自学教程：C++ EINA_SAFETY_ON_NULL_RETURN_VAL函数代码示例

Ewk_JS_Object* ewk_js_object_new(const Ewk_JS_Class_Meta* jsMetaClass){#if ENABLE(NETSCAPE_PLUGIN_API)    Ewk_JS_Object* object;    EINA_SAFETY_ON_NULL_RETURN_VAL(jsMetaClass, 0);    object = static_cast<Ewk_JS_Object*>(malloc(sizeof(Ewk_JS_Object)));    if (!object) {        ERR("Could not allocate memory for ewk_js_object");        return 0;    }    EINA_MAGIC_SET(object, EWK_JS_OBJECT_MAGIC);    object->cls = ewk_js_class_new(jsMetaClass);    object->view = 0;    object->name = 0;    object->type = EWK_JS_OBJECT_OBJECT;    if (eina_hash_population(object->cls->properties) < 25)        object->properties = eina_hash_string_small_new(reinterpret_cast<Eina_Free_Cb>(ewk_js_variant_free));    else        object->properties = eina_hash_string_superfast_new(reinterpret_cast<Eina_Free_Cb>(ewk_js_variant_free));    for (int i = 0; object->cls->meta->properties && object->cls->meta->properties[i].name; i++) {        Ewk_JS_Property prop = object->cls->meta->properties[i];        const char* key = object->cls->meta->properties[i].name;        Ewk_JS_Variant* value = static_cast<Ewk_JS_Variant*>(malloc(sizeof(Ewk_JS_Variant)));        if (!value) {            ERR("Could not allocate memory for ewk_js_variant");            goto error;        }        if (prop.get)            prop.get(object, key, value);        else {            value->type = prop.value.type;            switch (value->type) {            case EWK_JS_VARIANT_VOID:            case EWK_JS_VARIANT_NULL:                value->value.o = 0;                break;            case EWK_JS_VARIANT_STRING:                value->value.s = eina_stringshare_add(prop.value.value.s);                break;            case EWK_JS_VARIANT_BOOL:                value->value.b = prop.value.value.b;                break;            case EWK_JS_VARIANT_INT32:                value->value.i = prop.value.value.i;                break;            case EWK_JS_VARIANT_DOUBLE:                value->value.d = prop.value.value.d;                break;            case EWK_JS_VARIANT_OBJECT:                value->value.o = prop.value.value.o;                break;            }        }        eina_hash_add(object->properties, key, value);    }    object->base.object.referenceCount = 1;    object->base.object._class = &EWK_NPCLASS;    return object;error:    ewk_js_object_free(object);    return 0;#else    UNUSED_PARAM(jsMetaClass);    return 0;#endif}

EAPI Eolian_Function_Typeeolian_function_type_get(const Eolian_Function *fid){   EINA_SAFETY_ON_NULL_RETURN_VAL(fid, EOLIAN_UNRESOLVED);   return fid->type;}

EAPI unsigned intefreet_desktop_category_count_get(Efreet_Desktop *desktop){    EINA_SAFETY_ON_NULL_RETURN_VAL(desktop, 0);    return eina_list_count(desktop->categories);}

EAPI const Eolian_Implement *eolian_function_implement_get(const Eolian_Function *fid){   EINA_SAFETY_ON_NULL_RETURN_VAL(fid, NULL);   return fid->impl;}

EAPI Eina_Booleolian_function_object_is_const(const Eolian_Function *fid){   EINA_SAFETY_ON_NULL_RETURN_VAL(fid, EINA_FALSE);   return fid->obj_is_const;}

const char* ewk_context_menu_item_title_set(Ewk_Context_Menu_Item* o, const char* title){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, 0);    eina_stringshare_replace(&o->title, title);    return o->title;}

Eina_Bool ewk_context_menu_item_enabled_set(Ewk_Context_Menu_Item *o, Eina_Bool enabled){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EINA_FALSE);    o->enabled = enabled;    return EINA_TRUE;}

EAPI Eolian_Typedecl_Typeeolian_typedecl_type_get(const Eolian_Typedecl *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, EOLIAN_TYPEDECL_UNKNOWN);   return tp->type;}

EAPI Eina_Booleolian_typedecl_is_extern(const Eolian_Typedecl *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, EINA_FALSE);   return tp->is_extern;}

EAPI const Eolian_Type *eolian_typedecl_base_type_get(const Eolian_Typedecl *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, NULL);   return tp->base_type;}

EAPI Eina_Booleolian_type_is_ptr(const Eolian_Type *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, EINA_FALSE);   return tp->is_ptr;}

EAPI Eolian_Type_Builtin_Typeeolian_type_builtin_type_get(const Eolian_Type *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, EOLIAN_TYPE_BUILTIN_INVALID);   return tp->btype;}

EAPI const Eolian_Type *eolian_type_next_type_get(const Eolian_Type *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, NULL);   return tp->next_type;}

EAPI const Eolian_Documentation *eolian_typedecl_documentation_get(const Eolian_Typedecl *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, NULL);   return tp->doc;}

Eina_Bool ewk_context_menu_item_action_set(Ewk_Context_Menu_Item* o, Ewk_Context_Menu_Action action){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EINA_FALSE);    o->action = action;    return EINA_TRUE;}

EAPI Eina_Stringshare *eolian_typedecl_free_func_get(const Eolian_Typedecl *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, NULL);   return tp->freefunc;}

const char* ewk_context_menu_item_title_get(Ewk_Context_Menu_Item* o){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, 0);    return o->title;}

EAPI const Eolian_Documentation *eolian_typedecl_struct_field_documentation_get(const Eolian_Struct_Type_Field *fl){   EINA_SAFETY_ON_NULL_RETURN_VAL(fl, NULL);   return fl->doc;}

Eina_Bool ewk_context_menu_item_enabled_get(Ewk_Context_Menu_Item* o){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EINA_FALSE);    return o->enabled;}

EAPI const Eolian_Type *eolian_typedecl_struct_field_type_get(const Eolian_Struct_Type_Field *fl){   EINA_SAFETY_ON_NULL_RETURN_VAL(fl, NULL);   return fl->type;}

const Eina_List* ewk_context_menu_item_list_get(Ewk_Context_Menu* o){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, 0);    return o->items;}

EAPI Eolian_Type_Typeeolian_type_type_get(const Eolian_Type *tp){   EINA_SAFETY_ON_NULL_RETURN_VAL(tp, EOLIAN_TYPE_UNKNOWN_TYPE);   return tp->type;}

EAPI Eina_Booleolian_function_is_class(const Eolian_Function *fid){   EINA_SAFETY_ON_NULL_RETURN_VAL(fid, EINA_FALSE);   return fid->is_class;}

Ewk_Context_Menu_Item_Type ewk_context_menu_item_type_get(Ewk_Context_Menu_Item* o){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EWK_ACTION_TYPE);    return o->type;}

EAPI const Eolian_Class *eolian_function_class_get(const Eolian_Function *fid){   EINA_SAFETY_ON_NULL_RETURN_VAL(fid, NULL);   return fid->klass;}

Eina_Bool ewk_context_menu_item_type_set(Ewk_Context_Menu_Item* o, Ewk_Context_Menu_Item_Type type){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EINA_FALSE);    o->type = type;    return EINA_TRUE;}

char *esql_string_escape(Eina_Bool   backslashes,                   const char *s){    char *ret, *rp;    const char *p;    if (!s) return NULL;    ret = malloc(sizeof(char) * strlen(s) * 2 + 1);    EINA_SAFETY_ON_NULL_RETURN_VAL(ret, NULL);    if (!backslashes) /* no backslashes allowed, so just double up single quotes */    {        for (p = s, rp = ret; *p; p++, rp++)        {            if (*p == '/'')            {                *rp = '/'';                rp++;            }            *rp = *p;        }    }    else    {        for (p = s, rp = ret; *p; p++, rp++)        {            char e = 0;            switch (*p)            {            case '/'':            case '//':            case '"':                e = *p;                break;            case '/n':                e = 'n';                break;            case '/r':                e = 'r';                break;            case '/0':                e = '0';                break;            default:                *rp = *p;                continue;            }            *rp++ = '//';            *rp = e;        }    }    *rp = 0;    return ret;}

Ewk_Context_Menu_Action ewk_context_menu_item_action_get(Ewk_Context_Menu_Item* o){    EINA_SAFETY_ON_NULL_RETURN_VAL(o, EWK_CONTEXT_MENU_ITEM_TAG_NO_ACTION);    return o->action;}

EAPI void *efreet_desktop_type_data_get(Efreet_Desktop *desktop){    EINA_SAFETY_ON_NULL_RETURN_VAL(desktop, NULL);    return desktop->type_data;}