const char *what() const throw();
};
-/* 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> >
+/* Base template for classes whose resources are owned by a parent object. */
+template <class Class, class Parent, typename Struct>
+class SR_API ParentOwned
{
protected:
/* Parent object which owns this child object's underlying structure.
references to both the parent and all its children are gone. */
shared_ptr<Parent> parent;
+ /* Weak pointer for shared_from_this() implementation. */
+ weak_ptr<Class> 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<Class> shared_from_this()
{
- this->parent = static_pointer_cast<Parent>(parent->shared_from_this());
- return shared_ptr<StructureWrapper<Parent, Struct> >(
- this, reset_parent);
+ shared_ptr<Class> shared;
+
+ if (!(shared = weak_this.lock()))
+ {
+ shared = shared_ptr<Class>((Class *) this, reset_parent);
+ weak_this = shared;
+ }
+
+ return shared;
}
- shared_ptr<StructureWrapper<Parent, Struct> >
- get_shared_pointer(shared_ptr<Parent> parent)
+
+
shared_ptr<Class> 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<Class> get_shared_pointer(Parent *parent)
+ {
+ if (!parent)
+ throw Error(SR_ERR_BUG);
+ return get_shared_pointer(parent->shared_from_this());
}
protected:
- static void reset_parent(StructureWrapper<Parent, Struct> *object)
+ static void reset_parent(Class *object)
{
+ if (!object->parent)
+ throw Error(SR_ERR_BUG);
object->parent.reset();
}
Struct *structure;
- StructureWrapper<Parent, Struct>(Struct *structure) :
+ ParentOwned<Class, Parent, Struct>(Struct *structure) :
structure(structure)
{
}
};
/** A hardware driver provided by the library */
-class SR_API Driver : public StructureWrapper<Context, struct sr_dev_driver>
+class SR_API Driver :
+ public ParentOwned<Driver, Context, struct sr_dev_driver>
{
public:
/** Name of this driver. */
/** A real hardware device, connected via a driver */
class SR_API HardwareDevice :
- public StructureWrapper<Context, struct sr_dev_inst>,
+ public ParentOwned<HardwareDevice, Context, struct sr_dev_inst>,
public Device
{
public:
};
/** A channel on a device */
-class SR_API Channel : public StructureWrapper<Device, struct sr_channel>
+class SR_API Channel :
+ public ParentOwned<Channel, Device, struct sr_channel>
{
public:
/** Current name of this channel. */
/** A group of channels on a device, which share some configuration */
class SR_API ChannelGroup :
- public StructureWrapper<Device, struct sr_channel_group>,
+ public ParentOwned<ChannelGroup, Device, struct sr_channel_group>,
public Configurable
{
public:
};
/** A stage in a trigger configuration */
-class SR_API TriggerStage : public StructureWrapper<Trigger, struct sr_trigger_stage>
+class SR_API TriggerStage :
+ public ParentOwned<TriggerStage, Trigger, struct sr_trigger_stage>
{
public:
/** Index number of this stage. */
};
/** A match condition in a trigger configuration */
-class SR_API TriggerMatch : public StructureWrapper<TriggerStage, struct sr_trigger_match>
+class SR_API TriggerMatch :
+ public ParentOwned<TriggerMatch, TriggerStage, struct sr_trigger_match>
{
public:
/** Channel this condition matches on. */
/** Payload of a datafeed header packet */
class SR_API Header :
- public StructureWrapper<Packet, const struct sr_datafeed_header>,
+ public ParentOwned<Header, Packet, const struct sr_datafeed_header>,
public PacketPayload
{
public:
/** Payload of a datafeed metadata packet */
class SR_API Meta :
- public StructureWrapper<Packet, const struct sr_datafeed_meta>,
+ public ParentOwned<Meta, Packet, const struct sr_datafeed_meta>,
public PacketPayload
{
public:
/** Payload of a datafeed packet with logic data */
class SR_API Logic :
- public StructureWrapper<Packet, const struct sr_datafeed_logic>,
+ public ParentOwned<Logic, Packet, const struct sr_datafeed_logic>,
public PacketPayload
{
public:
/** Payload of a datafeed packet with analog data */
class SR_API Analog :
- public StructureWrapper<Packet, const struct sr_datafeed_analog>,
+ public ParentOwned<Analog, Packet, const struct sr_datafeed_analog>,
public PacketPayload
{
public:
/** An input format supported by the library */
class SR_API InputFormat :
- public StructureWrapper<Context, const struct sr_input_module>
+ public ParentOwned<InputFormat, Context, const struct sr_input_module>
{
public:
/** Name of this input format. */
protected:
Input(shared_ptr<Context> context, const struct sr_input *structure);
~Input();
- shared_ptr<Device> get_shared_from_this();
const struct sr_input *structure;
shared_ptr<Context> context;
InputDevice *device;
/** A virtual device associated with an input */
class SR_API InputDevice :
- public StructureWrapper<Input, struct sr_dev_inst>,
+ public ParentOwned<InputDevice, Input, struct sr_dev_inst>,
public Device
{
protected:
/** An output format supported by the library */
class SR_API OutputFormat :
- public StructureWrapper<Context, const struct sr_output_module>
+ public ParentOwned<OutputFormat, Context, const struct sr_output_module>
{
public:
/** Name of this output format. */
projects / libsigrok.git / blobdiff