Re: Incorrect compiler warning C4267

From:
"Alex Blekhman" <xfkt@oohay.moc>
Newsgroups:
microsoft.public.vc.stl
Date:
Fri, 9 Feb 2007 12:03:46 +0200
Message-ID:
<#l6$VGDTHHA.5060@TK2MSFTNGP02.phx.gbl>
"Number 774" wrote:

I'm running VS 2005, configured for 32 bit with 64 bit
warnings on. This bit
of code

#include <vector>
#include <list>
std::vector<size_t> vs;
std::list<unsigned int> uiList;
unsigned int ui = uiList.front();

results in a compiler warning at the last line
warning C4267: 'initializing' : conversion from 'size_t'
to 'unsigned int',
possible loss of data
uiList.front()'s data type should be reference to unsigned
int, so it ought
to compile fine.
It does compile fine if either (a) you don't declare the
vector at line 3 or
(b) the type of the list and variable are int, not
unsigned int.

I reckon this is a compiler bug. Can I have people's
thoughts on that - not
least where I formally report it?


There was similar bug in VC++2003.NET related to 64-bit
portability checks. It appears that MS decided not to fix it
in VC++2005. Here's discussion of the issue:

"bug with vector<unsigned int> ?"
http://groups.google.com/group/microsoft.public.vc.stl/browse_frm/thread/2382bd00735f7f67/38b0438cfbc1e900

One of possible solutions is to disable 64-bit portability
checks (/Wp64 switch or "Detect 64-bit Portability Issues"
in Properties -> C++ -> General).

Alex

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