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How to get the index of an item in a list in a single step?
...search; therefore, this method is an
O(n) operation, where n is Count.
If the item is not found, it will return -1
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Best practices for circular shift (rotate) operations in C++
Left and right shift operators (>) are already available in C++.
However, I couldn't find out how I could perform circular shift or rotate operations.
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How to replace an entire line in a text file by line number
...his replaces the line in the original file. To save the changed text in a different file, drop the -i option:
sed 'Ns/.*/replacement-line/' file.txt > new_file.txt
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“unmappable character for encoding” warning in Java
... characters... they are parsed before doing lexical analysis. For example, if you put this comment /* c:\unit */ to your code, it will not compile anymore, because "nit" isn't correct hex number.
– Peter Štibraný
Jan 21 '09 at 11:25
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What is the difference between vmalloc and kmalloc?
...ical blocks of memory. However, it also seems as though kmalloc can fail if a contiguous physical block that you want can't be found.
What are the advantages of having a contiguous block of memory? Specifically, why would I need to have a contiguous physical block of memory in a system call...
Is it good practice to use java.lang.String.intern()?
...you're relying on the strings being internalized.
The second disadvantage if you decide to internalize strings is that the intern() method is relatively expensive. It has to manage the pool of unique strings so it does a fair bit of work (even if the string has already been internalized). So, be ca...
Uniq by object attribute in Ruby
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The hash method is better if you want to group by say album_id while (say) summing up num_plays.
– thekingoftruth
Sep 13 '13 at 22:59
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Generate colors between red and green for a power meter?
... N steps, each step you increment X by (Y-X)/N - though it will look nicer if you move in the HSV space rather than RGB
– Paul Dixon
Sep 19 '14 at 15:44
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error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
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I had that problem when using MS Visual Studio. If your environment is different that you might have to fix it differently. But it should still be a linker problem.
– Bohdan
Oct 2 '14 at 22:13
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How can a Java program get its own process ID?
...and a Java virtual
machine implementation can choose to embed platform-specific useful
information in the returned name string. Each running virtual machine
could have a different name.
In Java 9 the new process API can be used:
long pid = ProcessHandle.current().pid();
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