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Adding vptr_deleter.
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72d1b61176
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@ -9,10 +9,19 @@ struct smart_holder {
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std::shared_ptr<void> vptr;
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const std::type_info* rtti_held;
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const std::type_info* rtti_uqp_del;
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bool have_external_shp;
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bool vptr_deleter_flag;
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template <typename T>
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struct vptr_deleter {
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bool* flag_ptr;
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explicit vptr_deleter(bool* flag_ptr_) : flag_ptr{flag_ptr_} {}
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void operator()(T* raw_ptr) {
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if (*flag_ptr) delete raw_ptr;
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}
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};
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smart_holder()
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: rtti_held{nullptr}, rtti_uqp_del{nullptr}, have_external_shp(false) {}
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: rtti_held{nullptr}, rtti_uqp_del{nullptr}, vptr_deleter_flag{false} {}
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template <typename T>
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void ensure_compatible_rtti(const char* context) {
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@ -30,23 +39,17 @@ struct smart_holder {
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}
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}
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void ensure_unique_ptr_default_deleter(const char* context) {
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void ensure_vptr_deleter_flag_true(const char* context) {
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if (rtti_uqp_del != nullptr) {
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throw std::runtime_error(
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std::string("Cannot disown unique_ptr deleter (") + context + ").");
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}
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}
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void ensure_internal_shared_ptr(const char* context) {
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if (have_external_shp) {
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throw std::runtime_error(
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std::string("Cannot disown external shared_ptr (") + context + ").");
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throw std::runtime_error(std::string("Cannot disown this shared_ptr (") +
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context + ").");
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}
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}
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template <typename T>
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void from_raw_ptr_owned(T* raw_ptr) {
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vptr.reset(raw_ptr);
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vptr_deleter_flag = true;
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vptr.reset(raw_ptr, vptr_deleter<T>(&vptr_deleter_flag));
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rtti_held = &typeid(T);
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}
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@ -55,12 +58,11 @@ struct smart_holder {
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static const char* context = "as_raw_ptr_owned";
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ensure_compatible_rtti<T>(context);
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ensure_use_count_1(context);
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ensure_unique_ptr_default_deleter(context);
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ensure_internal_shared_ptr(context);
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ensure_vptr_deleter_flag_true(context);
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std::shared_ptr<T> tptr = std::static_pointer_cast<T>(vptr);
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vptr.reset();
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T* result = tptr.get();
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// TODO tptr.release();
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vptr_deleter_flag = false;
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return result;
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}
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