[Bug c++/59328] New: Template cast operator ambiguity in a delete expression

[maxime.van.noppen at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59328

            Bug ID: 59328
           Summary: Template cast operator ambiguity in a delete
                    expression
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: maxime.van.noppen at gmail dot com

The following code fails to compile with gcc whereas it works on Clang, Visual
Studio and ICC.

The version of gcc I tested: 4.4.7, 4.5.3, 4.6.4, 4.7.3, 4.8.1, 4.9.0 20130909

Code snippet:

template<typename T>
struct Ptr
{
  template<typename U>
  operator U*() const;

  operator const T*() const;
};

void foo()
{
  Ptr<int> ptr;
  delete ptr;
}

Errors:

error: default type conversion can't deduce template argument for
‘template<class U> Ptr<T>::operator U*() const [with U = U; T = int]’
error: type ‘struct Ptr<int>’ argument given to ‘delete’, expected pointer

My understanding is that the compiler shouldn't consider the templated cast
operator and that there shouldn't be an ambiguity here. This is what the other
compilers mentioned above do.

This is somewhat similar to the bug 58119 and I can confirm that the bug was
fixed on 4.9.0 20130909 but this code still fails on that version.