Fix bug 3904

[lyx.git] / src / support / lyxalgo.h

diff --git a/src/support/lyxalgo.h b/src/support/lyxalgo.h
index dcbfd6d5d3bc4e195e7064e6bbf51097cc049748..19c2485a34241b9cf5ee51c69d92360b2a0e24d7 100644 (file)
--- a/src/support/lyxalgo.h
+++ b/src/support/lyxalgo.h
@@ -1,16 +1,16 @@
 // -*- C++ -*-
 /**
  * \file lyxalgo.h
- * Copyright 1995-2002 the LyX Team
- * Read the file COPYING
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
  *
- * A variety of useful templates.
+ * \author Lars Gullik Bjønnes
+ *
+ * Full author contact details are available in file CREDITS.
  *
- * \author unknown
+ * A variety of useful templates.
  */
 
- 
-
 #ifndef LYX_ALGO_H
 #define LYX_ALGO_H
 
@@ -18,6 +18,7 @@
 #include <iterator>
 #include <algorithm>
 
+
 namespace lyx {
 
 
@@ -56,7 +57,7 @@ struct firster {
 
 
 /**
- * copy elements in the given range to the output iterator 
+ * copy elements in the given range to the output iterator
  * if the predicate evaluates as true
  */
 template <class InputIter, class OutputIter, class Func>
@@ -80,13 +81,23 @@ count (Iterator first, Iterator last, T const & value)
 #ifdef HAVE_STD_COUNT
        return std::count(first, last, value);
 #else
-       std::iterator_traits<Iterator>::difference_type n = 0;
+       typename std::iterator_traits<Iterator>::difference_type n = 0;
        while (first != last)
                if (*first++ == value) ++n;
        return n;
 #endif
 }
 
+/// Remove all duplicate entries in c.
+template<class C>
+void eliminate_duplicates(C & c)
+{
+       // It is a requirement that the container is sorted for
+       // std::unique to work properly.
+       std::sort(c.begin(), c.end());
+       c.erase(std::unique(c.begin(), c.end()), c.end());
+}
+
 } // namespace lyx
 
 #endif // LYX_ALGO_H