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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...r. This declaration as a whole means that Function1 is contravariant in P and covariant in R. Thus, we can derive the following axioms:
T1' <: T1
T2 <: T2'
---------------------------------------- S-Fun
Function1[T1, T2] <: Function1[T1', T2']
Notice that T1' must be a subtype (or the ...
Testing web application on Mac/Safari when I don't own a Mac
...ntly when a web site I launched displayed perfectly on IE, Firefox, Chrome and Safari on Windows but was corrupted when viewed using Safari on the Mac (by a potential customer), I need to start testing how my sites look when viewed on a Mac.
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Remove URL parameters without refreshing page
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TL;DR
1- To modify current URL and add / inject it (the new modified URL) as a new URL entry to history list, use pushState:
window.history.pushState({}, document.title, "/" + "my-new-url.html");
2- To replace current URL without adding it to history en...
Java equivalent to #region in C#
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There's no such standard equivalent. Some IDEs - Intellij, for instance, or Eclipse - can fold depending on the code types involved (constructors, imports etc.), but there's nothing quite like #region.
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How to create a directory and give permission in single command
How to create a directory and give permission in single command in Linux?
8 Answers
8
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How can I recover a lost commit in Git?
...reflog is your friend. Find the commit that you want to be on in that list and you can reset to it (for example:git reset --hard e870e41).
(If you didn't commit your changes... you might be in trouble - commit early, and commit often!)
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Is it possible to set a custom font for entire of application?
... same.
Is it possible to set this as default font, at application start up and then use it elsewhere in the application? When set, how do I use it in my layout XMLs?
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Convert a String representation of a Dictionary to a dictionary?
... literal structures: strings, numbers, tuples, lists, dicts, booleans,
and None.
For example:
>>> eval("shutil.rmtree('mongo')")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
File "/opt/Python...
Best way to initialize (empty) array in PHP
...o = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP?
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Why do we need argc while there is always a null at the end of argv?
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And argc could be quite big, because the shell is doing expansion (so in ls * the * is expanded by the shell before execve of /bin/ls executable). On my system, I can have an argc of several hundred thousands.
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