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How to insert element as a first child?
... the problem with this solution is that it inserts as the first child and not before the list children, if the parent container contains different children elements and one wants to insert before a specific group of child nodes, this will not work.
– Aurovrata
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Why does volatile exist?
...s useless (The guy never sets the value! He's nuts, get rid of that code!) and my code would proceed without having acquired the semaphore, causing problems later on.
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How to supply value to an annotation from a Constant java
I am thinking this may not be possible in Java because annotation and its parameters are resolved at compile time. I have an interface as follows,
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Why is this program valid? I was trying to create a syntax error
... (Somehow I just managed to do such a bad commit.) So as a test program I randomly jotted this:
6 Answers
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How to switch to REPLACE mode in VIM
...eplace* *Replace-mode* *mode-replace*
Enter Replace mode with the "R" command in normal mode.
Of course you can map any key to R, for example by doing
:map <F5> R
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AttributeError: 'datetime' module has no attribute 'strptime'
...ould change the import statement to this:
from datetime import datetime
and access it as you are.
The people who made the datetime module also named their class datetime:
#module class method
datetime.datetime.strptime(date, "%Y-%m-%d")
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Can Python print a function definition?
...cts that are imported (not objects defined within the interactive prompt). And of course it will only work if Python can find the source code (so not on built-in objects, C libs, .pyc files, etc)
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How to change menu item text dynamically in Android
..., calling this from anywhere in your Activity,
invalidateOptionsMenu();
and then overriding:
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem item = menu.findItem(R.id.bedSwitch);
if (item.getTitle().equals("Set to 'In bed'")) {
item.setTitle("Set to 'Out of bed'...
How to use enums in C++
...== Days.Saturday)
Because Days is not a scope, nor object. It is a type. And Types themselves don't have members. What you wrote is the equivalent to std::string.clear. std::string is a type, so you can't use . on it. You use . on an instance of a class.
Unfortunately, enums are magical and so ...
Method call if not null in C#
...ke();
or:
obj?.SomeMethod();
The ?. is the null-propagating operator, and will cause the .Invoke() to be short-circuited when the operand is null. The operand is only accessed once, so there is no risk of the "value changes between check and invoke" problem.
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Prior to C# 6, no: there is no...