No matching function call

[Jscott]

Greetings,

I am hoping to recieve feedback on the following error:

no matching function for call to `CCtm::SetVect (int, void ()())'
candidates are: CCtm::SetVect(BYTE, void *)


I have the function SetVect() declared and i am sending the required variables.

Here is a code snip:

CCtm::CCtm()
{
    if(!c_iInitOk)
    {
        SetupBIUM(c_wTmcrInit);
       
        SetVect (CTM_IRQ_MCSM2,  IrqCtmMCSM2);
        SetVect (CTM_IRQ_DASM3,  IrqCtmDASM3);




    }
}


//--------------------- CCtm::SetVect-------------------------
void CCtm::SetVect(BYTE channel,void *startAdr)
{
    long *pointer;
    pointer  = (long *)(IRQ_VECTOR_TAB_PTR + c_byBaseVect + channel);
    *pointer = (long) startAdr;
}

Thanks for your time.

[laserlight]

Take a close look at the actual arguments of the function calls and compare them to the types of the formal parameters of the function definition. Do they match? Recall that function pointers are not convertible to void*.

[Elysia]

Beware that casting a function pointer's address (or even ANY pointer for that matter) to long may cause truncation. If it can be helped, ensure you are assigning to the same type (e.g. void*) instead of long.

[Jscott]

Hey laserlight,

The parameters are as follows:

#define CTM_IRQ_MCSM2 1
#define CTM_IRQ_DASM3 2

IrqCtmMCSM2 and IrqCtmDASM3 are actually meant to be interrupt functions.

friend __attribute__((interrupt)) void IrqCtmMCSM2(void);
friend __attribute__((interrupt)) void IrqCtmDASM3(void);

[Jscott]

I do believe it is right. I might have messed it up with the attribute cast.

[laserlight]

I repeat: function pointers are not convertible to void*.

Look carefully at the error message:

no matching function for call to `CCtm::SetVect (int, void ()())'
candidates are: CCtm::SetVect(BYTE, void *)

You can see that void()() and void* do not match. int and BYTE probably do match.

[phantomotap]

I repeat: function pointers are not convertible to void*.

O_o

I know what you are saying, but I wanted to add that the reality is actually more problematic.

You can force the conversion of a pointer to a function to a `void *`, but the conversion may result in a loss of the actual value.

In other words, you can force a pointer to a function to a `void *`; you may not get the pointer to a function back when you try to reverse the process.

Soma

[Jscott]

I have tried researching on possible solutions to change a void * to void()().

I am just wondering how/why it would be possible in a microtec compiler vs the GNU compiler.

[phantomotap]

I am just wondering how/why it would be possible in a microtec compiler vs the GNU compiler.

O_o

Much like the pirate's code, the standard is more what you'd call guidelines.

Some compiler vendors will add extensions, and some programmers will use extensions.

Soma

[Jscott]

Hey guys,

Just wanted to say thanks for your time and help.

Here is the solution that seemed to work (if you were curious):

void CCtm::SetVect(BYTE channel, void (*startAdr)(void))

-J