From cd15371fcf9ec37421273e64a5058caeb255503f Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Fri, 11 Mar 2016 12:44:00 +1100
Subject: [PATCH] iterator: add infix_iterator

---
 iterator.hpp | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/iterator.hpp b/iterator.hpp
index 22e831a3..82a8a640 100644
--- a/iterator.hpp
+++ b/iterator.hpp
@@ -67,4 +67,45 @@ class referencing_iterator {
 
 };
 
+
+namespace util {
+    template <
+        typename T,
+        class CharT = char,
+        class Traits = std::char_traits<CharT>
+    >
+    class infix_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> {
+    public:
+        using char_type    = CharT;
+        using traits_type  = Traits;
+        using ostream_type = std::basic_ostream<char_type, traits_type>;
+
+        infix_iterator (ostream_type& _output, const CharT *_delimiter):
+            m_output (_output),
+            m_delimiter (_delimiter)
+        { ; }
+
+        infix_iterator&
+        operator= (const T &value)
+        {
+            if (!m_first)
+                m_output << m_delimiter;
+
+            m_output << value;
+            m_first = false;
+
+            return *this;
+        }
+
+        infix_iterator& operator*  (void) { return *this; }
+        infix_iterator& operator++ (void) { return *this; }
+        infix_iterator& operator++ (int)  { return *this; }
+
+    private:
+        bool m_first = true;
+        ostream_type &m_output;
+        const CharT *m_delimiter;
+    };
+}
+
 #endif