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+/**++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ *
+ *                                              PANIC
+ *                              Portable Algorithms and Numerics In C++
+ *
+ *                       Scientific computing from scratch, with feeling.
+ *
+ * Copyright (c) 2026 Michelle Bausager
+ *
+ * This file is part of PANIC.
+ *
+ * PANIC is free software licensed under the GNU General Public License v3.0 or later.
+ * You may redistribute and/or modify it under the terms of the GPL.
+ *
+ * PANIC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the LICENSE file for the full license text.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ *
+ * Project Name:      PANIC
+ * Module Name:       config
+ * File Name:         constants.hpp
+ * Revision:          0.1.0
+ * Date:              20-06-2026
+ * Author:            Michelle Bausager
+ *
+ * Description:
+ * Defines which types will be used in the rest of the libraries.
+ *
+ *++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+#pragma once
+
+//---------------------------------------------------------------------------------------------------------------------------
+// INCLUDE DESCRIPTION
+//---------------------------------------------------------------------------------------------------------------------------
+#include <config/types.hpp> // Use to define types. 
+
+//---------------------------------------------------------------------------------------------------------------------------
+// DEFINE DESCRIPTION
+//---------------------------------------------------------------------------------------------------------------------------
+
+//---------------------------------------------------------------------------------------------------------------------------
+// TYPE DESCRIPTION
+//---------------------------------------------------------------------------------------------------------------------------
+
+//---------------------------------------------------------------------------------------------------------------------------
+// VARIABLE DESCRIPTION
+//---------------------------------------------------------------------------------------------------------------------------
+namespace panic {
+
+	//---------------------------------------------------------------------------------------------------------------------------
+	// Type Name : panic::pi
+	//
+	// Description:
+	//   Default difinition of pi (3.14159265358979323846) used inside PANIC.
+	//   static_cast makes sure the right number of decimals are used when defining the constant.
+	//
+	// Underlying Type:
+	//   panic::real_t
+	//---------------------------------------------------------------------------------------------------------------------------
+	static const panic::real_t pi  	= static_cast<panic::real_t>(3.14159265358979323846);
+	//---------------------------------------------------------------------------------------------------------------------------
+	//
+	// Type Name : panic::tau
+	//
+	// Description:
+	//   Default difinition of tau (6.28318530717958647692) used inside PANIC.
+	//   static_cast makes sure the right number of decimals are used when defining the constant.
+	//
+	// Underlying Type:
+	//   panic::real_t
+	//---------------------------------------------------------------------------------------------------------------------------
+	static const panic::real_t tau 	= static_cast<panic::real_t>(6.28318530717958647692);
+	//---------------------------------------------------------------------------------------------------------------------------
+	//
+	// Type Name : panic::e
+	//
+	// Description:
+	//   Default difinition of eulers number, e (2.71828182845904523536) used inside PANIC.
+	//   static_cast makes sure the right number of decimals are used when defining the constant.
+	//
+	// Underlying Type:
+	//   panic::real_t
+	//---------------------------------------------------------------------------------------------------------------------------
+	static const panic::real_t e   	= static_cast<panic::real_t>(2.71828182845904523536);
+
+} // namespace panic
+
+//---------------------------------------------------------------------------------------------------------------------------
+// FUNCTION PROTOTYPE
+//---------------------------------------------------------------------------------------------------------------------------
+
+