Allow nonconstructible holders#2067

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pd-robgee wants to merge 6 commits intopybind:masterfrom

pd-robgee:allow-nonconstructible-holders

Commits on Nov 10, 2017

Don't attempt to constructor an impossible shared_ptr
jagerman
committed

Commits on Jan 13, 2020

Merge remote-tracking branch 'pybind/master' into allow-nonconstructible-holders
Röbke Geenen
committed
Use init_shared_holder_from_pointer() also for variant 2: 'try to construct from existing holder object, if possible'
Röbke Geenen
committed
Only check destructibility for shared_ptr holder, non-destructibility with another holder type should still be a compile error.
Röbke Geenen
committed
Added test cases for types with non-public destructor in a shared_ptr holder.
Röbke Geenen
committed

Commits on Jan 14, 2020

Fix: MSVC does not like enable_if_t = 0.
Röbke Geenen
committed