Populate a vector with all multimap values with a given key

Question

Given a multimap M what\'s a neat way to create a vector of all values in M with a specific key.

e.g given a multimap how c

Answer 1

You could initialise the vector by giving it two iterators, like this:

std::multimap bar;

...

std::vector > foo(bar.lower_bound("123"), bar.upper_bound("123"));

but that would give you a vector of pairs (ie, with both the key and value).

Another option would be to use std::copy with something like a back_inserter, which is another way to hide the loop, but with the same downside as above.

std::copy(bar.lower_bound("123"), bar.upper_bound("123"), std::back_inserter(foo));

This would append the elements (if any) to the vector foo.

For extracting the values only, I can't think of any way but to loop over the results as I'm not aware of a standard way to get only the value out of a range.