Last change
on this file since 97f9619 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:
885 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 | |
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4 | // code is nested in macros |
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5 | |
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6 | #define list(N) N ## _list |
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7 | |
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8 | #define list_insert(N) N ## _list_insert |
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9 | |
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10 | #define list_head(N) N ## _list_head |
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11 | |
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12 | #define define_list(N, T) \ |
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13 | struct list(N) { T value; struct list(N)* next; }; \ |
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14 | \ |
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15 | void list_insert(N)( struct list(N)** ls, T x ) { \ |
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16 | struct list(N)* node = malloc(sizeof(struct list(N))); \ |
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17 | node->value = x; node->next = *ls; \ |
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18 | *ls = node; \ |
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19 | } \ |
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20 | \ |
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21 | T list_head(N)( const struct list(N)* ls ) { return ls->value; } |
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22 | |
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23 | define_list(int, int); // defines int_list |
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24 | define_list(string, const char*); // defines string_list |
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25 | |
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26 | // use is efficient, but syntactically idiosyncratic |
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27 | |
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28 | int main() { |
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29 | struct list(int)* il = NULL; |
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30 | list_insert(int)( &il, 42 ); |
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31 | printf("%d\n", list_head(int)(il)); |
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32 | |
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33 | struct list(string)* sl = NULL; |
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34 | list_insert(string)( &sl, "hello" ); |
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35 | printf("%s\n", list_head(string)(sl)); |
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36 | } |
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