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Why is passing rvalue range that is not viewable range to range adaptor allowed in latest compiler?
原标题:

I am learning about ranges and as I learned about range adaptors, they only accept viewable_range as the first argument according to cppreference RangeAdaptorObject.

But when I tested this code on Compiler Explorer:

auto val = std::views::drop(std::vector{1, 2, 3, 4, 5}, 2);

I found that for clang 16.0.0 and gcc 12.0 (both with -std=c++20), this code does compile, while for any older version it does not.

I also tried:

auto val = std::views::transform(std::vector{1, 2, 3, 4, 5}, 2);

This does not compile for any versions of compilers.

So why is it allowed to passing non-viewable_range to some range adaptors in newer version of compiler?

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