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Constructor in an Interface?
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Couldn't the language have done it by allowing things like class A implements Named, HashList { A(){HashList(new list()); Named("name");} }
– mako
Sep 10 '13 at 23:19
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Can I record/play macros in Visual Studio 2012/2013/2015/2017/2019?
...veloper Preview
I have started to get around this (although inconvenient) by cutting/pasting into Notepad++, record and run the macro there and then cut/paste it back into Visual Studio 2012.
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B-Tree vs Hash Table
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You can only access elements by their primary key in a hashtable.
This is faster than with a tree algorithm (O(1) instead of log(n)), but you cannot select ranges (everything in between x and y).
Tree algorithms support this in Log(n) whereas hash indexe...
What does int argc, char *argv[] mean?
...sed to main() in C and C++.
argc will be the number of strings pointed to by argv. This will (in practice) be 1 plus the number of arguments, as virtually all implementations will prepend the name of the program to the array.
The variables are named argc (argument count) and argv (argument vector...
techniques for obscuring sensitive strings in C++
...ng key with XOR
For instance, you could use XOR to split the key into two byte arrays:
key = key1 XOR key2
If you create key1 with the same byte-length as key you can use (completely) random byte values and then compute key2:
key1[n] = crypto_grade_random_number(0..255)
key2[n] = key[n] XOR key...
Putting text in top left corner of matplotlib plot
...'t want an actual legend. You can specify the placement of the legend box by using the loc keyterm. More information can be found at this website but I've also included an example showing how to place a legend:
ax.scatter(xa,ya, marker='o', s=20, c="lightgreen", alpha=0.9)
ax.scatter(xb,yb, marke...
How to open the default webbrowser using java
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As noted in the answer provided by Tim Cooper, java.awt.Desktop has provided this capability since Java version 6 (1.6), but with the following caveat:
Use the isDesktopSupported() method to determine whether the Desktop API is available. On the Solaris...
Is there any way in C# to override a class method with an extension method?
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@Alex by mentioning virtual I am simply clarifying what it means to be polymorphic. In virtually all uses of GetHashCode, the concrete type is unknown - so polymorphism is in play. As such, extension methods wouldn't help even if t...
How to elegantly check if a number is within a range?
...rendous performance if your ranges are quite large. Please see the answer by @olivier-jacot-descombes
– Aaron Hudon
Oct 20 '16 at 19:16
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How can I append a string to an existing field in MySQL?
...case somebody runs into the same issue as I did: If the field code is NULL by default you need to use: UPDATE categories SET code = CONCAT(IFNULL(code,''), '_standard') WHERE id = 1; Otherwise the concat will always result in NULL.
– Kai Noack
May 4 '15 at 17:2...