Hi,
there are compile problems with std::auto_ptr.
The following code won't compile:
<code>
#include <memory>
#include <sigc++/functors/ptr_fun.h>
void test(std::auto_ptr<int>)
{
}
int main()
{
std::auto_ptr<int> p;
sigc::ptr_fun(&test)(p);
return 0;
}
</code>
If function arguments are passed by value then sigc internally creates a
const std::auto_ptr& with the type_trait<std::auto_ptr>::take, but
std::auto_ptr has a copy constructor that takes a nonconst argument:
auto_ptr& operator =(auto_ptr& nonconst);
A way to resolve this problem is to define a specialization of the type
traits for std::auto_ptr:
namespace sigc
{
template<typename T>
struct type_trait<std::auto_ptr<T> >
{
typedef std::auto_ptr<T> type;
// doesn't work with g++
//typedef std::auto_ptr_ref<T> pass;
//typedef std::auto_ptr_ref<T> take;
typedef std::auto_ptr<T>& pass;
typedef std::auto_ptr<T>& take;
typedef std::auto_ptr<T>* pointer;
};
} // namespace sigc
Could this specialization be taken into sigc++?
What do you think?
--
Klaus Triendl
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