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