Waste memory

[oneonce]

typedef struct cJSON {
struct cJSON *next, *prev;
struct cJSON *child;
int type;
char *valuestring;
int valueint;
double valuedouble;
char *string;
} cJSON;

size_t size = sizeof(cJSON) = 40

typedef struct cJSON {
struct cJSON *next, *prev;
struct cJSON *child;
int type;
char *string;
union Value
{
char *valuestring;
//int valueint; // can not save 0xFFFF FFFF FFFF FFFF
int64_t valuelong; // can save 0xFFFF FFFF FFFF FFFF
double valuedouble;
} value;
} cJSON;

size_t size = sizeof(cJSON) = 32

when we use cJSON for embedded device(such as: ARM Cortex M3/M4/M7), the memory is very small.

[Alanscut]

cJSON has plans to use union in the future(milestone 2.0.0), for details, please see #63. But int64_t is incompatible with c89, it may not be acceptable in the short term.

[DBJDBJ]

https://github.com/zserge/jsmn