Rewrite factory and value_factory

- Support r-value arguments
- Use variadic templates for arbitrary arguments
- Support allocators that are final
- Support allocators that use fancy pointers
- Support environments with disabled exceptions
- Improve compilation times

factory/test/factory_move.cpp

@@ -0,0 +1,55 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
+    !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+#include <boost/functional/factory.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/smart_ptr/scoped_ptr.hpp>
+
+class arg {
+public:
+    explicit arg(int n)
+        : value_(n) { }
+
+    arg(arg&& a)
+        : value_(a.value_) { }
+
+    int get() const {
+        return value_;
+    }
+
+private:
+    int value_;
+};
+
+class sum {
+public:
+    explicit sum(arg&& a1, arg&& a2)
+        : value_(a1.get() + a2.get()) { }
+
+    int get() const {
+        return value_;
+    }
+
+private:
+    int value_;
+};
+
+int main()
+{
+    boost::scoped_ptr<sum> s(boost::factory<sum*>()(arg(1), arg(2)));
+    BOOST_TEST(s->get() == 3);
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif