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[libc++] Add support for bounded iterators in std::array #110729

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[libc++] Add support for bounded iterators in std::array #110729

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Commits on Nov 5, 2024

  1. [libc++] Add support for bounded iterators in std::array 

    This patch introduces a new kind of bounded iterator that knows the
size of its valid range at compile-time, as in std::array. This allows
computing the end of the range from the start of the range (and the
size) instead of storing the size (or the end of the range) in the
iterator. The iterator wrapper is otherwise identical in design to the
existing __bounded_iter.

Since this requires changing the type of the iterators returned by
std::array, this new bounded iterator is controlled by an ABI flag.

As a drive-by, centralize the tests for std::array::operator[] and
add missing tests for OOB operator[] on non-empty arrays.

Fixes llvm#70864
    @ldionne
    ldionne committed Nov 5, 2024
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  2. Constexpr since C++14

    @ldionne
    ldionne committed Nov 5, 2024
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