54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
// Display images inside a terminal
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// Copyright (C) 2023 JustKidding
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#ifndef UTIL_PTR_H
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#define UTIL_PTR_H
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#include <memory>
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template <auto fn>
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struct deleter_from_fn {
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template <typename T>
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constexpr void operator()(T *arg) const
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{
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fn(const_cast<std::remove_const_t<T> *>(arg));
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}
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};
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template <auto fn>
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struct deleter_from_fn_null {
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template <typename T>
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constexpr void operator()(T *arg) const
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{
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if (arg != nullptr) {
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fn(const_cast<std::remove_const_t<T> *>(arg));
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}
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}
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};
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// custom unique pointer
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template <typename T, auto fn>
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using c_unique_ptr = std::unique_ptr<T, deleter_from_fn<fn>>;
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// custom unique pointer that checks for null before deleting
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template <typename T, auto fn>
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using cn_unique_ptr = std::unique_ptr<T, deleter_from_fn_null<fn>>;
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template <typename T>
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using unique_C_ptr = std::unique_ptr<T, deleter_from_fn<std::free>>;
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#endif
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