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我目前正試圖瞭解動態內存分配如何工作。 我有這樣的代碼:收縮矩陣與realloc
int main()
{
int **mat, i;
mat = calloc(3, sizeof(int*));
for(i = 0; i < 3; i++)
mat[i] = calloc(3, sizeof(int));
mat = realloc(mat, 1*sizeof(int*));
for(i = 0; i < 1; i++)
mat[i] = realloc(mat[i], 1*sizeof(int));
for(i = 0; i < 1; i++)
free(mat[i]);
free(mat);
return 0;
}
我與Valgrind的檢查內存泄漏:
24 bytes in 2 blocks are definitely lost in loss record 1 of 1
at 0x4C2C975: calloc (vg_replace_malloc.c:711)
by 0x400605: main (main.c:10)
LEAK SUMMARY:
definitely lost: 24 bytes in 2 blocks
indirectly lost: 0 bytes in 0 blocks
possibly lost: 0 bytes in 0 blocks
still reachable: 0 bytes in 0 blocks
suppressed: 0 bytes in 0 blocks
如果我重新分配到n *的sizeof(INT),其中n> 1所述的泄漏不會發生。 這是怎麼回事?
當你減少'mat'數組的大小時,你已經丟失了一些'mat [i]'指針。即'mat [1]'和'mat [2]'。 – kaylum