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array_memory.h
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mazemake_tips.pdf
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mazesolve_tips.pdf
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/*
* Memory Helper Functions
*
* Description:
* Provides 4 functions for dynamically allocating multi-dimensional memory
* in C... 2D and 3D. This mimics C++ "templates" by allowing the user to
* pass in a type for each function. The following guarantees are made:
*
* - allocate_2d will return a 2D array of size (sx, sy)
* - allocate_3d will return a 3D array of size (sx, sy, sz)
* - Both allocate functions will return memory "zero'd out" (calloc).
* - free_2d and free_3d will free arrays if given the proper sizes.
*
* Author:
* Clara Nguyen
*/
#ifndef __CN_MEMORY__
#define __CN_MEMORY__
#include <stdlib.h>
/*
* allocate_2d
*
* Allocates a 2D array with all memory set to 0. It's a "define" because, in
* C, we can't use templates. So a "workaround" is to use macros to force a
* type as an argument (e.g. "type" here).
*
* void allocate_2d(type** var, type T, int sx, int sy);
*/
#define allocate_2d(var, type, sx, sy) { \
int _i; \
var = (type **) calloc(sx, sizeof(type *)); \
for (_i = 0; _i < sx; _i++) \
var[_i] = (type *) calloc(sy, sizeof(type)); \
}
/*
* allocate_3d
*
* Allocates a 3D array with all memory set to 0. It's a "define" because, in
* C, we can't use templates. So a "workaround" is to use macros to force a
* type as an argument (e.g. "type" here).
*
* void allocate_3d(type*** var, type T, int sx, int sy, int sz);
*/
#define allocate_3d(var, type, sx, sy, sz) { \
int _i, _j; \
var = (type ***) calloc(sx, sizeof(type **)); \
for (_i = 0; _i < sx; _i++) { \
var[_i] = (type **) calloc(sy, sizeof(type *)); \
for (_j = 0; _j < sy; _j++) \
var[_i][_j] = (type *) calloc(sz, sizeof(type)); \
} \
}
/*
* free_2d
*
* Frees a 2D array. It's a "define" because a custom type is used.
*
* void free_2d(type** var, type T, int sx, int sy);
*/
#define free_2d(var, type, sx, sy) { \
int _i; \
for (_i = 0; _i < sx; _i++) \
free(var[_i]); \
free(var); \
}
/*
* free_3d
*
* Frees a 3D array. It's a "define" because a custom type is used.
*
* void free_3d(type*** var, type T, int sx, int sy, int sz);
*/
#define free_3d(var, type, sx, sy, sz) { \
int _i, _j; \
for (_i = 0; _i < sx; _i++) { \
for (_j = 0; _j < sy; _j++) \
free(var[_i][_j]); \
free(var[_i]); \
} \
free(var); \
}
#endif