我有一個情況(在嵌入式系統上),我想從另一個任務調用函數。我發現這種方法是這樣做的http://www.drdobbs.com/elegant-function-call-wrappers/184401385。但我該怎麼做更多的爭論。最好的情況我有一個解決方案,這是在模板中,但我不知道如何實現這一點。無論如何,也可以創建如下所示的兩個太陽穴(在一個小型的Visual Studio C++測試中)。除了給出編譯時錯誤的DeferCall2調用之外,一切正常。我在這裏犯了什麼錯誤?C++模板問題與其他參數
#include "stdafx.h"
#include "stdlib.h"
#include "stdio.h"
class Functor
{
public:
virtual ~Functor() {}
virtual void operator()() = 0;
};
template< class CalleePtr, class MemFunPtr, class Parm1 >
class MemberFunctor1 : public Functor
{
public:
MemberFunctor1
(
const CalleePtr & pCallee,
const MemFunPtr & pFunction,
Parm1 aParm1
) :
pCallee(pCallee),
pFunction(pFunction),
aParm1(aParm1)
{
}
virtual void operator()()
{
if ((pCallee != NULL) &&
(pFunction != NULL))
{
((*pCallee).*pFunction)(aParm1);
}
}
private:
CalleePtr pCallee;
MemFunPtr pFunction;
Parm1 aParm1;
};
template< class CalleePtr, class MemFunPtr, class Parm1, class Parm2 >
class MemberFunctor2 : public Functor
{
public:
MemberFunctor2
(
const CalleePtr & pCallee,
const MemFunPtr & pFunction,
Parm1 aParm1,
Parm2 aParm2
) :
pCallee(pCallee),
pFunction(pFunction),
aParm1(aParm1),
aParm2(aParm2)
{
}
virtual void operator()()
{
if ((pCallee != NULL) &&
(pFunction != NULL))
{
((*pCallee).*pFunction)(aParm1, aParm2);
}
}
private:
CalleePtr pCallee;
MemFunPtr pFunction;
Parm1 aParm1;
Parm2 aParm2;
};
template< class CalleePtr, class Callee, class Ret, class Type1, class Parm1 >
inline Functor * DeferCall
(
const CalleePtr & pCallee,
Ret(Callee::*pFunction)(Type1),
const Parm1 & rParm1
)
{
return new
MemberFunctor1< CalleePtr,
Ret(Callee::*)(Type1), Parm1 >
(pCallee, pFunction, rParm1);
}
template< class CalleePtr, class Callee, class Ret, class Type1, class Parm1, class Parm2>
Functor * DeferCall2
(
const CalleePtr & pCallee,
Ret(Callee::*pFunction)(Type1),
const Parm1 & rParm1,
const Parm2 & rParm2
)
{
return new
MemberFunctor2< CalleePtr,
Ret(Callee::*)(Type1), Parm1, Parm2 >
(pCallee, pFunction, rParm1, rParm2);
}
class TestObj
{
public:
void test1 (int a)
{
printf("test 1 a=%d\r\n", a);
}
void test2 (int a, int b)
{
printf("test 2 a=%d, b=%d\r\n", a, b);
}
void test (void)
{
Functor * pCall = DeferCall(this, &TestObj::test1, 3);
Functor * pCall1 = new MemberFunctor1 < TestObj *, void (TestObj::*)(int), int >(this, &TestObj::test1, 6);
Functor * pCall2 = new MemberFunctor2 < TestObj *, void (TestObj::*)(int, int), int, int >(this, &TestObj::test2, 4, 5);
Functor * pCall3 = DeferCall2(this, &TestObj::test2, 3, 3); // Compile time error.
if (pCall)
(*pCall)();
if (pCall1)
(*pCall1)();
if (pCall2)
(*pCall2)();
if (pCall3)
(*pCall3)();
delete pCall;
delete pCall1;
delete pCall2;
delete pCall3;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
TestObj *obj = new TestObj();
obj->test();
delete obj;
return 0;
}