[Boost-users] lambda code fails to compile on g++ 4.3.1

Subject: [Boost-users] lambda code fails to compile on g++ 4.3.1
From: Tim Hockin (thockin_at_[hidden])
Date: 2008-12-15 22:25:03

This code builds and runs under g++ 4.2.2.  It fails under 4.3.1.  Help?

Tim

#include <boost/lambda/lambda.hpp>

using boost::lambda::_1;

template<typename Tcallback>
void function(Tcallback callback)
{
       (void)callback;
}

int main()
{
       function(_1); // works
       function(_1+0); // fails
       return 0;
}

$ /usr/crosstool/v12/gcc-4.3.1-glibc-2.3.6-grte//i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-g++
-W -Wall -o broken broken.cc -I/usr/include
/usr/include/boost/lambda/detail/lambda_functors.hpp: In instantiation
of 'boost::lambda::lambda_functor<boost::lambda::identity<const int>
>':
/usr/include/boost/lambda/detail/lambda_functor_base.hpp:164:
instantiated from
'boost::lambda::detail::deduce_argument_types_<boost::tuples::cons<const
int, boost::tuples::null_type>, boost::tuples::null_type>'
/usr/include/boost/lambda/detail/lambda_functor_base.hpp:170:
instantiated from
'boost::lambda::detail::deduce_argument_types_<boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>
>, const int, boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type>,
boost::tuples::null_type>'
/usr/include/boost/lambda/detail/lambda_functor_base.hpp:213:
instantiated from
'boost::lambda::detail::deduce_argument_types<boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>
>, const int, boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type>,
boost::tuples::null_type>'
/usr/include/boost/lambda/detail/operator_lambda_func_base.hpp:60:
instantiated from
'boost::lambda::detail::binary_rt<boost::lambda::arithmetic_action<boost::lambda::plus_action>,
boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>
>, const int, boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type>,
boost::tuples::null_type>'
/usr/include/boost/lambda/detail/operator_lambda_func_base.hpp:206:
instantiated from
'boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>,
boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>
>, const int, boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type>
>::sig<boost::tuples::null_type>'
/usr/include/boost/lambda/detail/lambda_functors.hpp:135:
instantiated from
'boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::plus_action>,
boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>
>, const int, boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type,
boost::tuples::null_type, boost::tuples::null_type> > >'
broken.cc:14:   instantiated from here
/usr/include/boost/lambda/detail/lambda_functors.hpp:137: warning:
type qualifiers ignored on function return type