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What's so hard about constexpr allocation?

Setting the Stage

Today, this is ill-formed, because the allocation persists past the constant evaluation that is the initialization of the global variable p. But we want to change that. I think they can be divided into two categories: attempt to come up with as coherent and safe a solution as possible within the confines of the C++ type system, or trust the programmer. It’ll probably pass most tests that you write, since int* is usable as a constant iterator just fine as long as you don’t try to mutate through it.

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