Merge branch 'dfsg/latest' into debian/sid

1 files changed, 23 insertions, 0 deletions

diff --git a/src/Simplex_tree/concept/FiltrationValue.h b/src/Simplex_tree/concept/FiltrationValue.h
new file mode 100644
index 00000000..6cf314fa
--- /dev/null
+++ b/src/Simplex_tree/concept/FiltrationValue.h
@@ -0,0 +1,23 @@
+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Clément Maria
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+/** \brief Value type for a filtration function on a cell complex.
+  *
+  * A <EM>filtration</EM> of a cell complex (see FilteredComplex) is
+  * a function \f$f:\mathbf{K} \rightarrow \mathbb{R}\f$ satisfying \f$f(\tau)\leq 
+  * f(\sigma)\f$ whenever \f$\tau \subseteq \sigma\f$. Ordering the simplices 
+  * by increasing filtration values (breaking ties so as a simplex appears after 
+  * its subsimplices of same filtration value) provides an indexing scheme 
+  * (see IndexingTag).
+  */
+  struct FiltrationValue {
+    /** \brief Operator < is a StrictWeakOrdering. */
+    bool operator<(FiltrationValue f1, FiltrationValue f2);
+  };