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How can I use interface as a C# generic type constraint?
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The closest you can do (except for your base-interface approach) is "where T : class", meaning reference-type. There is no syntax to mean "any interface".
This ("where T : class") is used, for example, in WCF to limit clients to service contracts (interfaces).
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Haversine Formula in Python (Bearing and Distance between two GPS points)
... two points
on the earth (specified in decimal degrees)
"""
# convert decimal degrees to radians
lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
# haversine formula
dlon = lon2 - lon1
dlat = lat2 - lat1
a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) ...
UIButton custom font vertical alignment
...ls
FontTools include a TTX tool which enables conversion to and from XML.
Convert your font to .ttx in the same folder
ttx myFontFile.otf
Make the necessary edits to .ttx and delete the .otf file as this will be replaced in the next step.
Convert the file back to .otf
ttx myFontFile.ttx
Motiv...
Function pointers, Closures, and Lambda
I am just now learning about function pointers and, as I was reading the K&R chapter on the subject, the first thing that hit me was, "Hey, this is kinda like a closure." I knew this assumption is fundamentally wrong somehow and after a search online I didn't find really any analysis of this compari...
Why is it impossible to override a getter-only property and add a setter? [closed]
... { return _currentBar; }
}
Since Bar cannot be set as per the BaseClass interface, BarProvider assumes that caching is a safe thing to do - Since Bar cannot be modified. But if set was possible in a derivation, this class could be serving stale values if someone modified the _source object's Bar ...
When to use static vs instantiated classes
...n it's just a tool that works on other stuff (like, for instance, a syntax converter for BB code to HTML ; it doesn't have a life on its own)
(Yeah, I admit, really really overly-simplified...)
One thing about static methods/classes is that they don't facilitate unit testing (at least in PHP, but...
Using two values for one switch case statement
...
class SwitchDemo {
public static void main(String[] args) {
int month = 2;
int year = 2000;
int numDays = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
c...
How to count the number of set bits in a 32-bit integer?
..., you may need to adjust it to work for a particular language (e.g. using uint32_t for C++ and >>> in Java):
int numberOfSetBits(uint32_t i)
{
// Java: use int, and use >>> instead of >>
// C or C++: use uint32_t
i = i - ((i >> 1) & 0x55555555);
...
When would you use delegates in C#? [closed]
...here takes a delegate as a parameter. Since delegates are just function pointers when you pass the method name into the .Where(delegate) that becomes the delegate. Since inMyFamily returns a boolean type it is actually considered a predicate. Predicates are just delegates that return booleans.
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How to escape JSON string?
...s = JsonConvert.ToString(@"a\b");
Console.WriteLine(s);
....
This code prints:
"a\\b"
That is, the resulting string value contains the quotes as well as the escaped backslash.
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