Re: [boost] Failures for GCC 4.4.1 with gnu++0x

Subject: Re: [boost] Failures for GCC 4.4.1 with gnu++0x
From: Eric Niebler (eric_at_[hidden])
Date: 2009-09-05 20:36:04

Christopher Jefferson wrote:
> On 5 Sep 2009, at 13:25, Beman Dawes wrote:
>> I missed iostreams. The problem seems to be a bug in gcc. This program:
>>
>> #include <utility>
>>
>> int main()
>> {
>>  std::pair<int, int*> x(0,0);
>>  return 0;
>> }
>>
>> compiles without -std=gnu++0x, but with -std=gnu++0x gets an error:
>>
>> c:\gcc\bin\../lib/gcc/i386-pc-mingw32/4.4.0/../../../../include/c++/4.4.0/bits/stl_pair.h: 
>>
>> In constr
>> uctor 'std::pair<_T1, _T2>::pair(_U1&&, _U2&&) [with _U1 = int, _U2 =
>> int, _T1 = int, _T2 = int*]':
>> cvt-0-to-ptr.cpp:5:   instantiated from here
>> c:\gcc\bin\../lib/gcc/i386-pc-mingw32/4.4.0/../../../../include/c++/4.4.0/bits/stl_pair.h:90: 
>>
>> error:
>> invalid conversion from 'int' to 'int*'
> 
> This is technically a bug in the C++0x draft standard, but one which I 
> hope will be fixed somehow before it is finalised, as it will break 
> existing valid code, like this.

I agree. This is terrible. Has anyone filed an issue with the C++ 
committee about this? Beman? If not, I will. We now have field 
experience -- this is breaking real code.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com