new-envwith_gc
Last change
on this file since 9f2012f was
860f19f,
checked in by Aaron Moss <a3moss@…>, 7 years ago
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Clean up code edits
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-
Property mode set to
100644
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File size:
1004 bytes
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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> struct 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 | node( const T & v, node * n = nullptr ) : value( v ), next( n ) {} |
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9 | }; |
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10 | node * head; |
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11 | |
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12 | stack() : head( nullptr ) {} |
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13 | stack( const stack<T> & o ) { copy( o ); } |
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14 | |
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15 | void clear() { |
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16 | for ( node * next = head; next; ) { |
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17 | node * crnt = next; |
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18 | next = crnt->next; |
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19 | delete crnt; |
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20 | } |
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21 | head = nullptr; |
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22 | } |
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23 | |
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24 | void copy( const stack<T> & o ) { |
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25 | node ** crnt = &head; |
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26 | for ( node * next = o.head; next; next = next->next ) { |
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27 | *crnt = new node{ next->value }; /***/ |
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28 | crnt = &(*crnt)->next; |
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29 | } |
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30 | *crnt = nullptr; |
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31 | } |
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32 | |
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33 | ~stack() { clear(); } |
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34 | |
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35 | stack & operator= ( const stack<T> & o ) { |
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36 | if ( this == &o ) return *this; |
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37 | clear(); |
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38 | copy( o ); |
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39 | return *this; |
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40 | } |
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41 | |
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42 | bool empty() const { return head == nullptr; } |
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43 | |
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44 | void push( const T & value ) { head = new node{ value, head }; /***/ } |
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45 | |
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46 | T pop() { |
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47 | node * n = head; |
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48 | head = n->next; |
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49 | T v = std::move( n->value ); |
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50 | delete n; |
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51 | return v; |
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52 | } |
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53 | }; |
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