Creating multiple timers with ITimer class

[kushagra]

The class is abstract
How can i create a number of virtual timers
like
class b
{
class a
{
----> ITimer timer;

}o2[30];
}
object;

object.o2[0].timer.setTime(0);
object.o2[0].timer.start();
..
.
.
.
and so on

Now the error is shown and the line (---->) shown above that ITimer is an abstract class

error:
cannot instantiate abstract class

[hybrid]

Use CTImer. All classes prefixed by 'I' are interfaces, and thus abstract. You have to use an implementation of this interface, or provide one on your own to create objects.

[kushagra]

I included ctimer.h

and created object CTimer timer;
then timer.setTime(0);
then timer.start(0);


errors

main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::initTimer(void)" (?initTimer@Timer@os@irr@@SAXXZ) referenced in function "public: __thiscall irr::CTimer::CTimer(void)" (??0CTimer@irr@@QAE@XZ)
main.obj : error LNK2019: unresolved external symbol "public: static unsigned int __cdecl irr::os::Timer::getRealTime(void)" (?getRealTime@Timer@os@irr@@SAIXZ) referenced in function "public: virtual unsigned int __thiscall irr::CTimer::getRealTime(void)" (?getRealTime@CTimer@irr@@UAEIXZ)
main.obj : error LNK2019: unresolved external symbol "public: static unsigned int __cdecl irr::os::Timer::getTime(void)" (?getTime@Timer@os@irr@@SAIXZ) referenced in function "public: virtual unsigned int __thiscall irr::CTimer::getTime(void)" (?getTime@CTimer@irr@@UAEIXZ)
main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::setTime(unsigned int)" (?setTime@Timer@os@irr@@SAXI@Z) referenced in function "public: virtual void __thiscall irr::CTimer::setTime(unsigned int)" (?setTime@CTimer@irr@@UAEXI@Z)
main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::stopTimer(void)" (?stopTimer@Timer@os@irr@@SAXXZ) referenced in function "public: virtual void __thiscall irr::CTimer::stop(void)" (?stop@CTimer@irr@@UAEXXZ)
main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::startTimer(void)" (?startTimer@Timer@os@irr@@SAXXZ) referenced in function "public: virtual void __thiscall irr::CTimer::start(void)" (?start@CTimer@irr@@UAEXXZ)
main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::setSpeed(float)" (?setSpeed@Timer@os@irr@@SAXM@Z) referenced in function "public: virtual void __thiscall irr::CTimer::setSpeed(float)" (?setSpeed@CTimer@irr@@UAEXM@Z)
main.obj : error LNK2019: unresolved external symbol "public: static float __cdecl irr::os::Timer::getSpeed(void)" (?getSpeed@Timer@os@irr@@SAMXZ) referenced in function "public: virtual float __thiscall irr::CTimer::getSpeed(void)" (?getSpeed@CTimer@irr@@UAEMXZ)
main.obj : error LNK2019: unresolved external symbol "public: static bool __cdecl irr::os::Timer::isStopped(void)" (?isStopped@Timer@os@irr@@SA_NXZ) referenced in function "public: virtual bool __thiscall irr::CTimer::isStopped(void)" (?isStopped@CTimer@irr@@UAE_NXZ)
main.obj : error LNK2019: unresolved external symbol "public: static void __cdecl irr::os::Timer::tick(void)" (?tick@Timer@os@irr@@SAXXZ) referenced in function "public: virtual void __thiscall irr::CTimer::tick(void)" (?tick@CTimer@irr@@UAEXXZ)
..\..\bin\Win32-VisualStudio\TerrainRendering.exe : fatal error LNK1120: 10 unresolved externals

[Guest]

1. ITimer* timer;
2. timer->setTime(0);
3. timer->start();

why the application crashes at point 2 and 3;
when i comment point 2 and 3 application works fine

works fine when commented
1. ITimer* timer;
2. //timer->setTime(0);
3. //timer->start();

what is the prob in creating a timer like this and in point 2 and 3