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Can a class member function template be virtual?
...ne and the compiler cannot generate the appropriate instance anymore. Therefore you cannot have virtual member function templates.
However, there are a few powerful and interesting techniques stemming from combining polymorphism and templates, notably so-called type erasure.
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How do Trigonometric functions work?
...re periodic, so you need to reduce arguments down to a standard interval. For starters, you could reduce angles to be between 0 and 360 degrees. But by using a few identities, you realize you could get by with less. If you calculate sines and cosines for angles between 0 and 45 degrees, you can bo...
Best practices for overriding isEqual: and hash
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Start with
NSUInteger prime = 31;
NSUInteger result = 1;
Then for every primitive you do
result = prime * result + var
For objects you use 0 for nil and otherwise their hashcode.
result = prime * result + [var hash];
For booleans you use two different values
result = prime * r...
What exactly is a Maven Snapshot and why do we need it?
...ot version in Maven is one that has not been released.
The idea is that before a 1.0 release (or any other release) is done, there exists a 1.0-SNAPSHOT. That version is what might become 1.0. It's basically "1.0 under development". This might be close to a real 1.0 release, or pretty far (right af...
How to use git bisect?
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The idea behind git bisect is to perform a binary search in the history to find a particular regression. Imagine that you have the following development history:
... --- 0 --- 1 --- 2 --- 3 --- 4* --- 5 --- current
You know that your program is not working p...
Remove data.frame row names when using xtable
...'s quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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Understanding :source option of has_one/has_many through of Rails
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Sometimes, you want to use different names for different associations. If the name you want to use for an association on the model isn't the same as the assocation on the :through model, you can use :source to specify it.
I don't think the above paragraph is much cle...
XAMPP - Port 80 in use by “Unable to open process” with PID 4! 12
I have been trying to figure out how to fix this problem for two days. I'm new to this kind of thing so I would appreciate it if someone could tell me how to fix it.
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What is the difference between shallow copy, deepcopy and normal assignment operation?
...pies:
The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
class instances):
A shallow copy constructs a new compound object and then (to the extent possible) inserts references into it to the obje...
Android TextView padding between lines
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lineSpacingMultiplier works for me with float values like: android:lineSpacingMultiplier="0.8"
– Juan Saravia
Mar 25 '15 at 16:58
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