在中动态分配二维数组物业

规定过于原则和宽泛。 #include iostream

#include cstdlib

#include new

template typename T

T **darray_new(int row, int col)

{

int size = sizeof(T);

void **arr = (void **) malloc(sizeof(void *) * row + size * row * col);

if (arr != NULL)

{

unsigned char * head;

head = (unsigned char *) arr + sizeof(void *) * row;

for (int i = 0; i row; ++i)

{

arr[i] = head + size * i * col;

for (int j = 0; j col; ++j)

new (head + size * (i * col + j)) T;

}

}

return (T**) arr;

}

template typename T

void darray_free(T **arr, int row, int col)

{

for (int i = 0; i row; ++i)

for (int j = 0; j col; ++j)

arr[i][j].~T();

if (arr != NULL)

free((void **)arr);

}

实践中考虑用boost::multi_array之类的现成的解决方案可能会更有效。

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