From ec9953f0dbe0f69074f25cc95442ea0012db7d98 Mon Sep 17 00:00:00 2001
From: Siargey Kachanovich <siargey.kachanovich@inria.fr>
Date: Thu, 17 Oct 2019 21:40:20 +0200
Subject: Added the files from the coxeter branch

---
 .../include/gudhi/Functions/Constant_function.h    | 71 ++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/Coxeter_triangulation/include/gudhi/Functions/Constant_function.h

(limited to 'src/Coxeter_triangulation/include/gudhi/Functions/Constant_function.h')

diff --git a/src/Coxeter_triangulation/include/gudhi/Functions/Constant_function.h b/src/Coxeter_triangulation/include/gudhi/Functions/Constant_function.h
new file mode 100644
index 00000000..ea354fac
--- /dev/null
+++ b/src/Coxeter_triangulation/include/gudhi/Functions/Constant_function.h
@@ -0,0 +1,71 @@
+/*    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_CONSTANT_FUNCTION_H_
+#define FUNCTIONS_CONSTANT_FUNCTION_H_
+
+#include <gudhi/Functions/Function.h>
+#include <Eigen/Dense>
+
+namespace Gudhi {
+
+namespace coxeter_triangulation {
+
+/** 
+ * \class Constant_function 
+ * \brief A class that encodes a constant function from R^d to R^k.
+ * This class does not have any implicit manifold in correspondence.
+ *
+ * \ingroup coxeter_triangulation
+ */
+struct Constant_function : public Function {
+
+  /** \brief Value of the function at a specified point. The value is constant.
+   * @param[in] p The input point. The dimension needs to coincide with the ambient dimension.
+   */
+  Eigen::VectorXd operator()(const Eigen::VectorXd& p) const {
+    Eigen::VectorXd result = value_;
+    return result;
+  }
+  
+  /** \brief Returns the domain dimension. Same as the ambient dimension of the sphere. */
+  std::size_t amb_d() const {return d_;};
+
+  /** \brief Returns the codomain dimension. Same as the codimension of the sphere. */
+  std::size_t cod_d() const {return k_;};
+
+  /** \brief No seed point is available. Throws an exception on evocation. */
+  Eigen::VectorXd seed() const {
+    throw "Seed invoked on a constant function.\n";
+  }
+
+  Constant_function() {}
+  
+  /** 
+   * \brief Constructor of a constant function from R^d to R^m.
+   *
+   * @param[in] d The domain dimension.
+   * @param[in] k The codomain dimension.
+   * @param[in] value The constant value of the function.
+   */
+  Constant_function(std::size_t d, std::size_t k, const Eigen::VectorXd& value)
+    : d_(d), k_(k), value_(value) {}
+  
+  std::size_t d_, k_;
+  Eigen::VectorXd value_;
+};
+
+} // namespace coxeter_triangulation
+
+} // namespace Gudhi
+
+#endif
-- 
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