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How do I run Asynchronous callbacks in Playground
Many Cocoa and CocoaTouch methods have completion callbacks implemented as blocks in Objective-C and Closures in Swift. However, when trying these out in Playground, the completion is never called. For example:
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How to clear APC cache entries?
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You can use the PHP function apc_clear_cache.
Calling apc_clear_cache() will clear the system cache and calling apc_clear_cache('user') will clear the user cache.
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Unnecessary curly braces in C++?
... it can also be handy to have resources (files, mutexes, whatever) automatically released as the scope exits, which can make things cleaner. This means you can hold on to some shared resource for a shorter duration than you would if you grabbed it at the start of the method.
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PostgreSQL: Drop PostgreSQL database through command line [closed]
...of activity is currently taking place against your database, including all idle processes.
SELECT * FROM pg_stat_activity WHERE datname='database name';
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Express.js req.body undefined
...use(app.router). In fact, app.use(app.router) should be the last thing you call.
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How do I get class name in PHP?
...e. I found this out by trying to access the ::class property(?) of a dynamically generated class and getting the following error: Dynamic class names are not allowed in compile-time ::class fetch. See this answer for more details. I also found this note from the docs helpful.
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Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...于是又添加了如下的代码：
_gaq.push(
["_addOrganic", "baidu", "word"],
["_addOrganic", "so.360.cn", "q"],
["_addOrganic", "sogou", "query"],
["_addOrganic", "soso", "w"],
["_addOrganic", "gougou", "search"],
["_addOrganic", "youdao", "q"]
);
随着对业务分析的深...
What is the Sign Off feature in Git for?
...t, especially with patches.” — That’s almost certainly wrong (specifically the first sentence). As a counter-example, see for example b2c150d3aa (linked to in VonC’s answer), which has two signed-off-by headers; one by the author, and one by the maintainer. This is common practice in the Gi...
getApplication() vs. getApplicationContext()
...ant the Application class you registered in the Manifest, you should never call getApplicationContext() and cast it to your application, because it may not be the application instance (which you obviously experienced with the test framework).
Why does getApplicationContext() exist in the first plac...
How to pass command line argument to gnuplot?
...ird argument : ", THIRD
print "number of arguments: ", ARGC
can be called as:
$ gnuplot -c script.gp one two three four five
script name : script.gp
first argument : one
third argument : three
number of arguments: 5
or within gnuplot as
gnuplot> call 'script.gp' one two...