ADTast-experimentalenumforall-pointer-decaypthread-emulationqualifiedEnum
Last change
on this file since bc4a433 was
4c80a75,
checked in by Peter A. Buhr <pabuhr@…>, 6 years ago
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update evaluation programs
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-
Property mode set to
100644
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File size:
947 bytes
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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 ** cr = &head; |
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8 | for ( node * nx = o.head; nx; nx = nx->next ) { |
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9 | *cr = new node{ *nx->value }; /***/ |
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10 | cr = &(*cr)->next; |
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11 | } |
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12 | *cr = nullptr; |
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13 | } |
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14 | |
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15 | void stack::clear() { |
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16 | for ( node * nx = head; nx; ) { |
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17 | node * cr = nx; |
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18 | nx = cr->next; |
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19 | delete cr; |
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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 | stack::stack() : head( nullptr ) {} |
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25 | stack::stack( const stack & o ) { copy( o ); } |
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26 | stack::~stack() { clear(); } |
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27 | |
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28 | stack & stack::operator=( const stack & o ) { |
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29 | if ( this == &o ) return *this; |
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30 | clear(); |
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31 | copy( o ); |
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32 | return *this; |
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33 | } |
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34 | |
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35 | bool stack::empty() const { |
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36 | return head == nullptr; |
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37 | } |
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38 | |
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39 | void stack::push( const object & value ) { |
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40 | head = new node{ value, head }; /***/ |
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41 | } |
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42 | |
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43 | ptr<object> stack::pop() { |
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44 | node * n = head; |
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45 | head = n->next; |
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46 | ptr<object> v = std::move( n->value ); |
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47 | delete n; |
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48 | return v; |
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49 | } |
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