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Add DANGER ZONE comment in detail/init.h, similar to a comment added on the smart_holder branch (all the way back in 2021).

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Ralf W. Grosse-Kunstleve 2024-07-18 01:25:36 -07:00
parent 54fd559117
commit 92d7724de4
1 changed files with 4 additions and 2 deletions
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6
include/pybind11/detail/init.h
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@ -128,11 +128,13 @@ 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.type->init_instance(v_h.inst, nullptr); // Set up the holder
v_h.set_instance_registered(true); // Trick 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 {