[gmpi] Re: low level API - Abstract Factory summary
- From: David Olofson <david@xxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 11 Feb 2005 01:58:54 +0100
Then there's this variant, which simply doesn't bother with the
'struct <something>' part at all;
typedef struct
{
struct IGMPI_PluginVtbl *Vtbl;
} IGMPI_Plugin;
As I understand it, this should be legal for the same reason that you
can generate an "instance" of some type without giving the type a
name, as in
struct {
int x;
int y;
} position;
The typedef syntax essentially shifts things one step, so you define a
type where you'd normally generate an instance.
Either way, I've been using it for quite some time on various
platforms with various compilers - even an old Borland compiler for
DOS - without problems. :-)
Anyway, full version:
-----------------------------------------------------------
/*
* GMPI_Plugin interface
*/
typedef struct
{
/* IUnknown methods */
#ifdef MACOSX
/* Part of COM binary standard on Mac */
void *_reserved;
#endif
GMPI_RESULT (*QueryInterface)(IGMPI_Plugin *,
GMPI_GUID *, void **);
int32_t (*AddRef)(IGMPI_Plugin *);
int32_t (*Release)(IGMPI_Plugin *);
/* IGMPI_Plugin methods */
int32_t (*Placeholder1)(IGMPI_Plugin *, int32_t);
int32_t (*Placeholder2)(IGMPI_Plugin *, int32_t *);
} IGMPI_PluginVtable;
typedef struct
{
IGMPI_PluginVtable *Vtable;
} IGMPI_Plugin;
-----------------------------------------------------------
//David Olofson - Programmer, Composer, Open Source Advocate
.- Audiality -----------------------------------------------.
| Free/Open Source audio engine for games and multimedia. |
| MIDI, modular synthesis, real time effects, scripting,... |
`-----------------------------------> http://audiality.org -'
--- http://olofson.net --- http://www.reologica.se ---
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