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Adding // DANGER ZONE reminders.

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Ralf W. Grosse-Kunstleve 2021-02-03 13:30:01 -08:00
parent 1e4f0fdcaf
commit 0228080a86
1 changed files with 3 additions and 1 deletions
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4
include/pybind11/detail/init.h
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@ -105,11 +105,13 @@ void construct(value_and_holder &v_h, Cpp<Class> *ptr, bool need_alias) {
// the holder and destruction happens when we leave the C++ scope, and the holder
// class gets to handle the destruction however it likes.
v_h.value_ptr() = ptr;
v_h.set_instance_registered(true); // To prevent init_instance from registering it
v_h.set_instance_registered(true); // SHORTCUT To prevent init_instance from registering it
// DANGER ZONE BEGIN: exceptions will leave v_h in an invalid state.
v_h.type->init_instance(v_h.inst, nullptr); // Set up the holder
Holder<Class> temp_holder(std::move(v_h.holder<Holder<Class>>())); // Steal the holder
v_h.type->dealloc(v_h); // Destroys the moved-out holder remains, resets value ptr to null
v_h.set_instance_registered(false);
// DANGER ZONE END.
construct_alias_from_cpp<Class>(is_alias_constructible<Class>{}, v_h, std::move(*ptr));
} else {