Affected subclause: [basic.stc.dynamic.deallocation]
New usual (non-placement) deallocator.
Required for sized deallocation.
Effect on original feature: Valid C++ 2011 code can declare a global placement allocation function and
deallocation function as follows:
void* operator new(std::size_t, std::size_t);
void operator delete(void*, std::size_t) noexcept;
In this revision of C++, however, the declaration of operator delete
might match a predefined usual (non-placement)
If so, the
program is ill-formed, as it was for class member allocation functions and
deallocation functions ([expr.new]