[RESOLVED]return(*var=0,NULL);

I am trying to compile code on MinGW for Mac and now I notice the code has a construct I've never seen, which compiled on VC++ 6.0 and VC++ Express.

SomeStruct* CMyClass::MyMethod(const char *symbol,const int period,const time_t lasttime,int *count)

{

if(Something==NULL) return(*count=0,NULL);

return Something(m_somevar,symbol,period,lasttime,count);

}

count is not a member of SomeStruct, so I assume it is just setting the value count points to equal to 0, then returning NULL.

So does this do the same thing:

if(Something==NULL) {
*count=0;
return(NULL);
}
return Something(m_somevar,symbol,period,lasttime,count);

Or is there a switch I can pass to MinGW to let it accept the original return construct?

I believe you are correct.

In C++, the comma operator evaluates each expression from left to right, and the value of the expression is the last operand.

For example,

Code:

---

int a, b;
b = (a = 3, a++, a + 7)

---

assigns b the value of 11.

I'm not sure why the code would be written that way, except to keep it all on a single line. It would be better to write it as you did:

Code:

---

if (somthing == NULL)
{
    *count = 0;
    return NULL;
}

---

Thanks.