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C++: Fix duplicated shared_ptr creation.

This commit is contained in:
Martin Ling 2014-09-02 19:21:11 +01:00 committed by Bert Vermeulen
parent 3bc172a61f
commit 0d0170ae9e
1 changed files with 27 additions and 11 deletions
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38
bindings/cxx/include/libsigrok/libsigrok.hpp
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@ -125,8 +125,7 @@ public:
};
/* Base template for most classes which wrap a struct type from libsigrok. */
template <class Parent, typename Struct> class SR_API StructureWrapper :
public enable_shared_from_this<StructureWrapper<Parent, Struct> >
template <class Parent, typename Struct> class SR_API StructureWrapper
{
protected:
/* Parent object which owns this child object's underlying structure.
@ -144,24 +143,41 @@ protected:
references to both the parent and all its children are gone. */
shared_ptr<Parent> parent;
/* Weak pointer for shared_from_this() implementation. */
weak_ptr<StructureWrapper<Parent, Struct> > weak_this;
public:
shared_ptr<StructureWrapper<Parent, Struct> >
get_shared_pointer(Parent *parent)
/* Note, this implementation will create a new smart_ptr if none exists. */
shared_ptr<StructureWrapper<Parent, Struct> > shared_from_this()
{
if (!parent)
throw Error(SR_ERR_BUG);
this->parent = static_pointer_cast<Parent>(parent->shared_from_this());
return shared_ptr<StructureWrapper<Parent, Struct> >(
this, reset_parent);
shared_ptr<StructureWrapper<Parent, Struct> > shared;
if (!(shared = weak_this.lock()))
{
shared = shared_ptr<StructureWrapper<Parent, Struct> >(
this, reset_parent);
weak_this = shared;
}
return shared;
}
shared_ptr<StructureWrapper<Parent, Struct> >
get_shared_pointer(shared_ptr<Parent> parent)
{
if (!parent)
throw Error(SR_ERR_BUG);
this->parent = parent;
return shared_ptr<StructureWrapper<Parent, Struct> >(
this, reset_parent);
return shared_from_this();
}
shared_ptr<StructureWrapper<Parent, Struct> >
get_shared_pointer(Parent *parent)
{
if (!parent)
throw Error(SR_ERR_BUG);
return get_shared_pointer(static_pointer_cast<Parent>(
parent->shared_from_this()));
}
protected:
static void reset_parent(StructureWrapper<Parent, Struct> *object)