C++ STL algorithm - erase-remove idiom -- std::remove(_if, _copy_if) | Modern Cpp Series Ep. 154

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►Lesson Description: In this lesson I show you how to remove elements from a container! This is the popular erase-remove idiom that will actually remove elements from a data structure (a common search on stack overflow!). Note that we'll look at 'erase_if' in a later video as well.
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[@yusuke1435]

Great video

[@MikeShah]

Cheers!

[@j1952d]

The remove_if() eliminated the 2 and the 4 !

[@MikeShah]

Timestamp? I'll add in the description notes if there are corrections :)

[@j1952d]

@@MikeShah Around 23 minutes. The 1,2,4,3,8,5,7,6 was reduced to 1,3,8,5,7 at one stage IIRC - I'm out'n'about at present, but I'll check it out later if you want. I'm sure something fishy went on there!

[@MikeShah]

​@@j1952d Looks like remove_if is doing the right thing, but printing it right after is probably a bit misleading (since we should really call erase to remove the elements) probably immediately after the remove_if call. So I think we're just printing one past the end which is probably a bug itself (again, need to erase first) :)

[@j1952d]

@@MikeShah Makes me wonder if some of the algorithms are more trouble than they're worth! Take half a day to learn what you could do in half an hour with a couple of for() loops! Maybe good for very big projects with lots of developers, all having a go at messing it up!. I guess I've been a loner too long.

[@MikeShah]

@@j1952d Most algorithms I think well worth it. Luckily in C++ 20 we finally get erase :) (coming up in the series) en.cppreference.com/w/cpp/container/vector/erase2