// Set error message from unified backend

std::string &global_error_string = get_global_error_string();

dim_t slen =

std::min(MAX_ERR_SIZE, static_cast<int>(global_error_string.size()));

// If this is true, the error is coming from the unified backend.

if (slen != 0) {

if (len && slen == 0) {

*len = 0;

*str = NULL;

return;

}

void *in = nullptr;

af_alloc_host(&in, sizeof(char) * (slen + 1));

memcpy(str, &in, sizeof(void *));

global_error_string.copy(*str, slen);

(*str)[slen] = '\0';

global_error_string = std::string("");

if (len) { *len = slen; }

} else {

// If false, the error is coming from active backend.

typedef void (*af_func)(char **, dim_t *);

void *vfn = LOAD_SYMBOL();

af_func func = nullptr;

memcpy(&func, &vfn, sizeof(void *));

func(str, len);

}