dsl_arithmetic_5_accessors.h

template <typename T>
int const* get_as_cst(expression_r<T> const& e)
{
   return boost::get<int>(&e);
}

template <typename T>
id const* get_as_var(expression_r<T> const& e)
{
   return boost::get<id>(&e);
}

template <typename T>
add_op<T> const* get_as_add(expression_r<T> const& e)
{
   return boost::get<add_op<T>>(&e);
}

template <typename T>
mul_op<T> const* get_as_mul(expression_r<T> const& e)
{
   return boost::get<mul_op<T>>(&e);
}