AMDG

Siegfried Kettlitz wrote:

Thanks, that is just what i was looking for. :)

Apparently that's the key point for detecting the implicit conversion
constructor:
template< typename From >
struct does_conversion_exist
{
  template< typename To > struct result_
  {
      static no_type BOOST_TT_DECL _m_check(...);
      static yes_type BOOST_TT_DECL _m_check(To);
      static From _m_from;
      enum { value = sizeof( _m_check(_m_from) ) == sizeof(yes_type) };
  };
};


Can this be extended to constructors with more than one parameter?
 

There is no known way to detect constructors except for
the special case of implicit conversions.