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[diff.cpp14.utilities]

C++20 → C++23 1.5 KB 13 lines
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  ### [[utilities]]: general utilities library <a id="diff.cpp14.utilities">[[diff.cpp14.utilities]]</a>
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  **Change:** Constructors taking allocators removed. **Rationale:** No
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  implementation consensus. **Effect on original feature:** Valid C++14
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- code may fail to compile or may change meaning in this International
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- Standard. Specifically, constructing a `std::function` with an allocator
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- is ill-formed and uses-allocator construction will not pass an allocator
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- to `std::function` constructors in this International Standard.
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  **Change:** Different constraint on conversions from `unique_ptr`.
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  **Rationale:** Adding array support to `shared_ptr`, via the syntax
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  `shared_ptr<T[]>` and `shared_ptr<T[N]>`. **Effect on original
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  feature:** Valid C++14 code may fail to compile or may change meaning in
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- this International Standard. For example:
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  ``` cpp
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  #include <memory>
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  std::unique_ptr<int[]> arr(new int[1]);
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  std::shared_ptr<int> ptr(std::move(arr)); // error: int(*)[] is not compatible with int*
 
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  ### [[utilities]]: general utilities library <a id="diff.cpp14.utilities">[[diff.cpp14.utilities]]</a>
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  **Change:** Constructors taking allocators removed. **Rationale:** No
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  implementation consensus. **Effect on original feature:** Valid C++14
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+ code may fail to compile or may change meaning in this revision of C++.
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+ Specifically, constructing a `std::function` with an allocator is
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+ ill-formed and uses-allocator construction will not pass an allocator to
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+ `std::function` constructors in this revision of C++.
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  **Change:** Different constraint on conversions from `unique_ptr`.
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  **Rationale:** Adding array support to `shared_ptr`, via the syntax
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  `shared_ptr<T[]>` and `shared_ptr<T[N]>`. **Effect on original
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  feature:** Valid C++14 code may fail to compile or may change meaning in
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+ this revision of C++. For example:
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  ``` cpp
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  #include <memory>
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  std::unique_ptr<int[]> arr(new int[1]);
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  std::shared_ptr<int> ptr(std::move(arr)); // error: int(*)[] is not compatible with int*