[diff.cpp23.mem]

# Annex C (informative) Compatibility [[diff]](./#diff)

## C.1 C++ and ISO C++ 2023 [[diff.cpp23]](diff.cpp23#mem)

### C.1.7 [[mem]](mem "20 Memory management library"): memory management library [diff.cpp23.mem]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L278)

**Affected subclause:** [[c.malloc]](c.malloc)  


**Change:** Calling realloc with a non-null pointer and zero size
has erroneous behavior[.](#1.sentence-1)

  


**Rationale:** The C standard library does not define this behavior[.](#1.sentence-2)

  


**Effect on original feature:** Valid C++ 2023 code that calls realloc with a non-null pointer and a size of zero is erroneous and may change behavior[.](#1.sentence-3)