[all-commits] [llvm/llvm-project] d9caea: [libc++][ranges] LWG3564: `transform_view::iterato...

[Xiaoyang Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d9caea18f946390e0b458471cdc3e3252099c1cf
      https://github.com/llvm/llvm-project/commit/d9caea18f946390e0b458471cdc3e3252099c1cf
  Author: Xiaoyang Liu <siujoeng.lau at gmail.com>
  Date:   2024-08-12 (Mon, 12 Aug 2024)

  Changed paths:
    M libcxx/docs/Status/Cxx23Issues.csv
    M libcxx/include/__ranges/transform_view.h
    M libcxx/test/std/ranges/range.adaptors/range.transform/iterator/types.pass.cpp
    M libcxx/test/std/ranges/range.adaptors/range.transform/types.h

  Log Message:
  -----------
  [libc++][ranges] LWG3564: `transform_view::iterator<true>::value_type` and `iterator_category` should use `const F&` (#91816)

## Introduction

This patch implements LWG3564:
`transform_view::iterator<true>::value_type` and `iterator_category`
should use `const F&`.

`transform_view`'s iterator currently obtained from a `const
transform_view` invoke the transformation function as `const`, but the
`value_type` and `iterator_category` determination uses non-`const`
`F&`.

## Reference

-
[[range.transform.iterator]](https://eel.is/c++draft/range.transform.iterator)
- [LWG3564](https://cplusplus.github.io/LWG/issue3564)



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