From fbb9534601fcdb6cee85654f8105f34244c004ef Mon Sep 17 00:00:00 2001
From: Jason Turner <lefticus@gmail.com>
Date: Wed, 27 May 2009 13:30:17 +0000
Subject: [PATCH] Provide some cleaner examples and some additional
 bootstrapped functions

---
 boxedcpp/boxedcpp.hpp        | 19 +++++++++++++++++
 boxedcpp/proxy_functions.hpp | 22 +++++++++++++++++++
 boxedcpp/test.cpp            | 41 +++++++++++++++++++++++++++---------
 3 files changed, 72 insertions(+), 10 deletions(-)

diff --git a/boxedcpp/boxedcpp.hpp b/boxedcpp/boxedcpp.hpp
index 139a231..8ae8543 100644
--- a/boxedcpp/boxedcpp.hpp
+++ b/boxedcpp/boxedcpp.hpp
@@ -5,6 +5,7 @@
 #include <string>
 #include <map>
 #include <boost/shared_ptr.hpp>
+#include <boost/lexical_cast.hpp>
 #include <stdexcept>
 #include <vector>
 
@@ -25,6 +26,11 @@ class BoxedCPP_System
         m_functions.insert(std::make_pair(name, boost::shared_ptr<Proxy_Function>(new Proxy_Function_Impl<Function>(func))));
       }
 
+    void register_function(const boost::shared_ptr<Proxy_Function> &f, const std::string &name)
+    {
+      m_functions.insert(std::make_pair(name, f));
+    }
+
     template<typename Class>
       void add_object(const std::string &name, const Class &obj)
       {
@@ -134,12 +140,18 @@ Ret multiply(const P1 &p1, const P2 &p2)
   return p1 * p2;
 }
 
+template<typename Input>
+std::string to_string(const Input &i)
+{
+  return boost::lexical_cast<std::string>(i);
+}
 
 void bootstrap(BoxedCPP_System &s)
 {
   s.register_type<void>("void");
   s.register_type<double>("double");
   s.register_type<int>("int");
+  s.register_type<char>("char");
   s.register_type<std::string>("string");
 
   s.register_function(boost::function<std::string (std::string, std::string)>(&add<std::string, std::string, std::string>), "+");
@@ -153,6 +165,13 @@ void bootstrap(BoxedCPP_System &s)
   s.register_function(boost::function<double (int, double)>(&multiply<double, int, double>), "*");
   s.register_function(boost::function<double (double, int)>(&multiply<double, double, int>), "*");
   s.register_function(boost::function<double (double, double)>(&multiply<double, double, double>), "*");
+
+  s.register_function(boost::function<std::string (int)>(&to_string<int>), "to_string");
+  s.register_function(boost::function<std::string (const std::string &)>(&to_string<const std::string &>), "to_string");
+  s.register_function(boost::function<std::string (char)>(&to_string<char>), "to_string");
+  s.register_function(boost::function<std::string (double)>(&to_string<double>), "to_string");
+
+
 }
 
 #endif 
diff --git a/boxedcpp/proxy_functions.hpp b/boxedcpp/proxy_functions.hpp
index 20eb695..4453a35 100644
--- a/boxedcpp/proxy_functions.hpp
+++ b/boxedcpp/proxy_functions.hpp
@@ -103,6 +103,28 @@ class Proxy_Function
 
 };
 
+class Dynamic_Proxy_Function : public Proxy_Function
+{
+  public:
+    Dynamic_Proxy_Function(const boost::function<Boxed_Value (const std::vector<Boxed_Value> &)> &t_f)
+      : m_f(t_f)
+    {
+    }
+
+    virtual Boxed_Value operator()(const std::vector<Boxed_Value> &params)
+    {
+      return m_f(params);
+    }
+
+    virtual std::vector<Type_Info> get_param_types()
+    {
+      return build_param_type_list(m_f);
+    }
+
+  private:
+    boost::function<Boxed_Value (const std::vector<Boxed_Value> &)> m_f;
+};
+
 template<typename Func>
 class Proxy_Function_Impl : public Proxy_Function
 {
diff --git a/boxedcpp/test.cpp b/boxedcpp/test.cpp
index d96bd6b..e5023fb 100644
--- a/boxedcpp/test.cpp
+++ b/boxedcpp/test.cpp
@@ -40,15 +40,9 @@ struct Test
   double md;
 };
 
-std::string testprint(const std::string &p)
+void print(const std::string &s)
 {
-  std::cout << p << std::endl;
-  return p;
-}
-
-void print()
-{
-  std::cout << "Test void function succeeded" << std::endl;
+  std::cout << "Printed: " << s << std::endl;
 }
 
 
@@ -57,7 +51,35 @@ int main()
 {
   BoxedCPP_System ss;
   bootstrap(ss);
+  dump_system(ss);
+ 
+  //Calling a function by name and allowing the built in dispatch mechanism to
+  //choose the most appropriate version of the function
+  Boxed_Value addresult = dispatch(ss.get_function("+"), Param_List_Builder() << double(5.1) << double(10.3)); 
 
+  //Using the Cast_Helper to unbox the resultant value and output it
+  std::cout << Cast_Helper<double>()(addresult) << std::endl;
+
+  //Using the Boxed_Value as input to another function, again with automatic dispatch.
+  //This time we will not bother saving the result and will instead send it straight out
+  std::cout << Cast_Helper<double>()(
+      dispatch(ss.get_function("*"), Param_List_Builder() << 2 << addresult)
+      ) << std::endl; 
+
+  //Register a new function, this one with typing for us, so we don't have to ubox anything
+  //right here
+  ss.register_function(boost::function<void (const std::string &)>(&print), "print");
+
+  //Now we have a print method, let's try to print out the earlier example:
+  //so, we dispatch the to_string and pass its result as a param to "print"
+  //In this example we don't bother with temporaries and we don't have to know
+  //anything about types
+  dispatch(ss.get_function("print"), 
+      Param_List_Builder() << dispatch(ss.get_function("to_string"), Param_List_Builder() << addresult));
+
+  //
+  //
+  /* Older tests
   ss.register_type<Test>("Test");
   ss.register_function(boost::function<int (Test*, double)>(&Test::method), "method");
   ss.register_function(boost::function<std::string (const std::string &)>(&testprint), "print");
@@ -72,8 +94,6 @@ int main()
   ss.add_object("str", std::string("Hello World"));
 
 
-  dump_system(ss);
-
 
   std::vector<Boxed_Value> sos;
   sos.push_back(ss.get_object("testobj")); 
@@ -103,5 +123,6 @@ int main()
   sr = "Bob Updated The message";
   
   dispatch(ss.get_function("show_message"), sos3);
+  */
 }