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// slang-castable.h
#ifndef SLANG_CASTABLE_H
#define SLANG_CASTABLE_H
#include "../core/slang-com-object.h"
#include "slang-com-helper.h"
#include "slang-com-ptr.h"
namespace Slang
{
// Dynamic cast of ICastable derived types
template<typename T>
SLANG_FORCE_INLINE T* dynamicCast(ICastable* castable)
{
if (castable)
{
void* obj = castable->castAs(T::getTypeGuid());
return obj ? reinterpret_cast<T*>(obj) : ((T*)nullptr);
}
return nullptr;
}
// as style cast
template<typename T>
SLANG_FORCE_INLINE T* as(ICastable* castable)
{
if (castable)
{
void* obj = castable->castAs(T::getTypeGuid());
return obj ? reinterpret_cast<T*>(obj) : ((T*)nullptr);
}
return nullptr;
}
/* An interface for boxing values */
class IBoxValueBase : public ICastable
{
SLANG_COM_INTERFACE(
0x8b4aad81,
0x4934,
0x4a67,
{0xb2, 0xe2, 0xe9, 0x17, 0xfc, 0x29, 0x12, 0x54});
/// Get the contained object
virtual SLANG_NO_THROW void* SLANG_MCALL getValuePtr() = 0;
/// Get the guid that represents the contained ref object
virtual SLANG_NO_THROW SlangUUID SLANG_MCALL getValueTypeGuid() = 0;
};
template<typename T>
class IBoxValue : public IBoxValueBase
{
public:
SLANG_FORCE_INLINE T& get() { return *reinterpret_cast<T*>(getValuePtr()); }
SLANG_FORCE_INLINE T* getPtr() { return reinterpret_cast<T*>(getValuePtr()); }
};
// Cast into a boxed value type
template<typename T>
SLANG_FORCE_INLINE IBoxValue<T>* asBoxValue(ICastable* castable)
{
IBoxValueBase* base = as<IBoxValueBase>(castable);
return (base && base->getValueTypeGuid() == T::getTypeGuid()) ? static_cast<IBoxValue<T>*>(base)
: nullptr;
}
template<typename T>
class BoxValue : public ComBaseObject, public IBoxValue<T>
{
public:
SLANG_COM_BASE_IUNKNOWN_ALL
// ICastable
SLANG_NO_THROW void* SLANG_MCALL castAs(const Guid& guid) SLANG_OVERRIDE;
// IBoxValue
virtual SLANG_NO_THROW void* SLANG_MCALL getValuePtr() SLANG_OVERRIDE { return &m_value; }
virtual SLANG_NO_THROW SlangUUID SLANG_MCALL getValueTypeGuid() SLANG_OVERRIDE
{
return T::getTypeGuid();
}
BoxValue() {}
explicit BoxValue(const T& rhs)
: m_value(rhs)
{
}
protected:
void* getInterface(const Guid& guid);
void* getObject(const Guid& guid);
T m_value;
};
// ------------------------------------------------------------
template<typename T>
void* BoxValue<T>::getInterface(const Guid& guid)
{
if (guid == ISlangUnknown::getTypeGuid() || guid == ICastable::getTypeGuid() ||
guid == IBoxValueBase::getTypeGuid())
{
return static_cast<IBoxValueBase*>(this);
}
return nullptr;
}
// ------------------------------------------------------------
template<typename T>
void* BoxValue<T>::getObject(const Guid& guid)
{
if (guid == T::getTypeGuid())
{
return &m_value;
}
return nullptr;
}
// ------------------------------------------------------------
template<typename T>
void* BoxValue<T>::castAs(const Guid& guid)
{
if (auto ptr = getObject(guid))
{
return ptr;
}
return getInterface(guid);
}
/* Adapter interface to make a non castable types work as ICastable */
class IUnknownCastableAdapter : public ICastable
{
SLANG_COM_INTERFACE(
0x8b4aad81,
0x4934,
0x4a67,
{0xb2, 0xe2, 0xe9, 0x17, 0xfc, 0x29, 0x12, 0x54});
/// When using the adapter, this provides a way to directly get the internal no ICastable type
virtual SLANG_NO_THROW ISlangUnknown* SLANG_MCALL getContained() = 0;
};
/* An adapter such that types which aren't derived from ICastable, can be used as such.
With the following caveats.
* the interfaces/objects of the adapter are checked *first*, so IUnknown will always be for the
adapter
* assumes when doing a queryInterface on the contained item, it will remain in scope when released
(this is *not* strict COM)
*/
class UnknownCastableAdapter : public ComBaseObject, public IUnknownCastableAdapter
{
public:
SLANG_COM_BASE_IUNKNOWN_ALL
// ICastable
SLANG_NO_THROW void* SLANG_MCALL castAs(const Guid& guid) SLANG_OVERRIDE;
// IUnknownCastableAdapter
virtual SLANG_NO_THROW ISlangUnknown* SLANG_MCALL getContained() SLANG_OVERRIDE
{
return m_contained;
}
UnknownCastableAdapter(ISlangUnknown* unk)
: m_contained(unk)
{
SLANG_ASSERT(unk);
}
protected:
void* getInterface(const Guid& guid);
void* getObject(const Guid& guid);
ComPtr<ISlangUnknown> m_contained;
// We hold a cache for a single lookup to make things a little faster
void* m_found = nullptr;
Guid m_foundGuid;
};
struct CastableUtil
{
/// Given an ISlangUnkown return as a castable interface.
/// Can use UnknownCastableAdapter if can't queryInterface unk to ICastable
static ComPtr<ICastable> getCastable(ISlangUnknown* unk);
};
// A way to clone an interface (that derives from IClonable) such that it returns an interface
// of the same type.
template<typename T>
SLANG_FORCE_INLINE ComPtr<T> cloneInterface(T* in)
{
SLANG_ASSERT(in);
// Must be derivable from clonable
IClonable* clonable = in;
// We can clone with the same interface
T* clone = (T*)clonable->clone(T::getTypeGuid());
// Clone must exist
SLANG_ASSERT(clone);
return ComPtr<T>(clone);
}
} // namespace Slang
#endif
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