gvcext.h

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/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

/* Common header used by both clients and plugins */

#ifndef GVCEXT_H
#define GVCEXT_H

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Define an apis array of name strings using an enumerated api_t as index.
 * The enumerated type is defined here.  The apis array is
 * inititialized in gvplugin.c by redefining ELEM and reinvoking APIS.
 */
#define APIS ELEM(render) ELEM(layout) ELEM(textlayout) ELEM(device) ELEM(loadimage)

/*
 * Define api_t using names based on the plugin names with API_ prefixed.
 */
#define ELEM(x) API_##x,
    typedef enum { APIS _DUMMY_ELEM_=0 } api_t; /* API_render, API_layout, ... */
                        /* Stupid but true: The sole purpose of "_DUMMY_ELEM_=0"
                         * is to avoid a "," after the last element of the enum
                         * because some compilers when using "-pedantic"
                         * generate an error for about the dangling ","
                         * but only if this header is used from a .cpp file!
                         * Setting it to 0 makes sure that the enumeration
                         * does not define an extra value.  (It does however
                         * define _DUMMY_ELEM_ as an enumeration symbol,
                         * but its value duplicates that of the first
                         * symbol in the enumeration - in this case "render".)
                         */

                        /* One could wonder why trailing "," in:
                         *      int nums[]={1,2,3,};
                         * is OK, but in:
                         *      typedef enum {a,b,c,} abc_t; 
                         * is not!!!
                         */
#undef ELEM

    typedef struct GVJ_s GVJ_t;
    typedef struct GVG_s GVG_t;
    typedef struct GVC_s GVC_t;

    typedef struct {
        const char *name;
        void* address;
    } lt_symlist_t;

    typedef struct gvplugin_available_s gvplugin_available_t;

/*visual studio*/
#ifdef _WIN32
#ifndef GVC_EXPORTS
__declspec(dllimport) lt_symlist_t lt_preloaded_symbols[];
#else
//__declspec(dllexport) lt_symlist_t lt_preloaded_symbols[];
#if !defined(LTDL_H)
lt_symlist_t lt_preloaded_symbols[];
#endif
#endif
#endif
/*end visual studio*/


#ifndef _WIN32
#if defined(GVDLL)
        __declspec(dllexport) lt_symlist_t lt_preloaded_symbols[];
#else
#if !defined(LTDL_H)
        extern lt_symlist_t lt_preloaded_symbols[];
#endif
#endif
#endif


#ifdef __cplusplus
}
#endif



#endif