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How do BitTorrent magnet links work?
...t find any answers. The wiki says xt means "exact topic" and is followed by the format ( btih in this case) with a SHA1 hash. I saw base32 mentioned, knowing it's 5 bits per character and 32 characters, I found it holds exactly 160bits, which is exactly the size of the SHA1.
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How to show first commit by 'git log'?
...he developers of “bar” decide to incorporate libfoo into their project by using a subtree merge. Prior to this merge it might have been trivial to determine the “first” commit in bar.git (there was probably only one root commit). After the merge, however, there are multiple root commits and ...
How to track down a “double free or corruption” error
...ort at the point where the double free is done.
You can set this from gdb by using the set environment MALLOC_CHECK_ 2 command before running your program; the program should abort, with the free() call visible in the backtrace.
see the man page for malloc() for more information
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Do c++11 lambdas capture variables they don't use?
...use [=] to indicate that I would like all local variables to be captured by value in a lambda, will that result in all local variables in the function being copied, or just all local variables that are used by the lambda ?
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When should I use semicolons in SQL Server?
While checking some code on the web and scripts generated by SQL Server Management Studio I have noticed that some statements are ended with a semicolon.
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How does the main() method work in C?
... conventions which obeys these rules is stack-based parameter passing whereby the caller pops the arguments, and they are pushed right to left:
;; pseudo-assembly-language
;; main(argc, argv, envp); call
push envp ;; rightmost argument
push argv ;;
push argc ;; leftmost argument ends up o...
Edit a commit message in SourceTree Windows (already pushed to remote)
...the comment message includes non-English characters, using method provided by user456814, those characters will be replaced by question marks. (tested under sourcetree Ver2.5.5.0)
So I have to use the following method.
CAUTION: if the commit has been pulled by other members, changes below might ca...
Why are floating point numbers inaccurate?
...must be integers. In other words, all floats must be an integer multiplied by an integer power of 2.
9.2 may be simply 92/10, but 10 cannot be expressed as 2n if n is limited to integer values.
Seeing the Data
First, a few functions to see the components that make a 32- and 64-bit float. Gloss...
Algorithm to generate a crossword
... most efficient, but it works well enough. Basically:
Sort all the words by length, descending.
Take the first word and place it on the board.
Take the next word.
Search through all the words that are already on the board and see if there are any possible intersections (any common letters) with th...
What is the difference between LL and LR parsing?
...to the right and attempt to construct a leftmost derivation. This is done by beginning at the start symbol and repeatedly expanding out the leftmost nonterminal until we arrive at the target string. An LR parse is a left-to-right, rightmost derivation, meaning that we scan from the left to right a...