5086d5d74e
Adds a template class that wraps a std::unique_ptr and makes it copyable. See pull #714 in opm-models for a use case.
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
/*
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Copyright 2022 Equinor ASA.
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This file is part of the Open Porous Media project (OPM).
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OPM 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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OPM 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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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPM_COPYABLE_PTR_HPP
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#define OPM_COPYABLE_PTR_HPP
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namespace Opm {
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namespace Utility {
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// Wraps std::unique_ptr and makes it copyable.
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//
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// WARNING: This template should not be used with polymorphic classes.
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// That would require a virtual clone() method to be implemented.
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// It will only ever copy the static class type of the pointed to class.
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template <class T>
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class CopyablePtr {
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public:
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CopyablePtr() : ptr_(nullptr) {}
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CopyablePtr(const CopyablePtr& other) {
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if (other) { // other does not contain a nullptr
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ptr_ = std::make_unique<T>(*other.get());
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}
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else {
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ptr_ = nullptr;
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}
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}
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// assignment operator
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CopyablePtr<T>& operator=(const CopyablePtr<T>& other) {
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if (other) {
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ptr_ = std::make_unique<T>(*other.get());
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}
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else {
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ptr_ = nullptr;
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}
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return *this;
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}
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// assign directly from a unique_ptr
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CopyablePtr<T>& operator=(std::unique_ptr<T>&& uptr) {
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ptr_ = std::move(uptr);
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return *this;
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}
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// member access operator
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T* operator->() const {return ptr_.get(); }
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// boolean context operator
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explicit operator bool() const noexcept {
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return ptr_ ? true : false;
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}
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// get a pointer to the stored value
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T* get() const {return ptr_.get();}
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T* release() const {return ptr_.release();}
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private:
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std::unique_ptr<T> ptr_;
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};
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} // namespace Utility
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} // namespace Opm
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#endif |