动态矩阵

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>

//为动态矩阵分配内存空间
void** dmatrix_new(int row, int col, int type_size)
{
    void** arr;
    void* headp;

    arr = (void**) malloc( sizeof(void*) * row

+ row*col*type_size );
    if (arr == NULL)
        exit(1);

    headp = (void*)arr + sizeof(void*) * row;
    memset(arr, 0, sizeof(void*) * row + row*col*type_size);
    while (row--)
        arr[row] = headp + row*col*type_size;

    return arr;
}

//释放动态矩阵的内存
void dmatrix_delete(void** arr)
{
    if (arr != NULL)
        free(arr);
}


//测试
int main()
{
    int i, j;
    int row = 2, col = 5;
    int** p = (int**)dmatrix_new(row, col, sizeof(int));
    p[0][1]=10;
    p[1][4]=5;
    for (i=0; i<2; ++i)
        for (j=0; j<5; ++j)
            printf("%d\n", p[i][j]);
    dmatrix_delete( (void**)p );
    return 0;
}