From a8ce5c380c69539fe0c7c62c397634d9d0c9fde2 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Fri, 18 Dec 2020 18:48:46 +0300
Subject: Switch to build2

---
 xsd-examples/cxx/parser/mixin/driver.cxx | 103 +++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 xsd-examples/cxx/parser/mixin/driver.cxx

(limited to 'xsd-examples/cxx/parser/mixin/driver.cxx')

diff --git a/xsd-examples/cxx/parser/mixin/driver.cxx b/xsd-examples/cxx/parser/mixin/driver.cxx
new file mode 100644
index 0000000..7a5ac94
--- /dev/null
+++ b/xsd-examples/cxx/parser/mixin/driver.cxx
@@ -0,0 +1,103 @@
+// file      : cxx/parser/mixin/driver.cxx
+// 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:
+  unique_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]);
+    unique_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;
+  }
+}
-- 
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