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_default_allocator.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/functional/factory.hpp>
+#include <boost/core/default_allocator.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/shared_ptr.hpp>
+#include <exception>
+
+#if defined(BOOST_NO_EXCEPTIONS)
+namespace boost {
+
+void throw_exception(const std::exception&)
+{
+    std::terminate();
+}
+
+}
+#endif
+
+class sum  {
+public:
+    sum(int a, int b)
+        : value_(a + b) { }
+
+    int get() const {
+        return value_;
+    }
+
+private:
+    int value_;
+};
+
+int main()
+{
+    int a = 1;
+    int b = 2;
+    {
+        boost::shared_ptr<sum> s(boost::factory<boost::shared_ptr<sum>,
+            boost::default_allocator<void>,
+            boost::factory_alloc_for_pointee_and_deleter>()(a, b));
+        BOOST_TEST(s->get() == 3);
+    }
+    {
+        boost::shared_ptr<sum> s(boost::factory<boost::shared_ptr<sum>,
+            boost::default_allocator<void>,
+            boost::factory_passes_alloc_to_smart_pointer>()(a, b));
+        BOOST_TEST(s->get() == 3);
+    }
+    return boost::report_errors();
+}