自学教程：C++ ARRLEN函数代码示例

bool MapDatabasePostgreSQL::saveBlock(const v3s16 &pos, const std::string &data){	// Verify if we don't overflow the platform integer with the mapblock size	if (data.size() > INT_MAX) {		errorstream << "Database_PostgreSQL::saveBlock: Data truncation! "			<< "data.size() over 0xFFFFFFFF (== " << data.size()			<< ")" << std::endl;		return false;	}	verifyDatabase();	s32 x, y, z;	x = htonl(pos.X);	y = htonl(pos.Y);	z = htonl(pos.Z);	const void *args[] = { &x, &y, &z, data.c_str() };	const int argLen[] = {		sizeof(x), sizeof(y), sizeof(z), (int)data.size()	};	const int argFmt[] = { 1, 1, 1, 1 };	if (getPGVersion() < 90500) {		execPrepared("write_block_update", ARRLEN(args), args, argLen, argFmt);		execPrepared("write_block_insert", ARRLEN(args), args, argLen, argFmt);	} else {		execPrepared("write_block", ARRLEN(args), args, argLen, argFmt);	}	return true;}

static void test(struct socket_server *ss) {	pthread_t pid;	pthread_create(&pid, NULL, _poll, ss);	int i = 0;	int connid = socket_server_connect(ss, 400, "127.0.0.1", 8888);		getc(stdin);	socket_server_start(ss, 401, connid);	char* tmp[3] = { "hello", "world", "wong" };	int cnt = ARRLEN(tmp);		char* contents[ARRLEN(tmp)];	for (i = 0; i < cnt; ++i)	{		contents[i] = malloc(strlen(tmp[i]) + 1); 		memcpy(contents[i], tmp[i], strlen(tmp[i]));	}		for (i = 0; i < cnt; ++i)	{		socket_server_send(ss, connid, contents[i], strlen(contents[i]));		getc(stdin);	}	printf("done/n");	pthread_join(pid, NULL);}

int updateMemory(void){#define ARRLEN(X) (sizeof(X) / sizeof(X[0]))    long pagesize; /* using a long promotes the arithmetic */    size_t len;    {        static int mib[] = {CTL_HW, HW_PHYSMEM};        len = sizeof(Total);        sysctl(mib, ARRLEN(mib), &Total, &len, NULL, 0);        Total >>= 10;    }    {        struct uvmexp x;        static int mib[] = {CTL_VM, VM_UVMEXP};        len = sizeof(x);        STotal = SUsed = SFree = -1;        pagesize = 1;        if(-1 < sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0))        {            pagesize = x.pagesize;            STotal = (pagesize * x.swpages) >> 10;            SUsed = (pagesize * x.swpginuse) >> 10;            SFree = STotal - SUsed;        }    }

void test_nghttp2_hd_deflate_bound(void) {  nghttp2_hd_deflater deflater;  nghttp2_nv nva[] = {MAKE_NV(":method", "GET"), MAKE_NV("alpha", "bravo")};  nghttp2_bufs bufs;  size_t bound, bound2;  nghttp2_mem *mem;  mem = nghttp2_mem_default();  frame_pack_bufs_init(&bufs);  nghttp2_hd_deflate_init(&deflater, mem);  bound = nghttp2_hd_deflate_bound(&deflater, nva, ARRLEN(nva));  CU_ASSERT(12 + 6 * 2 * 2 + nva[0].namelen + nva[0].valuelen + nva[1].namelen +                nva[1].valuelen ==            bound);  nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, ARRLEN(nva));  CU_ASSERT(bound > (size_t)nghttp2_bufs_len(&bufs));  bound2 = nghttp2_hd_deflate_bound(&deflater, nva, ARRLEN(nva));  CU_ASSERT(bound == bound2);  nghttp2_bufs_free(&bufs);  nghttp2_hd_deflate_free(&deflater);}

int main(void){	int A[] = {6, 2, 4, 3, 5, 1}; 	int i = 0;		clock_t begin, end;		printf("Tal f
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