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Define void operator delete[](void *p, std::size_t n) in new_delete.cpp #430

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Merged
merged 2 commits into from
May 24, 2021
Merged

Define void operator delete[](void *p, std::size_t n) in new_delete.cpp #430

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Define `void operator delete[](void *p, std::size_t n)` in new_delete…
jonathangjertsen May 21, 2021
45f0785
Only define the sized deallocation functions for C++ versions that ha…
jonathangjertsen May 23, 2021
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10 changes: 8 additions & 2 deletions src/rp2_common/pico_standard_link/new_delete.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,16 @@ void *operator new[](std::size_t n) {
return std::malloc(n);
}

void operator delete(void *p, __unused std::size_t n) noexcept { std::free(p); }

void operator delete(void *p) { std::free(p); }

void operator delete[](void *p) noexcept { std::free(p); }

#if __cpp_sized_deallocation

void operator delete(void *p, __unused std::size_t n) noexcept { std::free(p); }

void operator delete[](void *p, __unused std::size_t n) noexcept { std::free(p); }
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@fivdi fivdi May 22, 2021 •
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The C++ new header only adds the declarations for the sized deallocation functions if __cpp_sized_deallocation is true.

So, should the sized deallocation function that is being added with this PR (and the already existing size deallocation function on line 20) be conditionally compiled using __cpp_sized_deallocation (see here)?

Here is what the new header has:

#if __cpp_sized_deallocation
void operator delete(void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void operator delete[](void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
#endif

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I think it will work either way. I looked up some other implementations of this fix and found one case where the conditional is included (here), and two where it was not (here and here).

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I'm sure it will work too, however, I'm not sure if it's a good idea to make functions intended for C++14 and higher available in C++11.

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Updated


#endif

#endif