大约有 40,000 项符合查询结果（耗时：0.0288秒） [XML]
Advantage of switch over if-else statement
...
This immediate-constant bitmap is a big win, because there's no cache miss on the bitmap. It works if the "special" error codes are all in a range 64 or less. (or 32 for legacy 32bit code.) The compiler subtracts the smallest case value, if it's non-zero. The t...
Advantages of std::for_each over for loop
..., replace, etc and these won't look so strange anymore. This can be a huge win.
Update 1:
Most importantly, it helps you go beyond for_each vs. for-loops like that's all there is, and look at the other STL-alogs, like find / sort / partition / copy_replace_if, parallel execution .. or whatever.
A ...
How to convert An NSInteger to an int?
...stem.
#if __LP64__ || TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64
typedef long NSInteger;
#else
typedef int NSInteger;
#endif
You can use NSInteger any place you use an int without converting it.
...
What is the difference between memmove and memcpy?
...than memcpy and if you are unlucky, it may even be slower, so you can only win calling memcpy.
share
|
improve this answer
|
follow
|
...
Hashset vs Treeset
...tation of bubble sort (O(N^2) avg/worst) for 10 elements. Bubble sort will win every time. The point is algorithms classes teach everyone to think about approximations using time-complexity but in the real world the constant factors MATTER frequently.
– Peter Oehlert
...
.NET - Dictionary locking vs. ConcurrentDictionary
... Or, what if two customers reaches for the same item at the same time, who wins? Will there be a fight? This is a non-threadsafe-collection. There's plenty of ways to avoid problems, but they all require some kind of locking, or rather explicit access in some way or another.
On the other hand, cons...
How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]
...ins the info you need in the Machine member which contains one of the following values
IMAGE_FILE_MACHINE_I386 (0x014c)
IMAGE_FILE_MACHINE_IA64 (0x0200)
IMAGE_FILE_MACHINE_AMD64 (0x8664)
This information should be at a fixed offset in the file, but I'd still recommend traversing the file and che...
Python __call__ special method practical example
...
@delnan: This is not intended to be shortest. No one wins at code golf. It's intended to show __call__, be simple and nothing more.
– S.Lott
Apr 28 '11 at 21:06
...
Apache Prefork vs Worker MPM
... system unless a different one is choosen at compile-time (for instance on Windows mpm_winnt is used by default). Here's the list of operating systems and their default MPMs:
BeOS beos
Netware mpm_netware
OS/2 mpmt_os2
Unix/Linux prefork (update for Apache version ≥ 2.4: prefork, worker, or...
WAMP/XAMPP is responding very slow over localhost
...
I had the same problem running on Windows 8 running on 64bit. Apache is really slow but when you press F5 many times it goes ok. In the end i after doing many things managed to solve it. Right now it works fast.
Try the following tasks to increase the perfo...