大约有 4,200 项符合查询结果（耗时：0.0269秒） [XML]
When to use Task.Delay, when to use Thread.Sleep?
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'await Task.Delay()' frees the thread to do other things until the timer expires, 100% clear. But what if I cannot use 'await' since the method is not prefixed with 'async'? Then I can only call 'Task.Delay()'. In that case the thread is still bl...
What is the fastest way to compute sin and cos together?
...e-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5488)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ cat main.c
#include <math.h>
str...
Get records with max value for each group of grouped SQL results
... it works but it is not guaranteed. The documentation says: "The server is free to choose any value from each group, so unless they are the same, the values chosen are indeterminate.". The server doesn't select rows but values (not necessarily from the same row) for each column or expression that ap...
Is there a read-only generic dictionary available in .NET?
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Feel free to use my simple wrapper. It does NOT implement IDictionary, so it doesn't have to throw exceptions at runtime for dictionary methods that would change the dictionary. Change methods simply aren't there. I made my own in...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...略和使用条款 关注公众号，精彩不错过！ #free_v { border:none; position:fixed; top:40%; left:5px; width:200px; height:500px; display: none;}@media screen and (max-width: 700px) { #free_v { top:200%; }}
Need to handle uncaught exception and send log file
...eprting tools that do this easily.
crashlytics - A crash reporting tool, free of charge but gives you basic reports
Advantages : Free
Gryphonet - A more advanced reporting tool, requires some kind of fee.
Advantages : Easy recreation of crashes, ANR's, slowness...
If you are a private developer ...
SAML vs federated login with OAuth
...treme example, but bear with me). After buying a flight, they will offer a free rental car to its Chairman members. US Airways and Hertz would setup some form of trust, and some way to identify the user. In our case our "federated id" would be the email address, and it would be a one way set of tru...
What is the optimal algorithm for the game 2048?
...nshot of a perfectly smooth grid, courtesy of this excellent parody fork.
Free Tiles
And finally, there is a penalty for having too few free tiles, since options can quickly run out when the game board gets too cramped.
And that's it! Searching through the game space while optimizing these criteria...
How to shrink/purge ibdata1 file in MySQL
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When you delete innodb tables, MySQL does not free the space inside the ibdata file, that's why it keeps growing. These files hardly ever shrink.
How to shrink an existing ibdata file:
https://dev.mysql.com/doc/refman/5.6/en/innodb-system-tablespace.html#innodb-resize-sy...
Difference between string and char[] types in C++
...so release its heap memory on the calling heap, so it will only be able to free memory again if you're using a shared (.dll or .so) version of the runtime.
In short: use C++ strings in all your internal functions and methods. If you ever write a .dll or .so, use C strings in your public (dll/so-exp...