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Ralf W. Grosse-Kunstleve 2021-06-15 19:42:08 -07:00 committed by Ralf W. Grosse-Kunstleve
parent 5bb38c10b3
commit e80a1f0617
1 changed files with 37 additions and 14 deletions
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47
include/pybind11/detail/smart_holder_poc.h
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@ -56,14 +56,32 @@ Details:
namespace pybindit {
namespace memory {
struct guarded_delete {
void (*del_ptr)(void *);
bool armed_flag;
guarded_delete(void (*del_ptr)(void *), bool armed_flag)
: del_ptr{del_ptr}, armed_flag{armed_flag} {}
void operator()(void *raw_ptr) const {
if (armed_flag)
(*del_ptr)(raw_ptr);
struct guarded_operator_call {
std::shared_ptr<bool> flag_ptr;
explicit guarded_operator_call(std::shared_ptr<bool> armed_flag_ptr)
: flag_ptr{armed_flag_ptr} {}
virtual void operator()(void *) { std::terminate(); };
virtual ~guarded_operator_call() = default;
};
template <typename T>
struct guarded_builtin_delete : guarded_operator_call {
explicit guarded_builtin_delete(std::shared_ptr<bool> armed_flag_ptr)
: guarded_operator_call(armed_flag_ptr) {}
void operator()(void *raw_ptr) override { delete_impl<T>(raw_ptr); }
template <typename T_ = T,
typename std::enable_if<std::is_destructible<T_>::value, int>::type = 0>
void delete_impl(void *raw_ptr) {
if (*flag_ptr)
delete (T *) raw_ptr;
}
template <typename T_ = T,
typename std::enable_if<!std::is_destructible<T_>::value, int>::type = 0>
void delete_impl(void *) {
// This noop operator is needed to avoid a compilation error (for `delete raw_ptr;`), but
// throwing an exception from here could std::terminate the process. Therefore the runtime
// check for lifetime-management correctness is implemented elsewhere (in
// ensure_pointee_is_destructible()).
}
};
@ -86,13 +104,18 @@ guarded_delete make_guarded_builtin_delete(bool armed_flag) {
}
template <typename T, typename D>
inline void custom_delete(void *raw_ptr) {
struct guarded_custom_deleter : guarded_operator_call {
explicit guarded_custom_deleter(std::shared_ptr<bool> armed_flag_ptr)
: guarded_operator_call(armed_flag_ptr) {}
virtual void operator()(void *raw_ptr) override {
if (*flag_ptr)
D()((T *) raw_ptr);
}
template <typename T, typename D>
guarded_delete make_guarded_custom_deleter(bool armed_flag) {
return guarded_delete(custom_delete<T, D>, armed_flag);
guarded_custom_deleter(guarded_custom_deleter &&) = default;
guarded_custom_deleter(guarded_custom_deleter &) = delete;
guarded_custom_deleter &operator=(guarded_custom_deleter &&) = delete;
guarded_custom_deleter &operator=(const guarded_custom_deleter &) = delete;
};
template <typename T>