diff options
Diffstat (limited to 'xml/serializer.ixx')
| -rw-r--r-- | xml/serializer.ixx | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/xml/serializer.ixx b/xml/serializer.ixx index 465fede..59d329f 100644 --- a/xml/serializer.ixx +++ b/xml/serializer.ixx @@ -155,26 +155,27 @@ namespace xml namespace details { - // Detect whether T defines void operator(A) const. + // Detect whether T is callable with argument A. // template <typename T, typename A> - struct is_functor + struct is_callable { typedef char no[1]; typedef char yes[2]; + template <typename X> static X declval (); - template <typename X, X> struct check; + template <int> struct check; template <typename> static no& test (...); template <typename X> - static yes& test (check<void (X::*) (A) const, &X::operator ()>*); + static yes& test (check<sizeof (declval<X> () (declval<A> ()), 0)>*); static const bool value = sizeof (test<T> (0)) == sizeof (yes); }; - template <typename T, bool = is_functor<T, serializer&>::value> + template <typename T, bool = is_callable<const T&, serializer&>::value> struct inserter; template <typename T> |