Roland Conybeare
820f431d66
git-subtree-dir: xo-reflect git-subtree-mainline:8111f3846cgit-subtree-split:5dce303fe1
85 lines
3 KiB
C++
85 lines
3 KiB
C++
/* file PointerTdx.hpp
|
|
*
|
|
* author: Roland Conybeare, Sep 2022
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "xo/reflect/TypeDescrExtra.hpp"
|
|
#include "xo/reflect/EstablishTypeDescr.hpp"
|
|
#include "xo/indentlog/scope.hpp"
|
|
|
|
namespace xo {
|
|
namespace reflect {
|
|
/* Extra type-associated information for a pointer-like type
|
|
*
|
|
* Treat a pointer as a container that has 0 or 1 children;
|
|
* - 0 children if null
|
|
* - 1 child otherwise
|
|
*/
|
|
class PointerTdx : public TypeDescrExtra {
|
|
public:
|
|
// ----- Inherited from TypeDescrExtra -----
|
|
|
|
virtual Metatype metatype() const override { return Metatype::mt_pointer; }
|
|
virtual uint32_t n_child(void * object) const override = 0;
|
|
|
|
/* number of children unknown at compile time.
|
|
* null-pointer -> 0, non-null pointer -> 1
|
|
*/
|
|
virtual uint32_t n_child_fixed() const override { return 0; /*unknown*/ }
|
|
virtual TaggedPtr child_tp(uint32_t i, void * object) const override = 0;
|
|
/* (forbidden) */
|
|
virtual std::string const & struct_member_name(uint32_t i) const override;
|
|
}; /*PointerTdx*/
|
|
|
|
// ----- RefPointerTdx -----
|
|
|
|
/* Pointer = xo::ref::intrusive_ptr<T> for some T */
|
|
template<typename Pointer>
|
|
class RefPointerTdx : public PointerTdx {
|
|
public:
|
|
using target_t = Pointer;
|
|
|
|
static std::unique_ptr<RefPointerTdx> make() {
|
|
return std::unique_ptr<RefPointerTdx>(new RefPointerTdx());
|
|
} /*make*/
|
|
|
|
virtual uint32_t n_child(void * object) const override {
|
|
/* e.g:
|
|
* target_t = ref::rp<filter::KalmanFilterState>
|
|
*/
|
|
target_t * ptr = reinterpret_cast<target_t *>(object);
|
|
|
|
if (*ptr)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
} /*n_child*/
|
|
|
|
virtual TypeDescrBase * fixed_child_td(uint32_t /*i*/) const override {
|
|
return EstablishTypeDescr::establish<typename Pointer::element_type>();
|
|
}
|
|
|
|
virtual TaggedPtr child_tp(uint32_t i, void * object) const override {
|
|
using xo::tostr;
|
|
using xo::xtag;
|
|
|
|
target_t * ptr = reinterpret_cast<target_t *>(object);
|
|
|
|
if (i > 0) {
|
|
throw std::runtime_error(tostr("RefPointerTdx<T>::child_tp"
|
|
": attempt to fetch child #i from a ref::rp<T>",
|
|
xtag("T", type_name<target_t>()),
|
|
xtag("i", i),
|
|
xtag("n", this->n_child(object))));
|
|
}
|
|
|
|
return establish_most_derived_tp(ptr->get());
|
|
} /*child_tp*/
|
|
}; /*RefPointerTdx*/
|
|
|
|
} /*namespace reflect*/
|
|
} /*namespace xo*/
|
|
|
|
/* end PointerTdx.hpp */
|