[libcxx-commits] [PATCH] D68364: Implement C++20's P0784 (More constexpr containers)

[Jonathan Wakely via Phabricator via libcxx-commits]

jwakely added a comment.

In D68364#2293971 <https://reviews.llvm.org/D68364#2293971>, @leonardchan wrote:

> Is there a recommended way for working around this? We're using GCC 10.2.1. Thanks.

I don't think your implementation is valid. I think P0784 only allows new-expressions and calls to `std::allocator::allocate` in constexpr functions, not calls to `operator new`.

Can you use something like `if (__builtin_is_constant_evaluated() return new unsigned char[n];` and the equivalent in the corresponding deallocation function.


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