136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright (C) 2025 Medusa Slockbower
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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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//2
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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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// =====================================================================================================================
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#ifndef FENNEC_LANG_POINTERS_H
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#define FENNEC_LANG_POINTERS_H
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#include <fennec/lang/type_traits.h>
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namespace fennec
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{
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template<typename TypeT>
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struct default_delete
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{
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///
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/// \brief Default constructor
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constexpr default_delete() noexcept = default;
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///
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/// \brief Conversion Constructor
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/// \tparam ConvT of other deleter
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template<class ConvT> requires requires { can_convert<ConvT*, TypeT*>{}.value == true; }
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constexpr default_delete(const default_delete<ConvT>&) noexcept {}
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///
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/// \brief Function Call Operator, calls `delete` on `ptr`
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/// \param ptr Memory resource to delete
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constexpr void operator()(TypeT* ptr) const noexcept
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{
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static_assert(not is_void_v<TypeT>, "cannot delete a pointer to an incomplete type");
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static_assert(not sizeof(TypeT) > 0, "cannot delete a pointer to an incomplete type");
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delete ptr;
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}
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};
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template<typename TypeT>
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struct default_delete<TypeT[]>
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{
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///
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/// \brief Default constructor
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constexpr default_delete() noexcept = default;
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///
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/// \brief Conversion Constructor
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/// \tparam ConvT of other deleter
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template<class ConvT> requires requires { can_convert<ConvT(*)[], TypeT(*)[]>{}.value == true; }
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constexpr default_delete(const default_delete<ConvT(*)[]>&) noexcept {}
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///
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/// \brief Function Call Operator, calls `delete` on `ptr`
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/// \param ptr Memory resource to delete
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template<class ArrT> requires requires { can_convert<ArrT(*)[], TypeT(*)[]>{}.value == true; }
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constexpr void operator()(TypeT* ptr) const noexcept
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{
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static_assert(not is_void_v<TypeT>, "cannot delete a pointer to an incomplete type");
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static_assert(not sizeof(TypeT) > 0, "cannot delete a pointer to an incomplete type");
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delete[] ptr;
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}
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};
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template<typename TypeT, class DeleteT = default_delete<TypeT>>
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class unique_ptr
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{
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public:
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/// \brief the element type
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using element_t = TypeT;
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/// \brief pointer to element type
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using pointer_t = element_t*;
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/// \brief the deleter
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using delete_t = DeleteT;
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///
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/// \brief Default Constructor, creates a unique_ptr that owns nothing.
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constexpr unique_ptr() : unique_ptr(nullptr) {}
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///
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/// \brief Nullptr Constructor, creates a unique_ptr that owns nothing.
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constexpr unique_ptr(nullptr_t) noexcept : unique_ptr(nullptr) {}
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///
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/// \brief Pointer Constructor, creates a unique_ptr that owns `ptr` with deleter `del`
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/// \param ptr The resource to own
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/// \param del The deleter
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explicit constexpr unique_ptr(pointer_t ptr, const delete_t& del) : _delete(del), _handle(ptr) {}
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///
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/// \brief Pointer Constructor, creates a unique_ptr that owns `ptr` with deleter `del`
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/// \param ptr The resource to own
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/// \param del The deleter
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explicit constexpr unique_ptr(pointer_t ptr, delete_t&& del) : _delete(del), _handle(ptr) {}
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///
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/// \brief Move Constructor, transfers ownership from `other`
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/// \param other The unique_ptr to take ownership from
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constexpr unique_ptr(unique_ptr&& other) : _handle(other._handle) { other._handle = nullptr; }
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// Delete copy constructor
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constexpr unique_ptr(const unique_ptr&) = delete;
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///
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/// \brief Default Constructor, if it owns a resource, it deletes it using `delete_t`
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constexpr ~unique_ptr() { if(_handle) _delete(_handle); }
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constexpr unique_ptr& operator=(unique_ptr&& r) noexcept
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{ _handle = r._handle; r._handle = nullptr; return *this; }
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pointer_t release() { pointer_t retval = _handle; _handle = nullptr; return retval; }
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private:
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delete_t _delete;
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pointer_t _handle;
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};
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}
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#endif // FENNEC_LANG_POINTERS_H
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