大约有 2,193 项符合查询结果（耗时：0.0122秒） [XML]
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...er than array doesn't reliably exhibit the problem, since the compiler can allocate the struct on an odd address so the x member is properly aligned. With an array of two struct foo objects, at least one or the other will have a misaligned x member.)
(In this case, p0 points to a misaligned addres...
urlencode vs rawurlencode?
...ster int x, y;
unsigned char *str;
str = (unsigned char *) safe_emalloc(3, len, 1);
for (x = 0, y = 0; len--; x++, y++) {
str[y] = (unsigned char) s[x];
#ifndef CHARSET_EBCDIC
if ((str[y] < '0' && str[y] != '-' && str[y] != '.') ||
(str[y] ...
Subtract 7 days from current date
...ate = [NSDate date];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setDay:-7];
NSDate *sevenDaysAgo = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents toDate:currentDate options:0];
NSLog(@"\ncurrentDate: %@\nseven days ago: %@", currentDate, ...
Set UIButton title UILabel font size programmatically
...he output in your xCode debugger.
Code:
NSArray *familyNames = [[NSArray alloc] initWithArray:[UIFont familyNames]];
NSArray *fontNames;
NSInteger indFamily, indFont;
for (indFamily=0; indFamily<[familyNames count]; ++indFamily)
{
NSLog(@"Family name: %@", [familyNames objectAtIndex:indFami...
Find lines from a file which are not present in another file [duplicate]
...
This allocated like 15GB of memory for me for a couple files each < 300 MB...
– user541686
Jan 13 '19 at 17:04
...
How is Node.js inherently faster when it still relies on Threads internally?
...ault stack sizes for modern threads tend to be pretty huge, but the memory allocated by a closure-based event system would be only what's needed)
b) a real benchmark that actually gives a fair chance to the threaded server of choice. At least that way, I'd have to stop believing that the claims are...
Iterator invalidation rules
...s
vector: The functions insert, emplace_back, emplace, push_back cause reallocation if the new size is greater than the old capacity. Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence. If no reallocation
happens, all the iterators and re...
How expensive is RTTI?
...;typeid()
5) 14,261,000 Ticks (~23 Seconds) - typeid() with extra variable allocations.
So the conclusion would be:
For simple cast cases without optimisation typeid() is more than twice faster than dyncamic_cast.
On a modern machine the difference between the two is about 1 nanosecond (a milliont...
What optimizations can GHC be expected to perform reliably?
...pose of floatInwards is floating into branches of a case, so that we don't allocate things, save them on the stack, and then discover that they aren't needed in the chosen branch.
As an example, suppose we had this expression:
let x = big in
case v of
True -> x + 1
False -&g...
Approximate cost to access various caches and main memory?
...s PINNED MEMORY for all CUDA Contexts, not just the one, current, when the allocation was performed
| ___HostAllocWriteCombined_MEM / cudaHostFree() +---------------- cudaHostRegisterMapped -- maps memory allocation into the CUD...