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Adding vptr_deleter.

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This commit is contained in:
Ralf W. Grosse-Kunstleve 2021-01-05 10:38:00 -08:00
parent 72d1b61176
commit d1f94e498d
1 changed files with 18 additions and 16 deletions
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34
include/pybind11/smart_holder_poc.h
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@ -9,10 +9,19 @@ struct smart_holder {
std::shared_ptr<void> vptr;
const std::type_info* rtti_held;
const std::type_info* rtti_uqp_del;
bool have_external_shp;
bool vptr_deleter_flag;
template <typename T>
struct vptr_deleter {
bool* flag_ptr;
explicit vptr_deleter(bool* flag_ptr_) : flag_ptr{flag_ptr_} {}
void operator()(T* raw_ptr) {
if (*flag_ptr) delete raw_ptr;
}
};
smart_holder()
: rtti_held{nullptr}, rtti_uqp_del{nullptr}, have_external_shp(false) {}
: rtti_held{nullptr}, rtti_uqp_del{nullptr}, vptr_deleter_flag{false} {}
template <typename T>
void ensure_compatible_rtti(const char* context) {
@ -30,23 +39,17 @@ struct smart_holder {
}
}
void ensure_unique_ptr_default_deleter(const char* context) {
void ensure_vptr_deleter_flag_true(const char* context) {
if (rtti_uqp_del != nullptr) {
throw std::runtime_error(
std::string("Cannot disown unique_ptr deleter (") + context + ").");
}
}
void ensure_internal_shared_ptr(const char* context) {
if (have_external_shp) {
throw std::runtime_error(
std::string("Cannot disown external shared_ptr (") + context + ").");
throw std::runtime_error(std::string("Cannot disown this shared_ptr (") +
context + ").");
}
}
template <typename T>
void from_raw_ptr_owned(T* raw_ptr) {
vptr.reset(raw_ptr);
vptr_deleter_flag = true;
vptr.reset(raw_ptr, vptr_deleter<T>(&vptr_deleter_flag));
rtti_held = &typeid(T);
}
@ -55,12 +58,11 @@ struct smart_holder {
static const char* context = "as_raw_ptr_owned";
ensure_compatible_rtti<T>(context);
ensure_use_count_1(context);
ensure_unique_ptr_default_deleter(context);
ensure_internal_shared_ptr(context);
ensure_vptr_deleter_flag_true(context);
std::shared_ptr<T> tptr = std::static_pointer_cast<T>(vptr);
vptr.reset();
T* result = tptr.get();
// TODO tptr.release();
vptr_deleter_flag = false;
return result;
}