new-envwith_gc
Last change
on this file since 28f3a19 was
f4e3419d,
checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
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restructure paper documents
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-
Property mode set to
100644
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File size:
1.1 KB
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Line | |
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1 | #pragma once |
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2 | #include <utility> |
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3 | |
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4 | template<typename T> class stack { |
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5 | struct node { |
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6 | T value; |
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7 | node* next; |
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8 | |
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9 | node( const T& v, node* n = nullptr ) : value(v), next(n) {} |
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10 | }; |
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11 | node* head; |
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12 | |
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13 | void copy(const stack<T>& o) { |
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14 | node** crnt = &head; |
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15 | for ( node* next = o.head; next; next = next->next ) { |
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16 | *crnt = new node{ next->value }; /***/ |
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17 | crnt = &(*crnt)->next; |
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18 | } |
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19 | *crnt = nullptr; |
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20 | } |
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21 | public: |
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22 | void clear() { |
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23 | for ( node* next = head; next; ) { |
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24 | node* crnt = next; |
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25 | next = crnt->next; |
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26 | delete crnt; |
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27 | } |
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28 | head = nullptr; |
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29 | } |
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30 | |
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31 | stack() : head(nullptr) {} |
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32 | stack(const stack<T>& o) { copy(o); } |
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33 | stack(stack<T>&& o) : head(o.head) { o.head = nullptr; } |
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34 | ~stack() { clear(); } |
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35 | |
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36 | stack& operator= (const stack<T>& o) { |
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37 | if ( this == &o ) return *this; |
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38 | clear(); |
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39 | copy(o); |
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40 | return *this; |
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41 | } |
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42 | |
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43 | stack& operator= (stack<T>&& o) { |
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44 | if ( this == &o ) return *this; |
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45 | head = o.head; |
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46 | o.head = nullptr; |
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47 | return *this; |
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48 | } |
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49 | |
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50 | bool empty() const { return head == nullptr; } |
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51 | |
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52 | void push(const T& value) { head = new node{ value, head }; /***/ } |
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53 | |
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54 | T pop() { |
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55 | node* n = head; |
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56 | head = n->next; |
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57 | T x = std::move(n->value); |
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58 | delete n; |
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59 | return x; |
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60 | } |
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61 | }; |
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