From f37430cb52ff43c664d2eca08fa5ab51b0413925 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 8 May 2014 15:23:33 -0700
Subject: Add parser support for C++11 range-based for

---
 tests/parser/driver.cxx | 23 +++++++++++++++++++++++
 xml/parser.hxx          | 26 ++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/tests/parser/driver.cxx b/tests/parser/driver.cxx
index 3414c0c..a8230cd 100644
--- a/tests/parser/driver.cxx
+++ b/tests/parser/driver.cxx
@@ -7,6 +7,7 @@
 #endif
 
 #include <string>
+#include <vector>
 #include <cassert>
 #include <iostream>
 #include <sstream>
@@ -389,4 +390,26 @@ main ()
   {
     // cerr << e.what () << endl;
   }
+
+  // Test the iterator interface.
+  //
+  {
+    istringstream is ("<root><nested>X</nested></root>");
+    parser p (is, "iterator");
+
+    vector<parser::event_type> v;
+
+    for (parser::iterator i (p.begin ()); i != p.end (); ++i)
+      v.push_back (*i);
+
+    //for (parser::event_type e: p)
+    //  v.push_back (e);
+
+    assert (v.size () == 5);
+    assert (v[0] == parser::start_element);
+    assert (v[1] == parser::start_element);
+    assert (v[2] == parser::characters);
+    assert (v[3] == parser::end_element);
+    assert (v[4] == parser::end_element);
+  }
 }
diff --git a/xml/parser.hxx b/xml/parser.hxx
index c957b6d..2c42d4a 100644
--- a/xml/parser.hxx
+++ b/xml/parser.hxx
@@ -334,6 +334,32 @@ namespace xml
                  const std::string& ns, const std::string& name,
                  content_type);
 
+    // C++11 range-based for support. Generally, the iterator interface
+    // doesn't make much sense for the parser so for now we have an
+    // implementation that is just enough to the range-based for.
+    //
+  public:
+    struct iterator
+    {
+      typedef event_type value_type;
+
+      iterator (parser* p = 0, event_type e = eof): p_ (p), e_ (e) {}
+      value_type operator* () const {return e_;}
+      iterator& operator++ () {e_ = p_->next (); return *this;}
+
+      // Comparison only makes sense when comparing to end (eof).
+      //
+      bool operator== (iterator y) const {return e_ == eof && y.e_ == eof;}
+      bool operator!= (iterator y) const {return !(*this == y);}
+
+    private:
+      parser* p_;
+      event_type e_;
+    };
+
+    iterator begin () {return iterator (this, next ());}
+    iterator end () {return iterator (this, eof);}
+
   private:
     static void XMLCALL
     start_element_ (void*, const XML_Char*, const XML_Char**);
-- 
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