[Boost-commit] svn:boost r48790 - sandbox/libs/extension/examples/value

Subject: [Boost-commit] svn:boost r48790 - sandbox/libs/extension/examples/value
From: oryol_at_[hidden]
Date: 2008-09-15 15:26:08

Author: jeremypack
Date: 2008-09-15 15:26:07 EDT (Mon, 15 Sep 2008)
New Revision: 48790
URL: http://svn.boost.org/trac/boost/changeset/48790

Log:
Examples of writing Adapters for factories of objects that don't use inheritance.

Added:
   sandbox/libs/extension/examples/value/
   sandbox/libs/extension/examples/value/Jamfile.v2   (contents, props changed)
   sandbox/libs/extension/examples/value/shared.hpp   (contents, props changed)
   sandbox/libs/extension/examples/value/value.cpp   (contents, props changed)

Added: sandbox/libs/extension/examples/value/Jamfile.v2
==============================================================================
--- (empty file)
+++ sandbox/libs/extension/examples/value/Jamfile.v2	2008-09-15 15:26:07 EDT (Mon, 15 Sep 2008)
@@ -0,0 +1 @@
+exe value : value.cpp ;
\ No newline at end of file

Added: sandbox/libs/extension/examples/value/shared.hpp
==============================================================================
--- (empty file)
+++ sandbox/libs/extension/examples/value/shared.hpp	2008-09-15 15:26:07 EDT (Mon, 15 Sep 2008)
@@ -0,0 +1,43 @@
+/*
+ * Boost.Extension
+ *
+ * (C) Copyright Jeremy Pack 2008
+ * Distributed under the Boost Software License, Version 1.0. (See             
+ * accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/ for latest version.
+ */
+
+#ifndef BOOST_EXTENSION_SHARED_HPP
+#define BOOST_EXTENSION_SHARED_HPP
+
+#include <boost/scoped_ptr.hpp>
+
+class generic_animal_impl {
+ public:
+  virtual ~generic_animal_impl() {}
+  virtual const std::string& get_name() const = 0;
+};
+
+template <class T>
+class animal_impl : public generic_animal_impl {
+ public:
+  animal_impl() : impl_(new T()) {}
+  virtual const std::string& get_name() const {
+    return impl_->get_name();
+  }
+  boost::scoped_ptr<T> impl_;
+};
+
+class any_animal {
+ public:
+  explicit any_animal(generic_animal_impl* a) : impl_(a) {
+  }
+  const std::string& get_name() const {
+    return impl_->get_name();
+  }
+  boost::scoped_ptr<generic_animal_impl> impl_;
+};
+
+#endif  // BOOST_EXTENSION_SHARED_HPP

Added: sandbox/libs/extension/examples/value/value.cpp
==============================================================================
--- (empty file)
+++ sandbox/libs/extension/examples/value/value.cpp	2008-09-15 15:26:07 EDT (Mon, 15 Sep 2008)
@@ -0,0 +1,34 @@
+/*
+ * Boost.Extension
+ *
+ * (C) Copyright Jeremy Pack 2008
+ * Distributed under the Boost Software License, Version 1.0. (See             
+ * accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/ for latest version.
+ */
+
+#include <iostream>
+
+#include <boost/extension/factory.hpp>
+
+#include "shared.hpp"
+
+class tiger {
+ public:
+  tiger () : name_("A ferocious tiger") {}
+  const std::string& get_name() const {
+    return name_;
+  }
+ private:
+  std::string name_;
+};
+
+int main() {
+  using namespace boost::extensions;
+  factory<generic_animal_impl> f;
+  f.set<animal_impl<tiger> >();
+  any_animal animal(f.create());
+  std::cout << animal.get_name() << std::endl;
+}