BitSet initializer constructors

CMakeLists.txt

@@ -106,6 +106,7 @@ set(HEADERS
     include/vclib/concepts/pointers.h
     include/vclib/concepts/range.h
     include/vclib/concepts/space.h
+    include/vclib/concepts/types.h
     include/vclib/concepts/mesh/components.h
     include/vclib/concepts/mesh/containers.h
     include/vclib/concepts/mesh/edge_mesh_concept.h

include/vclib/concepts.h

@@ -30,6 +30,7 @@
 #include "concepts/pointers.h"
 #include "concepts/range.h"
 #include "concepts/space.h"
+#include "concepts/types.h"
 
 /**
  * @defgroup concepts Concepts

include/vclib/concepts/types.h

@@ -0,0 +1,46 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2023                                                    *
+ * Alessandro Muntoni                                                        *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the GNU General Public License as published by      *
+ * the Free Software Foundation; either version 3 of the License, or         *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program 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              *
+ * GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
+ * for more details.                                                         *
+ ****************************************************************************/
+
+#ifndef VCL_CONCEPTS_TYPES_H
+#define VCL_CONCEPTS_TYPES_H
+
+#include <concepts>
+
+namespace vcl {
+
+/**
+ * @brief Concept for types that can be used as indices.
+ */
+template<typename T>
+concept IntegralOrEnum = std::integral<T> || std::is_enum_v<T>;
+
+
+/**
+ * @brief Concept for types that can be used as indices, excluding bool.
+ */
+template<typename T>
+concept NonBoolIntegralOrEnum = IntegralOrEnum<T> && !std::same_as<T, bool>;
+
+} // namespace vcl
+
+#endif // VCL_CONCEPTS_TYPES_H

include/vclib/space/bit_set.h

@@ -27,6 +27,8 @@
 #include <stdexcept>
 #include <string>
 
+#include <vclib/concepts/types.h>
+
 #include "bit_set/bit_proxy.h"
 
 namespace vcl {
@@ -60,7 +62,46 @@ class BitSet
     /**
      * @brief Empty constructor. All the Bits of the BitSet are set to false.
      */
-    BitSet() {}
+    BitSet() = default;
+
+    /**
+     * @brief Constructor from list of integral (or enum) values that represent
+     * the indices of the true bits, allowing braces initialization.
+     *
+     * Creates a BitSet by setting to true the bits at the indices specified in
+     * the list. All the other bits are set to false. Each value of the list
+     * must be less than the number of bits of the BitSet.
+     *
+     * @param[in] l: the list of bit positions to set to true.
+     */
+    template<NonBoolIntegralOrEnum I>
+    BitSet(std::initializer_list<I> l)
+    {
+        for (const auto& i : l)
+            at(i) = true;
+    }
+
+    /**
+     * @brief Constructor from a list of boolean values, allowing braces
+     * initialization.
+     *
+     * Constructs the bitset from the list of boolean values. The size of the
+     * list must be less or equal to the number of bits of the BitSet.
+     *
+     * @param[in] l: the list of boolean values to assign to the BitSet.
+     */
+    template<typename B>
+    BitSet(std::initializer_list<B> l) requires std::same_as<bool, B>
+    {
+        if (l.size() > SIZE)
+            throw std::invalid_argument(
+                "BitSet: list size is greater than the number of bits of the "
+                "BitSet");
+
+        uint i = 0;
+        for (const auto& b : l)
+            at(i++) = b;
+    }
 
     /**
      * @brief Returns the number of bits of the BitSet.
@@ -200,6 +241,8 @@ class BitSet
         at(i) = !at(i);
         return *this;
     }
+
+    auto operator<=>(const BitSet<T>&) const = default;
 };
 
 /* Specialization Aliases */