Work around visual studio's lack of C++11 support.

dlib/global_optimization/find_global_maximum.h

@@ -38,7 +38,9 @@ namespace dlib
             return f(a(indices-1)...); 
         }
 
-
+        // Visual studio, as of November 2017, doesn't support C++11 and can't compile this code.  
+        // So we write the terrible garbage in the #else for visual studio.  When Visual Studio supports C++11 I'll update this #ifdef to use the C++11 code.
+#ifndef _MSC_VER 
         template <size_t max_unpack>
         struct call_with_vect
         {
@@ -64,6 +66,20 @@ namespace dlib
                 return f(disable_decay_to_scalar(a));
             }
         };
+#else
+        template <size_t max_unpack>
+        struct call_with_vect
+        {         
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), disable_decay_to_scalar(a))  {return f(disable_decay_to_scalar(a));   }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0)) { DLIB_CASSERT(a.size() == 1); return f(a(0)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0),a(1)) { DLIB_CASSERT(a.size() == 2); return f(a(0),a(1)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0), a(1), a(2)) { DLIB_CASSERT(a.size() == 3); return f(a(0), a(1),a(2)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0), a(1), a(2), a(3)) { DLIB_CASSERT(a.size() == 4); return f(a(0), a(1), a(2), a(3)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0), a(1), a(2), a(3), a(4)) { DLIB_CASSERT(a.size() == 5); return f(a(0), a(1), a(2), a(3), a(4)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0), a(1), a(2), a(3), a(4), a(5)) { DLIB_CASSERT(a.size() == 6); return f(a(0), a(1), a(2), a(3), a(4), a(5)); }
+template <typename T> static auto go(T&& f, const matrix<double, 0, 1>& a) -> decltype(std::forward<T>(f), a(0), a(1), a(2), a(3), a(4), a(5), a(6)) { DLIB_CASSERT(a.size() == 7); return f(a(0), a(1), a(2), a(3), a(4), a(5), a(6)); }
+        };
+#endif
     }
 
 // ----------------------------------------------------------------------------------------