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What uses are there for “placement new”?
...ted buffer
string *p = new (buf) string("hi"); // placement new
string *q = new string("hi"); // ordinary heap allocation
You may also want to be sure there can be no allocation failure at a certain part of critical code (for instance, in code executed by a pacemaker). In that case you...
How to resolve “git did not exit cleanly (exit code 128)” error on TortoiseGit? [closed]
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git-bash reports
fatal: Unable to create <Path to git repo>/.git/index.lock: File exists.
Deleting index.lock makes the error go away.
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How to get the Android device's primary e-mail address
...tring possibleEmail = account.name;
...
}
}
Note that this requires the GET_ACCOUNTS permission:
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
More on using AccountManager can be found at the Contact Manager sample code in the SDK.
Method B: Use ContactsC...
Why should I prefer to use member initialization lists?
...ining to simple data structures (rather than complete classes). Read the FAQ for more: stackoverflow.com/questions/146452/what-are-pod-types-in-c
– monkey0506
Mar 28 '16 at 4:02
3
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How do I add a simple jQuery script to WordPress?
I read the Codex and a few blog posts about using jQuery in WordPress, and its very frustrating. I've got as far as loading jQuery in functions.php file, but all of the guides out there are crappy because they assume you already have a ton of WordPress experience. For instance, they say that now t...
Why are dates calculated from January 1st, 1970?
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using date(January 1st, 1970) as default standard
The Question makes two false assumptions:
All time-tracking in computing is done as a count-since-1970.
Such tracking is standard.
Two Dozen Epochs
Time in computing is not always tracked from the beginning of 1970 UTC. While t...
MySQL, better to insert NULL or empty string?
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If you are using multiple columns in a unique index and at least one of these columns are mandatory (i.e. a required form field), if you set the other columns in the index to NULL you may end up with duplicated rows. That's because NULL values are ignored in unique colum...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...ibrary. The key stepping stone is the use of shape types instead of simple index types, to address multidimensional indices (and even stencils).
The repa-io package includes support for reading and writing .bmp image files, though support for more formats is needed.
Addressing your specific questi...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...试具有响应能力的写入特征UUID。
CharacteristicByIndex – 从已连接设备支持的特征列表中返回指定索引的特征UUID，索引从 1 开始。
参数:
index (number) —
特征的索引，必须介于 1 和特征列表的长度之间...
How to convert a DOM node list to an array in Javascript?
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Using spread (ES2015), it's as easy as: [...document.querySelectorAll('p')]
(optional: use Babel to transpile the above ES6 code to ES5 syntax)
Try it in your browser's console and see the magic:
for( links of [...document.links] )
console.log(links);
...