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What causes javac to issue the “uses unchecked or unsafe operations” warning
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This comes up in Java 5 and later if you're using collections without type specifiers (e.g., Arraylist() instead of ArrayList<String>()). It means that the compiler can't check that you're using the collection in a type-safe way, using generi...
Cross-browser window resize event - JavaScript / jQuery
... for tapping into the window resize event that works in Firefox, WebKit , and Internet Explorer?
11 Answers
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Getting the first index of an object
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As Ben Alpert points out, properties of Javascript objects are unordered, and your code is broken if you expect them to enumerate in the same order that they are specified in the object literal—there is no "first" property.
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C++ Exceptions questions on rethrow of original exception
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This question is rather old and has an answer appropriate to the time it was asked.
However, I just want to add a note on how to do proper exception handling since C++11 and I believe this corresponds very well to what you were trying to achieve with yo...
Chrome Extension Message passing: response not sent
I am trying to pass messages between content script and the extension
3 Answers
3
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CSS: transition opacity on mouse-out?
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You're applying transitions only to the :hover pseudo-class, and not to the element itself.
.item {
height:200px;
width:200px;
background:red;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-ms-transition: opacity 1s ease-in-out;
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How do I print a double value with full precision using cout?
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You can set the precision directly on std::cout and use the std::fixed format specifier.
double d = 3.14159265358979;
cout.precision(17);
cout << "Pi: " << fixed << d << endl;
You can #include <limits> to get the maximum precision of a floa...
MySQL error 2006: mysql server has gone away
I'm running a server at my office to process some files and report the results to a remote MySQL server.
28 Answers
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Using two CSS classes on one element [duplicate]
...l not matter so you can also reference it in css like so: .first.social {} and it will be the same as .social.first {}
– user1467439
Apr 3 '16 at 21:18
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django urls without a trailing slash do not redirect
...True, if the request URL does not match any of the patterns in the URLconf and it doesn’t end in a slash, an HTTP redirect is issued to the same URL with a slash appended. Note that the redirect may cause any data submitted in a POST request to be lost.". "The APPEND_SLASH setting is only used i...