[boost] [fusion] Tuples partly broken in cvs HEAD?

From: John Maddock (john_at_[hidden])
Date: 2006-10-24 12:10:49

Some of my code that uses the TR1/Tuples code has stopped working.  Sorry 
don't know when, haven't built this particular program in a while.  The test 
case is:

#include <boost/tr1/tuple.hpp>

std::tr1::tuple<double, double, double, double, double, double, double>
 foo(int i)
{
   return std::tr1::make_tuple(i, i+1, i+2, i+3, i+4, i+5, i+6);
}

int main()
{
   foo(2);
}

Which generates the errors:

$ cl -EHsc -I. -c scrap.cpp
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 
80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

scrap.cpp
scrap.cpp(6) : error C2664: 
'boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6>::tuple(const 
boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6> &)' : cannot convert parameter 1
 from 'boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9>' to 'const 
boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6> &'
        with
        [
            T0=double,
            T1=double,
            T2=double,
            T3=double,
            T4=double,
            T5=double,
            T6=double
        ]
        and
        [
            T0=int,
            T1=int,
            T2=int,
            T3=int,
            T4=int,
            T5=int,
            T6=int,
            T7=boost::fusion::void_,
            T8=boost::fusion::void_,
            T9=boost::fusion::void_
        ]
        and
        [
            T0=double,
            T1=double,
            T2=double,
            T3=double,
            T4=double,
            T5=double,
            T6=double
        ]
        Reason: cannot convert from 
'boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9>' to 'const 
boost::fusion::tuple<T0,T1,T2,T3,T4,T5,T6>'
        with
        [
            T0=int,
            T1=int,
            T2=int,
            T3=int,
            T4=int,
            T5=int,
            T6=int,
            T7=boost::fusion::void_,
            T8=boost::fusion::void_,
            T9=boost::fusion::void_
        ]
        and
        [
            T0=double,
            T1=double,
            T2=double,
            T3=double,
            T4=double,
            T5=double,
            T6=double
        ]
        No user-defined-conversion operator available that can perform this 
conversion, or the operator cannot be called

Looks like the definition of make_tuple is out of synch with tuple?

It works OK with the release branch BTW.

Thanks,  John.