Hi, I was going to provide a (late) review for the named parameter lib, but I have some questions before I can do that. 1) I find the use of the name "keyword" for the type of the named parameter somehow odd. It does not seem to fit with what I associate with keywords. What's the rationale behind that choice. 2) The docs give the following example for mixing named and positional parameters: foo("bar", 3.14f); foo(value = 6.28f, "baz") Should print: bar = 3.14 baz = 6.28 I believe the parameter deduction in this case is too smart. Is there a way for the user of the library to enforce a rule like "No positional param after named params" on a case by case basis? 3) Section 5 has the following example // implementation of bar() template <class Params> void bar_impl(Params const& params) { // Extract arguments float x_ = params[x]; float theta_ = params[theta | pi]; float span = params[span || boost::bind(default_span, x_, theta_)]; //!! ^^^^ ^^^^ ... } IIUC this does not work. I assume the second span should refer to a named paramter object. I think it refers to the local span object. Did I miss something? Regards Thomas PS: Doug I know I am late, feel free to ignore me. -- Thomas Witt witt@acm.org