Last change
on this file since c015e2d was
48b7085e,
checked in by Aaron Moss <a3moss@…>, 6 years ago
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Start into generic types design in thesis
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Property mode set to
100644
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File size:
878 bytes
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Line | |
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1 | #include <stdlib.h> |
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2 | #include <stdio.h> |
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3 | #include <string.h> |
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4 | |
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5 | // single code implementation |
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6 | |
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7 | struct list { void* value; struct list* next; }; |
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8 | |
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9 | // internal memory management requires helper functions |
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10 | |
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11 | void list_insert( struct list** ls, void* x, void* (*copy)(void*) ) { |
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12 | struct list* node = malloc(sizeof(struct list)); |
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13 | node->value = copy(x); node->next = *ls; |
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14 | *ls = node; |
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15 | } |
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16 | |
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17 | void* list_head( const struct list* ls ) { return ls->value; } |
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18 | |
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19 | // helpers duplicated per type |
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20 | |
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21 | void* int_copy(void* x) { |
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22 | int* n = malloc(sizeof(int)); |
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23 | *n = *(int*)x; |
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24 | return n; |
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25 | } |
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26 | |
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27 | void* string_copy(void* x) { return strdup((const char*)x); } |
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28 | |
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29 | int main() { |
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30 | struct list* il = NULL; |
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31 | int i = 42; |
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32 | list_insert( &il, &i, int_copy ); |
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33 | printf("%d\n", *(int*)list_head(il)); // unsafe type cast |
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34 | |
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35 | struct list* sl = NULL; |
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36 | list_insert( &sl, "hello", string_copy ); |
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37 | printf("%s\n", (char*)list_head(sl)); |
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38 | } |
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