added base() function to the interface of the specialized adaptors

[SVN r21619]

doc/indirect_iterator_eg.rst

@@ -0,0 +1,54 @@
+Example
+.......
+
+
+::
+
+    char characters[] = "abcdefg";
+    const int N = sizeof(characters)/sizeof(char) - 1; // -1 since characters has a null char
+    char* pointers_to_chars[N];                        // at the end.
+    for (int i = 0; i < N; ++i)
+      pointers_to_chars[i] = &characters[i];
+
+    // Example of using indirect_iterator
+
+    boost::indirect_iterator<char**, char>
+      indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N);
+
+    std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ","));
+    std::cout << std::endl;
+
+
+    // Example of making mutable and constant indirect iterators
+
+    char mutable_characters[N];
+    char* pointers_to_mutable_chars[N];
+    for (int j = 0; j < N; ++j)
+      pointers_to_mutable_chars[j] = &mutable_characters[j];
+
+    boost::indirect_iterator<char* const*> mutable_indirect_first(pointers_to_mutable_chars),
+      mutable_indirect_last(pointers_to_mutable_chars + N);
+    boost::indirect_iterator<char* const*, char const> const_indirect_first(pointers_to_chars),
+      const_indirect_last(pointers_to_chars + N);
+
+    std::transform(const_indirect_first, const_indirect_last,
+		   mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
+
+    std::copy(mutable_indirect_first, mutable_indirect_last,
+	      std::ostream_iterator<char>(std::cout, ","));
+    std::cout << std::endl;
+
+
+    // Example of using make_indirect_iterator()
+
+    std::copy(boost::make_indirect_iterator(pointers_to_chars), 
+	      boost::make_indirect_iterator(pointers_to_chars + N),
+	      std::ostream_iterator<char>(std::cout, ","));
+    std::cout << std::endl;
+
+
+The output is::
+
+    a,b,c,d,e,f,g,
+    b,c,d,e,f,g,h,
+    a,b,c,d,e,f,g,