<div dir="ltr">I should add that one of my actual use cases is to take a list of unknown length and chunk it into a list of fixed sized vectors.<div><br></div><div>I use fromListN which allows me to fill a vector up until N and then I move onto the next one etc until the list is exhausted.</div><div><br></div><div>Requiring an exact N is a pessimisation for me because it would force me to create intermediate lists of the desired size before calling fromListN.</div><div><br></div><div>I do not mind if a function with the current behaviour exists but with a different name like fromListUntilN or something similar.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 28 Feb 2020 at 16:58, John Ky <<a href="mailto:newhoggy@gmail.com">newhoggy@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>I expect it to pre-allocate space for N elements and populate the vector until there are no more elements or the vector is full and return a vector that has a size the minimum of the length of the input list and N.</div><div dir="auto"><br></div><div dir="auto">To me size hint is definitely not what I want because it hides performance/allocation bugs.</div><div dir="auto"><br></div><div dir="auto">If it is possible to modify the function type then I would have it return a tuple of a vector with maximum size N as well as the remainder of the list.<br><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Fri, 28 Feb 2020, 2:41 pm Zemyla, <<a href="mailto:zemyla@gmail.com" target="_blank">zemyla@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">I'm kind of the opposite. I think the number given to fromListN should be a "size hint", not a redundant coding of the size of the list given.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 27, 2020, 21:31 chessai . <<a href="mailto:chessai1996@gmail.com" rel="noreferrer" target="_blank">chessai1996@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">I expect a list with precisely length N, and reject anything else. IIRC both primitive and vector do this</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 27, 2020, 6:54 PM Carter Schonwald <<a href="mailto:carter.schonwald@gmail.com" rel="noreferrer noreferrer" target="_blank">carter.schonwald@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hey everyone: </div><div dir="auto">When you see fromListN as a function in a library, do you assume / presume it’s expecting an exactly N element list ? Or do you expect/tolerate other behavior ? </div><div dir="auto"><br></div><div dir="auto">Should it reject shorter lists?</div><div dir="auto"><br></div><div dir="auto">Should it truncate or reject longer lists? </div><div dir="auto"><br></div><div dir="auto">A corner case of this came up in some bug discussion I was having regarding vector, and I shall claim and or presume that most folks assume exact size with prompt rejection of too long or too short. </div><div dir="auto"><br></div><div dir="auto">Thoughts please ?</div><div dir="auto"><br></div><div dir="auto">-Carter </div>
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