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C++虚继承的概念 - C/C++ - 清泛网 - 专注C/C++及内核技术
... Child c;
40:
41: //不能这样使用，会产生二意性，VC下error C2385
42: //c.print();
43:
44: //只能这样使用
45: c.Base::print();
46: c.Sub::print();
47:
48: system("pause");
49: return 0;
50: }
◇多重继承：
1: //----...
In plain English, what does “git reset” do?
...ert is a command to "fix-commited mistake".
It means if we have made some error in some change and commited and pushed the same to git repo, then git revert is the solution. And if in case we have identified the same error before pushing/commiting, we can use git reset to fix the issue.
I hope it...
Find the similarity metric between two strings
...r, AKA read the docs! In my particular application I was doing some basic error checking / reporting to the user providing bad input, and this answer allows me to report to them the potential matches and what the "similarity" was. If you don't need to display the similarity, though, definitely che...
How do I save a UIImage to a file?
...?.write(to: filePath, options: .atomic)
} catch {
// Handle the error
}
}
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How can I use a search engine to search for special characters? [closed]
...s, such as finding out what the variable "$-" is in perl, or searching for error output that is loaded with special characters.
...
MySQL: determine which database is selected?
...ysql_current_db() {
$r = mysql_query("SELECT DATABASE()") or die(mysql_error());
return mysql_result($r,0);
}
?>
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How to check if function exists in JavaScript?
... && typeof obj === 'function') { ... }
kept throwing a reference error if obj happened to be undefined.
In the end I did the following:
if (typeof obj !== 'undefined' && typeof obj === 'function') { ... }
A colleague pointed out to me that checking if it's !== 'undefined' and t...
Increment value in mysql update query
... $bdd->query('SET NAMES "utf8"');
} catch (PDOException $e) {
exit('Error');
}
No need to query DB to get the number of points. You can increment directly in the update query (points = points + 1).
(note : Also, it’s not a good idea to increment the value with PHP because you need to sel...
Get individual query parameters from Uri [duplicate]
...sing this in a controlled setting, where encoding issues would be a coding error on the server side that should be fixed.
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Prevent Default on Form Submit jQuery
...not work if jQuery can't get the form element, and jQuery doesn't give any error about that. If your script is placed in the head of the document, make sure the code runs after DOM is ready. So, $(document).ready(function () { // your code here // }); will solve the problem.
The best practice is, a...