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auto-shallow shared_ptr with enable_shared_from_this

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This commit is contained in:
Joachim Schoeberl 2024-01-13 21:15:55 +01:00
parent 54287bbfbb
commit 2d2503bbbb
1 changed files with 21 additions and 0 deletions
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21
libsrc/core/archive.hpp
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@ -42,6 +42,21 @@ namespace ngcore
operator T&() { return val; } operator T&() { return val; }
}; };
// Helper to detect shared_from_this
template <typename T>
class has_shared_from_this2
{
private:
// typedef T* T_ptr;
template <typename C> static std::true_type test(decltype(((C*)nullptr)->shared_from_this()));
template <typename C> static std::false_type test(...);
public:
// If the test returns true_type, then T has shared_from_this
static constexpr bool value = decltype(test<T>(0))::value;
};
#ifdef NETGEN_PYTHON #ifdef NETGEN_PYTHON
pybind11::object CastAnyToPy(const std::any& a); pybind11::object CastAnyToPy(const std::any& a);
#endif // NETGEN_PYTHON #endif // NETGEN_PYTHON
@ -486,6 +501,12 @@ namespace ngcore
template <typename T> template <typename T>
Archive& operator & (std::shared_ptr<T>& ptr) Archive& operator & (std::shared_ptr<T>& ptr)
{ {
if (has_shared_from_this2<T>::value && shallow_to_python)
{
Shallow (ptr);
return *this;
}
if(Output()) if(Output())
{ {
// save -2 for nullptr // save -2 for nullptr