Annex C (informative) Compatibility [diff]

Change: Constructors taking allocators removed.

Rationale: No implementation consensus.

Effect on original feature: Valid C++ 2014 code may fail to compile or may change meaning in this International Standard.

Specifically, constructing a std​::​function with an allocator is ill-formed and uses-allocator construction will not pass an allocator to std​::​function constructors in this International Standard.

Change: Different constraint on conversions from unique_­ptr.

Rationale: Adding array support to shared_­ptr, via the syntax shared_­ptr<T[]> and shared_­ptr<T[N]>.

Effect on original feature: Valid C++ 2014 code may fail to compile or may change meaning in this International Standard.

For example:

#include <memory>
std::unique_ptr<int[]> arr(new int[1]);
std::shared_ptr<int> ptr(std::move(arr));   // error: int(*)[] is not compatible with int*