大约有 40,000 项符合查询结果（耗时：0.0338秒） [XML]
Should a return statement be inside or outside a lock?
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Essentially, which-ever makes the code simpler. Single point of exit is a nice ideal, but I wouldn't bend the code out of shape just to achieve it... And if the alternative is declaring a local variable (outside the lock), initializing it (inside the lock) and then returning it (outside...
Efficient evaluation of a function at every cell of a NumPy array
...t be faster than the "manual" double loop iteration and assignment through all the array elements. Especially, because it stores the result to a newly created variable (and not directly to the initial input). Thanks a lot for your reply though:)
– Peter
Oct 9 '...
How to write very long string that conforms with PEP8 and prevent E501
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Implicit concatenation might be the cleanest solution:
s = "this is my really, really, really, really, really, really," \
" really long string that I'd like to shorten."
Edit On reflection I agree that Todd's suggestion to use brackets rather than line continuation is better for all the reas...
Dashed line border around UIView
...t@2x.png and test@3x.png with size of 240x240 and 360x360 which is used in all the apple device automatically with it's related name. (i.e. test.png is use in iPhone 4, test@2x will useful for iPhone 4s, 5, 5s, 6, 6s and twst@3x will useful for iPhone 6 plus, 6s plus.
– Paras J...
Is there any way to kill a Thread?
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It is generally a bad pattern to kill a thread abruptly, in Python and in any language. Think of the following cases:
the thread is holding a critical resource that must be closed properly
the thread has created several other threads ...
How does type Dynamic work and how to use it?
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Scalas type Dynamic allows you to call methods on objects that don't exist or in other words it is a replica of "method missing" in dynamic languages.
It is correct, scala.Dynamic doesn't have any members, it is just a marker interface - the co...
C++简练易用的线程池(threadpool)及上下文隔离的无锁线程池(isolated_threa...
... bind： .commit(std::bind(&Dog::sayHello, &dog));
// 一种是用 mem_fn： .commit(std::mem_fn(&Dog::sayHello), this)
template<class F, class... Args>
auto commit(F&& f, Args&&... args) ->future<decltype(f(args...))>
{
if (!_run)
throw runtime_error("commit on ThreadPool is stopped.")...
【解决】bufferevent_openssl.c:228:19: error: storage size of \'methods...
...target 'bufferevent_openssl.lo' failed
原因：
系统openssl的安装版本是1.1.0+，而xunsearch安装包里的libevent 2.0.x需要openssl < 1.1.0，导致不兼容报错。
常用的几个Linux发行版已经把系统的openssl升级到了1.1.0+，即对应需要libevent 2.1.x+，而lib...
Bash: Copy named files recursively, preserving folder structure
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Have you tried using the --parents option? I don't know if OS X supports that, but that works on Linux.
cp --parents src/prog.js images/icon.jpg /tmp/package
If that doesn't work on OS X, try
rsync -R src/prog.js images/icon.jpg /tmp/package
as aif suggested.
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Error handling in C code
... your library as painless as possible think about these additions:
store all possible error-states in one typedef'ed enum and use it in your lib. Don't just return ints or even worse, mix ints or different enumerations with return-codes.
provide a function that converts errors into something huma...