我正在尝试为mongoc
库编写VAPI。
我已经从struct中创建了一些紧凑的类,其中包含一些与它们相关联的函数。例如,Client
看起来像这样:
[Compact]
[CCode (cname = "mongoc_client_t", free_function = "mongoc_client_destroy", has_type_id = false)]
public class Client {
[CCode (cname = "mongoc_client_new")]
public Client (string uri);
}
我还需要绑定一堆相关的函数。我试图将它们绑定为实例方法,比如:
[CCode (cname = "mongoc_client_get_database")]
public Database get_database (Client client, string dbname);
//Database is another compact class
结果是:
[CCode (cheader_filename = "mongoc.h")]
namespace Mongo {
[Compact]
[CCode (cname = "mongoc_client_t", free_function = "mongoc_client_destroy", has_type_id = false)]
public class Client {
[CCode (cname = "mongoc_client_new")]
public Client (string uri);
[CCode (cname = "mongoc_client_get_database")]
public Database get_database (Client client, string dbname);
}
}
我希望它将第一个client
参数作为调用实例。取而代之的是:
var client = new Client ("uri");
var db = client.get_database (client, "test");
//client is redundant
我想得到这个:
var client = new Client ("uri");
var db = client.get_database ("test");
//The Client instance is passed implicitly
我尝试使用this
、静态方法、instance_pos
和其他调整,但我没有找到让它以这种方式工作的方法。
是否可以在Vala中将实例作为参数隐式传递?如果是这样,我如何绑定VAPI,使实例在没有冗余的情况下隐式传递?
mongoc_client_get_database()
的C API显示函数签名为:
mongoc_database_t * mongoc_client_get_database (mongoc_client_t *client, const char *name);
因此monogc_client_t
是在C API中显式传递的。在Vala中,这是作为C代码中的实例参数自动生成的。您只需要从VAPI:中删除显式参数Client client
[CCode (cheader_filename = "mongoc.h")]
namespace Mongo {
[Compact]
[CCode (cname = "mongoc_client_t", free_function = "mongoc_client_destroy", has_type_id = false)]
public class Client {
[CCode (cname = "mongoc_client_new")]
public Client (string uri);
[CCode (cname = "mongoc_client_get_database")]
public Database get_database (string dbname);
}
}