source:
doc/theses/rob_schluntz_MMath/examples/ctor/placement_ctor.c
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e056330
Last change on this file since e056330 was 67982887, checked in by , 6 years ago | |
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1 | struct memory_pool { |
2 | char * start; |
3 | char * cur; |
4 | size_t size; |
5 | char * free; |
6 | }; |
7 | |
8 | void ?{}(memory_pool * pool, size_t size) { |
9 | pool->[start, cur] = malloc(size); |
10 | pool->size = size; |
11 | printf("initializing memory pool with size %lu at location %p\n", pool->size, pool->start); |
12 | } |
13 | |
14 | void ^?{}(memory_pool * pool) { |
15 | free(pool->start); |
16 | } |
17 | |
18 | forall(dtype T | sized(T)) |
19 | T * allocate(memory_pool * pool, unsigned int array_size = 1) { |
20 | size_t size = sizeof(T) * array_size; |
21 | printf("allocating block of size %lu...", size); |
22 | if (pool->cur + size < pool->start + pool->size) { |
23 | T * x = (T*)pool->cur; |
24 | pool->cur += size; |
25 | printf("success!\n"); |
26 | printf("next address is %p\n", pool->cur); |
27 | return x; |
28 | } else { |
29 | printf("failed!\n"); |
30 | // fail to allocate |
31 | return 0; |
32 | } |
33 | } |
34 | |
35 | struct A { |
36 | int x, y, z; |
37 | }; |
38 | void ?{}(A * a) { |
39 | a->[x,y,z] = [123, 456, 789]; |
40 | } |
41 | |
42 | int main() { |
43 | memory_pool pool = { 1024 }; |
44 | |
45 | int * x = allocate(&pool); |
46 | A * a = allocate(&pool); |
47 | A * b = allocate(&pool, 1000); |
48 | a{}; |
49 | printf("%p\n", x); |
50 | printf("%p %d %d %d\n", a, a->[x,y,z]); |
51 | } |
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