a very low-level function, use snake_case.
And rename it to move_in_range(), because it does not only
work on vectors, but any range with random-access iterators.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
