Can I use a static var to "cache" the result? C++
- by flyout
I am using a function that returns a char*, and right now I am getting the compiler warning "returning address of local variable or temporary", so I guess I will have to use a static var for the return, my question is can I make something like if(var already set) return var else do function and return var?
This is my function:
char * GetUID()
{
TCHAR buf[20];
StringCchPrintf(buf, 20*sizeof(char), TEXT("%s"),
someFunction());
return buf;
}
And this is what I want to do:
char * GetUID()
{
static TCHAR buf[20];
if(strlen(buf)!=0) return buf;
StringCchPrintf(buf, 20*sizeof(char), TEXT("%s"),
someFunction());
return buf;
}
Is this a well use of static vars? And should I use ZeroMemory(&buf, 20*sizeof(char))? I removed it because if I use it above the if(strlen...) my TCHAR length is never 0, should I use it below?
