Re: Old for scope rules (/forScope-) don't work with STL declarations?

"Tom Widmer [VC++ MVP]" <>
Thu, 30 Nov 2006 10:38:42 +0000
Nimai wrote:

In trying to get hundreds of legacy C++ projects compiling under VS
2005 from 2003, I turned off the proper for-loop scoping rules using

It works fine with for loops declaring ints, but I got an undeclared
identifier error when referencing a for-declared STL iterator. I tried
std::string too, out of curiosity, and it doesn't behave properly
Here's a meaningless example meant to demonstrate the problem only:

for( int xx=0; xx<10; ++xx)
result = (xx==10); // WORKS FINE
for( std::string yy; !yy.empty(); yy.clear())
yy.clear(); //IN VS2005: error C2065: 'yy' : undeclared identifier'

Any idea what might be going on here? Why would STL classes be any
different than built-in types? (I tried declaring my own struct in the
for loop, and it worked as int did.)

The problem seems to apply to all types that have destructors - they get
destroyed at the end of the for loop rather than the end of the
enclosing scope. It seems a surprisingly serious bug to have got through
- there appears to be a regression test missing from MS's suite!


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