interface.h File Reference

#include <sys/types.h>

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Data Structures
struct	interface
struct	iface_impl_ptr

Macros
#define	MAX_IFACE   32
#define	IFACE(name)   ((const struct i_##name const*)&i_##name##_impl)
#define	INIT_IFACE(name, ...)   static const struct i_##name i_##name##_impl = {&i_##name,__VA_ARGS__}
#define	NUMARGS(...)   (sizeof((const void*[]){__VA_ARGS__})/sizeof(void*))
#define	INIT_IFACE_IMPL(...)   {NUMARGS(__VA_ARGS__), 0, {__VA_ARGS__}}

Typedefs
typedef const struct interface *	iface_ptr

Functions
iface_ptr	interfaceGet (iface_impl_ptr, const iface_ptr)

Detailed Description

Interface definition code. Each interface is a set of selector functions as well as a data structure where the concrete implementation will be stored. This structure is the intergrated in the class that implements the interface.

Author

Georg Hopp

Copyright

Copyright © 2012 Georg Hopp

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file interface.h.

---

Data Structure Documentation

struct interface

Definition at line 42 of file interface.h.

Collaboration diagram for interface:

Data Fields
const char *	name
const size_t	nmethods

struct iface_impl

Definition at line 48 of file interface.h.

Collaboration diagram for iface_impl_ptr:

Data Fields
const void *	impl[MAX_IFACE]
const size_t	nimpl
char	simpl

Macro Definition Documentation

#define IFACE

(

name

)

((const struct i_##name const*)&i_##name##_impl)

Definition at line 34 of file interface.h.

#define INIT_IFACE	(		name,
			...
	)		static const struct i_##name i_##name##_impl = {&i_##name,__VA_ARGS__}

Definition at line 35 of file interface.h.

#define INIT_IFACE_IMPL

(

...

)

{NUMARGS(__VA_ARGS__), 0, {__VA_ARGS__}}

Definition at line 39 of file interface.h.

#define MAX_IFACE   32

Definition at line 32 of file interface.h.

#define NUMARGS

(

...

)

(sizeof((const void*[]){__VA_ARGS__})/sizeof(void*))

Definition at line 38 of file interface.h.

Typedef Documentation

typedef const struct interface* iface_ptr

Definition at line 46 of file interface.h.

Function Documentation

iface_ptr interfaceGet	(	iface_impl_ptr	iface_impl,
		const iface_ptr	_iface
	)

this one is important in selector functions to get the correct interface implementation of a class.

Definition at line 44 of file interface.c.

References comp(), and TRUE.

{
    const iface_ptr * iface = &_iface;
    iface_ptr *       found;

    if (! iface_impl->simpl) {
        qsort((void**)(iface_impl->impl), iface_impl->nimpl, sizeof(iface_ptr), comp);
        iface_impl->simpl=TRUE;
    }

    found = bsearch(
            &iface,
            iface_impl->impl,
            iface_impl->nimpl,
            sizeof(iface_ptr),
            comp);

    return found? *found : (iface_ptr)NULL;
}

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