Add some examples of how to create type_indexes

examples/my_type_index.cpp_

@@ -0,0 +1,51 @@
+// Copyright 2013-2014 Antony Polukhin
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+//[type_index_my_type_index_sources
+/*`
+    The following example shows how to create an own type_info clas and how
+    to use it all around the project.
+*/
+
+#define BOOST_TYPE_INDEX_USER_TYPEINFO \
+    "../../../libs/type_index/examples/my_type_index.hpp"
+#define BOOST_TYPE_INDEX_USER_TYPEINFO_NAME my_namespace::my_type_info
+#include <boost/type_index.hpp>
+#include <cassert>
+
+class Base {
+public:
+    virtual my_type_index type_info() const BOOST_NOEXCEPT {
+        return boost::typeind::type_info<Base>(); 
+    }
+    virtual ~Base(){}
+};
+
+class Derived: public Base {
+public:
+    virtual my_type_index type_info() const BOOST_NOEXCEPT {
+        return boost::typeind::type_id<Derived>(); 
+    }
+};
+
+
+using boost::typeind;
+
+int main() {
+    Base base;
+    Derived derived;
+
+    Base& derived_as_base; 
+
+    assert(type_id_runtime(derived) == type_id_runtime(derived_as_base));
+    assert(type_id_runtime(base) != type_id_runtime(derived_as_base));
+    assert(type_id_runtime(base) != type_id_runtime(derived));
+    assert(type_id_runtime(derived_as_base).pretty_name() == "Derived");
+}
+
+//] [/type_index_registry_example]
+
+//] [/type_index_my_type_index_sources]

examples/my_type_index.hpp

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+// Copyright 2013-2014 Antony Polukhin
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+//[type_index_my_type_index
+/*`
+    The following example shows how to create an own type_info clas and how
+    to use it all around the project.
+*/
+
+#ifndef MY_NAMESPACE_MY_TYPE_INDEX_HPP
+#define MY_NAMESPACE_MY_TYPE_INDEX_HPP
+
+// We'll use ctti_type_info as a base class for my_type_info
+#include <boost/type_index/ctti_type_info.hpp>
+namespace my_namespace {
+
+struct my_type_index: public ctti_type_info {
+    my_type_index(const ctti_type_info::type_info_t& data) BOOST_NOEXCEPT 
+        : ctti_type_info(data)
+    {}
+
+    template <class T>
+    static inline my_type_info construct_runtime(const T& value) BOOST_NOEXCEPT {
+        return value.type_info();
+    }
+};
+
+} // namespace my_namespace
+
+#endif // MY_NAMESPACE_MY_TYPE_INDEX_HPP
+//] [/type_index_my_type_index]
+