c++23 std::from_range form of vector constructor

[Thomas Sepez]

I would like to advocate for adoption of the std::vector<>(std::from_range, R&&) constructor.

In some sense, the two-argument iterator constructor should be considered UNSAFE BUFFER USAGE, because there is no reason to believe that we have specificied iterators into the same container.  

Ranges avoid this issue, and would provide an "out" should we determine the two-arg constructor to actuall be considered unsafe.

Thanks Heaps!

[Joe Mason]

There's a general proposal to allow std::from_range. You might as well comment there.

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[Thomas Sepez]

Sure, sorry didn't see that. Where is that general proposal?  I was just looking at https://chromium.googlesource.com/chromium/src/+/main/styleguide/c++/c++-features.md#Constructing-containers-with-std_from_range-tbd

[Daniel Cheng]

The other thread is https://groups.google.com/a/chromium.org/g/cxx/c/ZzSLYf6-KwQ

Daniel

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