From 76a88922acfa0342af8c8b08435b6cefa6abdd50 Mon Sep 17 00:00:00 2001
From: Davi de Castro Reis <davi.reis@gmail.com>
Date: Thu, 4 Nov 2010 22:57:41 -0200
Subject: [PATCH] Added iterator first.

---
 cxxmph/iterator_first.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 cxxmph/iterator_first.h

diff --git a/cxxmph/iterator_first.h b/cxxmph/iterator_first.h
new file mode 100644
index 0000000..d8350af
--- /dev/null
+++ b/cxxmph/iterator_first.h
@@ -0,0 +1,12 @@
+template <typename iterator>
+struct iterator_first : public iterator {
+  iterator_first(iterator it) : iterator(it) { }
+  const typename iterator::value_type::first_type& operator*() const {
+    return this->iterator::operator*().first;
+  }
+};
+
+template <typename iterator>
+iterator_first<iterator> make_iterator_first(iterator it) {
+  return iterator_first<iterator>(it);
+}