Nebula2探秘05-RTTI
happykevins文
Nebula2的RTTI支持都是在nObject这一层实现的，每个继承自nObject的类都有IsA()和IsInstanceof()两个方法，前者用于判断继承关系，后者则用于判断一个对象是否为指定类的实例，下面的代码说明了他们的用法。
/****************************************************************************/
/* Nebula2 - Tutorial 05 */
/* Nebula2 RTTI */
/* author: happykevins */
/****************************************************************************/
///----------------------------------------------------------------------------
/// +必要头文件
#include "kernel/nkernelserver.h"
#include "kernel/ntimeserver.h"
#include "kernel/nfileserver2.h"
/// -必要头文件
///----------------------------------------------------------------------------
///----------------------------------------------------------------------------
/// +链接库
#pragma comment(lib, "wsock32.lib")
#pragma comment(lib, "d_nkernel.lib")
/// -链接库
///----------------------------------------------------------------------------
///----------------------------------------------------------------------------
/// +Application
int main(int argc, const char** argv)
{
/// 创建KernelServer
nKernelServer* ks = n_new(nKernelServer);
///----------------------------------------------------------------------------
/// +Nebula2 RTTI Test
/// @note:
/// Nebula2 RTTI implement mostly depends on nClass && nObject
/// firstly: we got some instance (all inherited from nObject)
nRoot* nroot = (nRoot*)ks->New("nroot");
nObject* nobject = (nObject*)ks->New("nobject");
nTimeServer* ntimeserver = (nTimeServer*)ks->Lookup("/sys/servers/time");
nFileServer2* nfileserver2 = (nFileServer2*)ks->Lookup("/sys/servers/file2");
/// secondly: Test RTTI Info.
/// use 'IsA' & 'IsInstanceOf' methods
// 1. nroot is a nroot?
n_printf("[%s] is %s [%s] ",
nroot->GetClass()->GetName(),
nroot->IsA("nroot") ? "\b" : "not",
"nroot");
// 2. nroot is a nobject?
n_printf("[%s] is %s [%s] ",
nroot->GetClass()->GetName(),
nroot->IsA(ks->FindClass("nobject")) ? "\b" : "not",
"nobject");
// 3. nobject is a nroot?
n_printf("[%s] is %s [%s] ",
nobject->GetClass()->GetName(),
nobject->IsA("nroot") ? "\b" : "not",
"nroot");
// 4. ntimerserver is a nroot?
n_printf("[%s] is %s [%s] ",
ntimeserver->GetClass()->GetName(),
ntimeserver->IsA("nroot") ? "\b" : "not",
"nroot");
// 5. nroot is instance of nroot?
n_printf("[%s] is %s instance of [%s] ",
nroot->GetClass()->GetName(),
nroot->IsInstanceOf(ks->FindClass("nroot")) ? "\b" : "not",
"nroot");
// 6. nroot is instance of nobject?
n_printf("[%s] is %s instance of [%s] ",
nroot->GetClass()->GetName(),
nroot->IsInstanceOf(ks->FindClass("nobject")) ? "\b" : "not",
"nobject");
// 7. nfileserver2 is a nobject?
n_printf("[%s] is %s [%s] ",
nfileserver2->GetClass()->GetName(),
nfileserver2->IsA("nobject") ? "\b" : "not",
"nobject");
// 8. nfileserver2 is a ntimeserver?
n_printf("[%s] is %s [%s] ",
nfileserver2->GetClass()->GetName(),
nfileserver2->IsA("ntimeserver") ? "\b" : "not",
"ntimeserver");
/// +Nebula2 RTTI Test
///----------------------------------------------------------------------------
/// 销毁KernelServer
n_delete(ks);
getchar();
return 0;
}
/// -Application
///----------------------------------------------------------------------------
