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diff --git a/src/Coxeter_triangulation/include/gudhi/Functions/Function.h b/src/Coxeter_triangulation/include/gudhi/Functions/Function.h
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+++ b/src/Coxeter_triangulation/include/gudhi/Functions/Function.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       Siargey Kachanovich
+ *
+ *    Copyright (C) 2019 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef FUNCTIONS_FUNCTION_H_
+#define FUNCTIONS_FUNCTION_H_
+
+#include <Eigen/Dense>
+
+namespace Gudhi {
+
+namespace coxeter_triangulation {
+
+/** 
+ * \class Function
+ * \brief The parent class for all functions implemented in the module.
+ *  Contains virtual methods needed to be a model of the concept FunctionForImplicitManifold.
+ *
+ * \ingroup coxeter_triangulation
+ */
+struct Function {
+  
+  /** \brief Virtual method for the value of the function at a specified point.
+   * @param[in] p The input point.
+   */
+  virtual Eigen::VectorXd evaluate(const Eigen::VectorXd& p) const {return Eigen::VectorXd(0);}
+  
+  /** \brief Virtual method for the domain dimension. */
+  virtual std::size_t amb_d() const {return 0;};
+
+  /** \brief Virtual method for the codomain dimension. */
+  virtual std::size_t cod_d() const {return 0;};
+
+  /** \brief Virtual method for the seed point. */
+  virtual Eigen::VectorXd seed() const {return Eigen::VectorXd(0);}
+
+  /** \brief Virtual destructor. */
+  virtual ~Function() {}
+};
+
+} // namespace coxeter_triangulation
+
+} // namespace Gudhi
+
+
+#endif