Pointer to class member function

[Mila025]

Hi, Maybe today isn't my best day ;) but could anyone tell me what is wrong with this snippet ?

class CTest
{
public:
CTest()
{
(*(this)).lpFunc = &CTest::Write;
}
long Write(DWORD dwInfo)
{
...
}
long (*lpFunc)(DWORD);
}

I've got error C2440:

'=' : cannot convert from 'long (__thiscall CTest::* )(DWORD)' to 'long (__cdecl *)(DWORD)'

and when I change line: (*(this)).lpFunc = &CTest::Write; to

(CTest::*lpFunc) = &CTest::Write;

I've got another error code:

error C2059: syntax error : '<tag>::*'

Generally I want to point on lpFunc a pointer to Write fuction but within class (I don't want to any globals). ----------- Mila -- modified at 3:15 Wednesday 28th June, 2006

[toxcct]

Mila025 wrote:

'=' : cannot convert from 'long (__thiscall CTest::* )(DWORD)' to 'long (__cdecl *)(DWORD)'

notice the calling convention of the two parts of your operator = reported by the compiler. you function Write has to be either static or global. the fact is that being a class member function implicitely adds it the this pointer parameter...

---

TOXCCT >>> GEII power

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[Don Box]

That Write method MUST be static. So solution is :- class CTest { public: CTest() { (*(this)).lpFunc = &CTest::Write; } static long Write(DWORD dwInfo) { ... } long (*lpFunc)(DWORD); }

[Justin Tay]

That's not how you declare a member function pointer.

class CTest
{
public:
CTest()
{
lpFunc = &CTest::Write;
}
long Write(DWORD dwInfo)
{
...
}
long (CTest::*lpFunc)(DWORD); // declaration for member function pointer
};

[talkshit1]

static need be there ONLY if it is not a member of the class.

[super_ttd]

certainly not !!! compile the code and tell if the compiler complains... :suss: -- TTD --