Implement full support for non-pointer pointers in custom allocators for vector.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185093 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/sequences/vector/iterators.pass.cpp

@@ -20,6 +20,14 @@
 #include <cassert>
 #include <iterator>
 
+#include "../../min_allocator.h"
+
+struct A
+{
+    int first;
+    int second;
+};
+
 int main()
 {
     {
@@ -69,4 +77,62 @@ int main()
         C::iterator i;
         C::const_iterator j;
     }
+#if __cplusplus >= 201103L
+    {
+        typedef int T;
+        typedef std::vector<T, min_allocator<T>> C;
+        C c;
+        C::iterator i = c.begin();
+        C::iterator j = c.end();
+        assert(std::distance(i, j) == 0);
+        assert(i == j);
+    }
+    {
+        typedef int T;
+        typedef std::vector<T, min_allocator<T>> C;
+        const C c;
+        C::const_iterator i = c.begin();
+        C::const_iterator j = c.end();
+        assert(std::distance(i, j) == 0);
+        assert(i == j);
+    }
+    {
+        typedef int T;
+        typedef std::vector<T, min_allocator<T>> C;
+        C c;
+        C::const_iterator i = c.cbegin();
+        C::const_iterator j = c.cend();
+        assert(std::distance(i, j) == 0);
+        assert(i == j);
+        assert(i == c.end());
+    }
+    {
+        typedef int T;
+        typedef std::vector<T, min_allocator<T>> C;
+        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+        C c(std::begin(t), std::end(t));
+        C::iterator i = c.begin();
+        assert(*i == 0);
+        ++i;
+        assert(*i == 1);
+        *i = 10;
+        assert(*i == 10);
+        assert(std::distance(c.begin(), c.end()) == 10);
+    }
+    {
+        typedef int T;
+        typedef std::vector<T, min_allocator<T>> C;
+        C::iterator i;
+        C::const_iterator j;
+    }
+    {
+        typedef A T;
+        typedef std::vector<T, min_allocator<T>> C;
+        C c = {A{1, 2}};
+        C::iterator i = c.begin();
+        i->first = 3;
+        C::const_iterator j = i;
+        assert(j->first == 3);
+    }
+#endif
 }