Made the std_vector_c able to copy directly from std::vector objects.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402902

dlib/stl_checked/std_vector_c.h

@@ -48,7 +48,7 @@ namespace dlib
                      const Allocator& alloc= Allocator()) : impl(first,last,alloc) {}
 
         std_vector_c(const std_vector_c<T,Allocator>& x) : impl(x.impl) {}
-
+        std_vector_c(const std::vector<T,Allocator>& x) : impl(x) {}
 
         std_vector_c<T,Allocator>& operator=(const std_vector_c<T,Allocator>& x)
         {
@@ -56,6 +56,12 @@ namespace dlib
             return *this;
         }
 
+        std_vector_c<T,Allocator>& operator=(const std::vector<T,Allocator>& x)
+        {
+            impl = x;
+            return *this;
+        }
+
         template <typename InputIterator>
         void assign(InputIterator first, InputIterator last)    { impl.assign(first,last); }
         void assign(size_type n, const T& u)                    { impl.assign(n,u); }

dlib/stl_checked/std_vector_c_abstract.h

@@ -83,6 +83,13 @@ namespace dlib
                 - #*this == x
         !*/
 
+        std_vector_c(
+            const std::vector<T,Allocator>& x
+        );
+        /*!
+            ensures
+                - #*this == x
+        !*/
 
         std_vector_c<T,Allocator>& operator= (
             const std_vector_c<T,Allocator>& x
@@ -93,6 +100,15 @@ namespace dlib
                 - returns #*this
         !*/
 
+        std_vector_c<T,Allocator>& operator= (
+            const std::vector<T,Allocator>& x
+        );
+        /*!
+            ensures
+                - #*this == x
+                - returns #*this
+        !*/
+
         template <typename InputIterator>
         void assign(
             InputIterator first,