v01

include/basalt/utils/cast_utils.hpp

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+/**
+BSD 3-Clause License
+
+This file is part of the Basalt project.
+https://gitlab.com/VladyslavUsenko/basalt.git
+
+Copyright (c) 2021, Vladyslav Usenko and Nikolaus Demmel.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#pragma once
+
+#include <type_traits>
+
+namespace basalt {
+
+template <class I>
+typename std::make_signed_t<I> signed_cast(I v) {
+  static_assert(std::is_unsigned_v<I>, "no unsigned");
+  return static_cast<typename std::make_signed_t<I>>(v);
+}
+
+template <class I>
+typename std::make_unsigned_t<I> unsigned_cast(I v) {
+  static_assert(std::is_signed_v<I>, "no signed");
+  return static_cast<typename std::make_unsigned_t<I>>(v);
+}
+
+// copy-assign map while casting Scalar type of values
+template <class M1, class M2>
+void assign_cast_map_values(M1& a, const M2& b) {
+  using Scalar = typename M1::mapped_type::Scalar;
+  a.clear();
+  for (const auto& [k, v] : b) {
+    a.try_emplace(k, v.template cast<Scalar>());
+  }
+}
+
+}  // namespace basalt