大约有 44,000 项符合查询结果（耗时：0.0541秒） [XML]
Why do I need to override the equals and hashCode methods in Java?
Recently I read through this
Developer Works Document .
29 Answers
29
...
Expand Python Search Path to Other Source
...
You should also read about python packages here: http://docs.python.org/tutorial/modules.html.
From your example, I would guess that you really have a package at ~/codez/project. The file __init__.py in a python directory maps a directory ...
Always pass weak reference of self into block in ARC?
...located properly.
Because, in a situation like this, self by definition already has a strong reference to the block, it's usually easiest to resolve by making an explicitly weak reference to self for the block to use:
__weak MyObject *weakSelf = self;
[self setMyBlock:^(id obj, NSUInteger idx, BOO...
Fixed point vs Floating point number
...ust can't understand fixed point and floating point numbers due to hard to read definitions about them all over Google. But none that I have read provide a simple enough explanation of what they really are. Can I get a plain definition with example?
...
Does Java SE 8 have Pairs or Tuples?
... in Java SE was proposed and rejected at least once. See this discussion thread on one of the OpenJDK mailing lists. The tradeoffs are not obvious. On the one hand, there are many Pair implementations in other libraries and in application code. That demonstrates a need, and adding such a class to Ja...
How to prevent Browser cache for php site
..., I can highly recommend grabbing a copy of HTTP: The Definitive Guide and reading the chapter on Caching. Also the RFCs, but reading those is a distinct skill. ("Connection: close" is a hilarious foot-shot to include, disabling efficient pipelining of requests, or will do nothing, but I suspect PHP...
How do CUDA blocks/warps/threads map onto CUDA cores?
...a few weeks, but I have some doubts about the allocation of blocks/warps/thread.
I am studying the architecture from a didactic point of view (university project), so reaching peak performance is not my concern.
...
Why is creating a new process more expensive on Windows than Linux?
...mportant role on NT than on Unix as NT, in contrast to Unix, favors multithreading over multiprocessing.
Rob, it is true that fork is relatively cheap when COW is used, but as a matter of fact, fork is mostly followed by an exec. And an exec has to load all images as well. Discussing the performanc...
Java generics type erasure: when and what happens?
I read about Java's type erasure on Oracle's website .
7 Answers
7
...
Why no love for SQL? [closed]
...ou wouldn't have to care about performance. So you end up in writing SQL - reading execution plans - rephrasing SQL trying to influence the execution plan, and you wonder why you can't write the execution plan yourself.
Another problem of the declarative language is that some problems are easier to...