init

include/util/ptr.hpp

@@ -0,0 +1,53 @@
+// Display images inside a terminal
+// Copyright (C) 2023  JustKidding
+//
+// 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 for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef UTIL_PTR_H
+#define UTIL_PTR_H
+
+#include <memory>
+
+template <auto fn>
+struct deleter_from_fn {
+    template <typename T>
+    constexpr void operator()(T *arg) const
+    {
+        fn(const_cast<std::remove_const_t<T> *>(arg));
+    }
+};
+
+template <auto fn>
+struct deleter_from_fn_null {
+    template <typename T>
+    constexpr void operator()(T *arg) const
+    {
+        if (arg != nullptr) {
+            fn(const_cast<std::remove_const_t<T> *>(arg));
+        }
+    }
+};
+
+// custom unique pointer
+template <typename T, auto fn>
+using c_unique_ptr = std::unique_ptr<T, deleter_from_fn<fn>>;
+
+// custom unique pointer that checks for null before deleting
+template <typename T, auto fn>
+using cn_unique_ptr = std::unique_ptr<T, deleter_from_fn_null<fn>>;
+
+template <typename T>
+using unique_C_ptr = std::unique_ptr<T, deleter_from_fn<std::free>>;
+
+#endif