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[smart_holder] Support loading unique_ptr<Derived> as unique_ptr<Base>.#4031

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Merged
rwgk merged 6 commits into from
Jun 28, 2022
Merged

[smart_holder] Support loading unique_ptr<Derived> as unique_ptr<Base>. #4031

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6b41742
Support loading unique_ptr<derived> as unique_ptr<base>.
wangxf123456 Jun 27, 2022
dd97088
Fix incorrect test
wangxf123456 Jun 28, 2022
1b983c6
pre commit fix
wangxf123456 Jun 28, 2022
0e2fa2e
Fix clang tidy
wangxf123456 Jun 28, 2022
511cbbf
Resolve comments
wangxf123456 Jun 28, 2022
85fd46e
Resolve comments
wangxf123456 Jun 28, 2022
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4 changes: 3 additions & 1 deletion include/pybind11/detail/smart_holder_poc.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -181,7 +181,9 @@ struct smart_holder {
+ ").");
}
ensure_vptr_is_using_builtin_delete(context);
} else if (!(*rtti_requested == *rtti_uqp_del)) {
} else if (!(*rtti_requested == *rtti_uqp_del)
&& !(vptr_is_using_builtin_delete
&& is_std_default_delete<T>(*rtti_requested))) {
throw std::invalid_argument(std::string("Incompatible unique_ptr deleter (") + context
+ ").");
}
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28 changes: 28 additions & 0 deletions tests/pure_cpp/smart_holder_poc_test.cpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -37,6 +37,15 @@ struct indestructible_int {
~indestructible_int() = default;
};

struct base {
virtual int get() { return 10; }
virtual ~base() = default;
};

struct derived : public base {
int get() override { return 100; }
};

} // namespace helpers

TEST_CASE("from_raw_ptr_unowned+as_raw_ptr_unowned", "[S]") {
Expand DownExpand Up@@ -227,6 +236,25 @@ TEST_CASE("from_unique_ptr+as_shared_ptr", "[S]") {
REQUIRE(*new_owner == 19);
}

TEST_CASE("from_unique_ptr_derived+as_unique_ptr_base", "[S]") {
std::unique_ptr<helpers::derived> orig_owner(new helpers::derived());
auto hld = smart_holder::from_unique_ptr(std::move(orig_owner));
REQUIRE(orig_owner.get() == nullptr);
std::unique_ptr<helpers::base> new_owner = hld.as_unique_ptr<helpers::base>();
REQUIRE(!hld.has_pointee());
REQUIRE(new_owner->get() == 100);
}

TEST_CASE("from_unique_ptr_derived+as_unique_ptr_base2", "[E]") {
std::unique_ptr<helpers::derived, helpers::functor_other_delete<helpers::derived>> orig_owner(
new helpers::derived());
auto hld = smart_holder::from_unique_ptr(std::move(orig_owner));
REQUIRE(orig_owner.get() == nullptr);
REQUIRE_THROWS_WITH(
(hld.as_unique_ptr<helpers::base, helpers::functor_builtin_delete<helpers::base>>()),
"Incompatible unique_ptr deleter (as_unique_ptr).");
}

TEST_CASE("from_unique_ptr_with_deleter+as_lvalue_ref", "[S]") {
std::unique_ptr<int, helpers::functor_builtin_delete<int>> orig_owner(new int(19));
auto hld = smart_holder::from_unique_ptr(std::move(orig_owner));
Expand Down