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/value_factory_args.cpp

@@ -0,0 +1,40 @@
+/*
+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/value_factory.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+class sum {
+public:
+    explicit sum(int a = 0, int b = 0, int c = 0, int d = 0,
+                 int e = 0, int f = 0, int g = 0, int h = 0,
+                 int i = 0, int j = 0, int k = 0, int l = 0)
+        : value_(a + b + c + d + e + f + g + h + i + j + k + l) { }
+
+    int get() const {
+        return value_;
+    }
+
+private:
+    int value_;
+};
+
+int main()
+{
+    sum s(boost::value_factory<sum>()(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12));
+    BOOST_TEST(s.get() == 78);
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif