[3c2c2f0] | 1 | #include <assert.h> |
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| 2 | |
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| 3 | forall( tE & ) { |
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| 4 | |
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| 5 | struct dlink{ |
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| 6 | tE *next; |
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| 7 | tE *prev; |
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| 8 | }; |
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| 9 | |
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| 10 | static inline void ?{}( dlink(tE) & this ) { |
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| 11 | this.next = 0p; |
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| 12 | this.prev = 0p; |
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| 13 | } |
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| 14 | |
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| 15 | forall( tLinks & = dlink(tE) ) { |
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| 16 | struct dlist{ |
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| 17 | tE *first; |
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| 18 | tE *last; |
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| 19 | }; |
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| 20 | |
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| 21 | static inline void ?{}( dlist(tE, tLinks) & this ) { |
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| 22 | this.first = 0p; |
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| 23 | this.last = 0p; |
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| 24 | } |
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| 25 | } |
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| 26 | } |
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| 27 | |
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| 28 | trait embedded( tOuter &, tInner & ) { |
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| 29 | tInner & ?`inner( tOuter & ); |
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| 30 | }; |
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| 31 | |
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| 32 | // embedded is reflexive |
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| 33 | forall( tX & ) |
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| 34 | static inline tX & ?`inner( tX & this ) { return this; } |
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| 35 | |
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| 36 | // use this on every case of plan-9 inheritance, to make embedded a closure of plan-9 inheritance |
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| 37 | #define P9_EMBEDDED( tOuter, tInner ) \ |
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| 38 | static inline tInner & ?`inner( tOuter & this ) { return this; } |
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| 39 | |
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| 40 | |
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| 41 | forall( tE &, tLinks & | embedded( tE, tLinks ) | embedded( tLinks, dlink(tE) ) ) { |
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| 42 | static inline void insert_last( dlist(tE, tLinks) &lst, tE & e ) { |
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| 43 | if (lst.last) { |
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| 44 | verify(lst.first); |
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| 45 | dlink(tE) & oldLastLinks = (*lst.last)`inner`inner; |
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| 46 | verify(oldLastLinks.next == 0p); |
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| 47 | oldLastLinks.next = & e; |
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| 48 | } else { |
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| 49 | verify(!lst.first); |
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| 50 | lst.first = &e; |
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| 51 | } |
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| 52 | dlink(tE) & newLastLinks = e`inner`inner; |
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| 53 | verify(newLastLinks.prev == 0p); |
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| 54 | verify(newLastLinks.next == 0p); |
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| 55 | newLastLinks.prev = lst.last; |
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| 56 | lst.last = &e; |
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| 57 | } |
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| 58 | static inline void remove_first( dlist(tE, tLinks) &lst ) { |
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| 59 | verify(lst.first && lst.last); |
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| 60 | dlink(tE) & oldFirstLinks = (*lst.first)`inner`inner; |
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| 61 | verify(oldFirstLinks.prev == 0p); |
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| 62 | if( lst.last != lst.first) { |
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| 63 | verify(oldFirstLinks.next != 0p); |
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| 64 | tE & newFirst = * oldFirstLinks.next; |
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| 65 | dlink(tE) & newFirstLinks = (newFirst)`inner`inner; |
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| 66 | oldFirstLinks.next = 0p; |
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| 67 | newFirstLinks.prev = 0p; |
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| 68 | lst.first = & newFirst; |
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| 69 | } else { |
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| 70 | verify(oldFirstLinks.next == 0p); |
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| 71 | lst.last = 0p; |
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| 72 | lst.first = 0p; |
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| 73 | } |
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| 74 | } |
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| 75 | } |
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