Hi, the "nullptr-constructor" for shared_ptr is defined as follows
constexpr shared_ptr<T>::shared_ptr(nullptr_t) : shared_ptr() {}
It is not declared as noexcept even though the default constructor is,
and the implementation is clearly required to just call the default
constructor, which IS declared as noexcept.

I think the "nullptr-constructor" should also be declared noexcept.
Regards,
&rzej


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