GCC6: implicit casting triggers error

[Sandro Mani <manisandro@xxxxxxxxx>]

Hi

Med builds are failing with

medfile_int_wrap.cc:11272:30: error: no matching function for call to 'std::vector<double, std::allocator<double> >::erase(SwigValueWrapper<__gnu_cxx::__normal_iterator<double*, std::vector<double, std::allocator<double> > > >&)'
   result = (arg1)->erase(arg2);


A standalone version which fails to compile (ignoring the fact that arg2 is not initialized):

---------------------

#include <vector>

typedef double         med_float;

template<typename T> class SwigValueWrapper {
  struct SwigMovePointer {
    T *ptr;
    SwigMovePointer(T *p) : ptr(p) { }
    ~SwigMovePointer() { delete ptr; }
    SwigMovePointer& operator=(SwigMovePointer& rhs) { T* oldptr = ptr; ptr = 0; delete oldptr; ptr = rhs.ptr; rhs.ptr = 0; return *this; }
  } pointer;
  SwigValueWrapper& operator=(const SwigValueWrapper<T>& rhs);
  SwigValueWrapper(const SwigValueWrapper<T>& rhs);
public:
  SwigValueWrapper() : pointer(0) { }
  SwigValueWrapper& operator=(const T& t) { SwigMovePointer tmp(new T(t)); pointer = tmp; return *this; }
  operator T&() const { return *pointer.ptr; }
  T *operator&() { return pointer.ptr; }
};

template <typename T> T SwigValueInit() {
  return T();
}

int main() {
  std::vector< med_float > arg1;
  SwigValueWrapper< std::vector< double >::iterator > arg2;
  arg1.erase(arg2);
};

---------------------

GCC 5 compiles the code. GCC6 seems to require an explicit cast, even though

std::vector<double>::iterator it = arg2;


works. GCC bug?

Thanks
asndro

--
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxxx
http://lists.fedoraproject.org/admin/lists/devel@xxxxxxxxxxxxxxxxxxxxxxx