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Update "add_two" example to get generic

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This commit is contained in:
Jason Turner
2009-06-05 13:15:58 +00:00
parent 42b4891969
commit 00a5f32a46
1 changed files with 16 additions and 3 deletions
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19
wesley/main.cpp
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@@ -79,8 +79,18 @@ std::string concat_string(const std::string &s1, const std::string &s2) {
return s1+s2; return s1+s2;
} }
const Boxed_Value add_two(const Boxed_Value &val1, const Boxed_Value &val2) { const Boxed_Value add_two(BoxedCPP_System &ss, const std::vector<Boxed_Value> &vals) {
return Boxed_Value(1); //We can check the arity if we want, or in this case just allow the dispatch
//to do it for us:
if (vals.size() != 2)
{
//I very much need to do a cleanup and provide a custom set of
//bad_cast and wrong_arity exceptions so they can be caught more
//cleanly
throw std::runtime_error("Wrong number of args");
}
return dispatch(ss.get_function("+"), vals);
} }
std::string load_file(const char *filename) { std::string load_file(const char *filename) {
@@ -446,7 +456,10 @@ BoxedCPP_System build_eval_system() {
ss.register_function(boost::function<void (const std::string &)>(&print<std::string>), "print"); ss.register_function(boost::function<void (const std::string &)>(&print<std::string>), "print");
ss.register_function(boost::function<void (const double &)>(&print<double>), "print"); ss.register_function(boost::function<void (const double &)>(&print<double>), "print");
ss.register_function(boost::function<std::string (const std::string &, const std::string &)>(concat_string), "concat_string"); ss.register_function(boost::function<std::string (const std::string &, const std::string &)>(concat_string), "concat_string");
ss.register_function(boost::function<Boxed_Value (Boxed_Value, Boxed_Value)>(add_two), "add_two");
ss.register_function(boost::shared_ptr<Proxy_Function>(
new Dynamic_Proxy_Function(boost::bind(&add_two, boost::ref(ss), _1))), "add_two");
return ss; return ss;
} }