Last change
on this file since 2f4c910 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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1 | #include "cpp-vstack.hpp" |
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2 | #include <utility> |
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3 | |
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4 | stack::node::node( const object& v, node* n ) : value( v.new_copy() ), next( n ) {} |
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5 | |
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6 | void stack::copy(const stack& o) { |
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7 | node** crnt = &head; |
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8 | for ( node* next = o.head; next; next = next->next ) { |
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9 | *crnt = new node{ *next->value }; |
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10 | crnt = &(*crnt)->next; |
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11 | } |
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12 | *crnt = nullptr; |
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13 | } |
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14 | |
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15 | stack::stack() : head(nullptr) {} |
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16 | stack::stack(const stack& o) { copy(o); } |
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17 | stack::stack(stack&& o) : head(o.head) { o.head = nullptr; } |
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18 | stack::~stack() { clear(); } |
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19 | |
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20 | stack& stack::operator= (const stack& o) { |
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21 | if ( this == &o ) return *this; |
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22 | clear(); |
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23 | copy(o); |
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24 | return *this; |
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25 | } |
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26 | |
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27 | stack& stack::operator= (stack&& o) { |
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28 | if ( this == &o ) return *this; |
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29 | head = o.head; |
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30 | o.head = nullptr; |
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31 | return *this; |
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32 | } |
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33 | |
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34 | void stack::clear() { |
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35 | for ( node* next = head; next; ) { |
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36 | node* crnt = next; |
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37 | next = crnt->next; |
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38 | delete crnt; |
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39 | } |
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40 | head = nullptr; |
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41 | } |
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42 | |
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43 | |
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44 | bool stack::empty() const { return head == nullptr; } |
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45 | |
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46 | void stack::push(const object& value) { head = new node{ value, head }; /***/ } |
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47 | |
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48 | ptr<object> stack::pop() { |
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49 | node* n = head; |
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50 | head = n->next; |
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51 | ptr<object> x = std::move(n->value); |
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52 | delete n; |
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53 | return x; |
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54 | } |
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