Error message "name lookup of 't' changed for ISO 'for' scoping"??

[ausairman]

Here is the code that causes it:

for (int t = _T_START; t != _T_END; t++) { // error
  cout <<t;
}

where _T_START and _T_END are #defined. removing these and using numbers seems to fix the problem:

for (int t = 0; t != 10; t++) { //works fine
  cout <<t;
}

also declaring t outside the loop doesn't help:

int t;
for (t = _T_START; t != _T_END; t++) { //fail
  cout <<t;
}

I'd really appreciate if someone could tell me what on earth is going on here, thanks!

[Peter87]

Where did you find these macros and why do you use them?

[ausairman]

What do you mean by macro? I defined the _T_START and _T_END values myself. Interestingly, the following does work:

	
int t = _T_START;
for (; t != _T_END; t++) { // works!
  cout <<t;
}

So the problem doesn't seem to be the #defined values, but rather something about scoping that the compiler doesn't like, I just don't see what it could be...

[ausairman]

ah crud my bad; I had semicolons after my #define statements for those values:

#define _T_START 1; //bad!
#define _T_END 20; //bad! 

[Peter87]

This is one of the reasons why you should prefer const for constants.