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-rw-r--r--xsd/examples/cxx/parser/mixin/driver.cxx104
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diff --git a/xsd/examples/cxx/parser/mixin/driver.cxx b/xsd/examples/cxx/parser/mixin/driver.cxx
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+// file : examples/cxx/parser/mixin/driver.cxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>
+#include <iostream>
+
+#include "types.hxx"
+#include "schema-pskel.hxx"
+
+using namespace std;
+
+struct base_pimpl: virtual base_pskel
+{
+ virtual void
+ pre ()
+ {
+ base_.reset (new ::base);
+ }
+
+ virtual void
+ a (bool v)
+ {
+ base_->a (v);
+ }
+
+ virtual base*
+ post_base ()
+ {
+ return base_.release ();
+ }
+
+protected:
+ auto_ptr<base> base_;
+};
+
+// Implement derived parser by mixing-in base's implementation.
+//
+struct derived_pimpl: derived_pskel, base_pimpl
+{
+ virtual void
+ pre ()
+ {
+ // Override base's pre() with the new implementation that
+ // instantiates derived instead of base.
+ //
+ base_.reset (new ::derived);
+ }
+
+ virtual void
+ b (int v)
+ {
+ // We could also store a pointer to derived in derived_impl to
+ // avoid casting.
+ //
+ static_cast< ::derived* > (base_.get ())->b (v);
+ }
+
+ virtual derived*
+ post_derived ()
+ {
+ return static_cast<derived*> (base_.release ());
+ }
+};
+
+int
+main (int argc, char* argv[])
+{
+ if (argc != 2)
+ {
+ cerr << "usage: " << argv[0] << " instance.xml" << endl;
+ return 1;
+ }
+
+ try
+ {
+ // Construct the parser.
+ //
+ xml_schema::boolean_pimpl bool_p;
+ xml_schema::int_pimpl int_p;
+ derived_pimpl derived_p;
+
+ derived_p.parsers (bool_p, int_p);
+
+ xml_schema::document doc_p (derived_p, "root");
+
+ derived_p.pre ();
+ doc_p.parse (argv[1]);
+ auto_ptr<derived> d (derived_p.post_derived ());
+
+ cerr << "a: " << boolalpha << d->a () << endl;
+ cerr << "b: " << d->b () << endl;
+ }
+ catch (const xml_schema::exception& e)
+ {
+ cerr << e << endl;
+ return 1;
+ }
+ catch (const std::ios_base::failure&)
+ {
+ cerr << argv[1] << ": unable to open or read failure" << endl;
+ return 1;
+ }
+}