refs #311 added initializer_list constructors in containers

src/blackmisc/range.h

@@ -15,9 +15,20 @@
 #include <algorithm>
 #include <type_traits>
 #include <iterator>
+#include <initializer_list>
 
 namespace BlackMisc
 {
+    namespace Private
+    {
+        // Trait to exclude std::initializer_list from the overload set of CRange conversion operators using SFINAE.
+        // Needed to workaround a bug in MSVC whereby it considers the copy constructor and initializer list constructor
+        // of a container to be ambiguous when converting from a CRange.
+        //! \private
+        template <class T> struct is_initializer_list : public std::false_type {};
+        //! \private
+        template <class T> struct is_initializer_list<std::initializer_list<T>> : public std::true_type {};
+    }
 
     template <class> class CRange;
 
@@ -135,7 +146,8 @@ namespace BlackMisc
         //! @}
 
         //! Implicit conversion to any container of value_type which supports push_back. This will copy elements.
-        template <class T, class = typename std::enable_if<std::is_convertible<value_type, typename T::value_type>::value>::type>
+        template <class T, class = typename std::enable_if<! Private::is_initializer_list<T>::value &&
+                                                           std::is_convertible<value_type, typename T::value_type>::value>::type>
         operator T() const
         {
             T container;