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JavaScript hashmap equivalent
... of the object, e.g., a key, or a set of keys, which are already unique, a combination of keys, which are unique together, or as complex as using some cryptographic hashes like in DojoX encoding, or DojoX UUID. While the latter solutions may produce unique keys, personally I try to avoid them at all...
Compile time string hashing
...rent places that using C++11's new string literals it might be possible to compute a string's hash at compile time. However, no one seems to be ready to come out and say that it will be possible or how it would be done.
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...some systems cheap/fast syscalls are used to implement the mutexes, they become slow (normal) system calls only in case of contention.)
Locking unlocked mutex is really cheap. Unlocking mutex w/o contention is cheap too.
How much does a mutex cost? Is it a problem to have really a lot of mutexe...
Is there a MySQL option/feature to track history of changes to records?
...ld vs new is available and the date this took place. Is there a feature or common technique to do this?
8 Answers
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Is gcc's __attribute__((packed)) / #pragma pack unsafe?
In C, the compiler will lay out members of a struct in the order in which they're declared, with possible padding bytes inserted between members, or after the last member, to ensure that each member is aligned properly.
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What is in your .vimrc? [closed]
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You asked for it :-)
"{{{Auto Commands
" Automatically cd into the directory that the file is in
autocmd BufEnter * execute "chdir ".escape(expand("%:p:h"), ' ')
" Remove any trailing whitespace that is in the file
autocmd BufRead,BufWrite * if ! &b...
What are the mathematical/computational principles behind this game?
...k.
Put card instead of point and picture instead of line and the axioms become:
Every two cards have exactly one picture in common.
For every two pictures there is exactly one card that has both of them.
Now, lets take n=7 and we have the order-7 finite geometry with Q = 7^2 + 7 + 1 . That make...
Node.js vs .Net performance
I've read a lot about Node.js being fast and able to accommodate large amounts of load. Does anyone have any real world evidence of this vs other frameworks, particularly .Net? Most of the articles i've read are anecdotal or don't have comparisons to .Net.
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How to import multiple .csv files at once?
... that all of them have the lower-case extension .csv.
If you then want to combine those data frames into a single data frame, see the solutions in other answers using things like do.call(rbind,...), dplyr::bind_rows() or data.table::rbindlist().
If you really want each data frame in a separate obj...
Using @property versus getters and setters
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