95 lines
1.5 KiB
C++
95 lines
1.5 KiB
C++
#ifndef __unique_resource_h__
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#define __unique_resource_h__
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#include <utility>
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template <class T, class D>
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class unique_resource {
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public:
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typedef T element_type;
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typedef D deleter_type;
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unique_resource() = default;
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unique_resource(const unique_resource &) = delete;
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unique_resource(unique_resource &&rhs) {
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swap(rhs);
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}
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unique_resource(T t, D d): _pair(t,d), _active(true)
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{}
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~unique_resource() {
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reset();
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}
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unique_resource &operator=(const unique_resource &) = delete;
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unique_resource &operator=(unique_resource &&rhs) {
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if (this != std::addressof(rhs)) {
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reset();
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swap(rhs);
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}
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return *this;
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}
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void swap(unique_resource & rhs) {
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if (this != std::addressof(rhs)) {
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std::swap(_active, rhs._active);
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std::swap(_pair, rhs._pair);
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}
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}
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void reset(T t) {
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reset();
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_active = true;
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_pair.first = t;
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}
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void reset(T t, D d) {
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reset();
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_active = true;
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_pair = std::make_pair(t, d);
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}
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void reset() {
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if (_active) {
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(*_pair.second)(_pair.first);
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_active = false;
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}
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}
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T release() {
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_active = false;
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return _pair.first;;
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}
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T get() {
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return _pair.first;
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}
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operator bool() const {
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return _active;
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}
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D& get_deleter() {
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return _pair.second;
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}
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const D& get_deleter() const {
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return _pair.second;
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}
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private:
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std::pair<T, D> _pair;
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bool _active = false;
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};
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#define MAKE_UNIQUE_RESOURCE(T, D) \
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unique_resource<decltype(T), decltype(D) *>(T, D)
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template<class T, class D>
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unique_resource<T, D> make_unique_resource(T t, D d) {
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return unique_resource<T, D>(t, d);
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}
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#endif |