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What is the most efficient string concatenation method in python?
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Also, .format() has three forms, in order from fast to slow: "{}".format(x), "{0}".format(x), "{x}".format(x=x)
– TemporalWolf
May 1 '17 at 22:45
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Stack vs heap allocation of structs in Go, and how they relate to garbage collection
...nction call, the function value and arguments are evaluated in
the usual order. After they are evaluated, the parameters of the call
are passed by value to the function and the called function begins
execution. The return parameters of the function are passed by value
back to the calling fun...
How to correctly close a feature branch in Mercurial?
...ant to merge results back to the default branch and close feature-x in order to get rid of it in the output of hg branches .
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Is SHA-1 secure for password storage?
...ffline attack is an attack where the attacker has all the data he needs in order to "test" passwords; e.g. the attacker could get a copy of the database holding the hashed passwords. In an offline attack, the attacker is limited only by his computational resources. Conversely, an online attack is an...
Ubuntu, vim, and the solarized color palette
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order apparently matters as well. i found that set t_Co=16 after colorscheme solarized doesn't work. you have to set t_Co before the colorscheme.
– rev
Jan 3 '12 at 18:48
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How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
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PerformSelector:WithObject always takes an object, so in order to pass arguments like int/double/float etc..... You can use something like this.
//NSNumber is an object..
[self performSelector:@selector(setUserAlphaNumber:) withObject: [NSNumber numberWithFloat: 1.0f]
aft...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...omerNumber on a demographic table, or CodeID on a decode table, or perhaps OrderNumber on an order table. By using char, the query engine can more quickly perform the join because it can do straight pointer arithmetic (deterministically) rather than having to move it's pointers a variable amount of...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...ET utf8 COLLATE utf8_general_ci;
Unless you need to sort data in Unicode order, I would suggest altering all your tables to use utf8_general_ci collation, as it requires no code changes, and will speed sorts up slightly.
UPDATE: utf8mb4/utf8mb4_unicode_ci is now the preferred character set/collat...
How to kill a process running on particular port in Linux?
...ion into ~/.bashrc: killp() { kill -9 $(lsof -t -i:"$1" -sTCP:LISTEN) } in order to be able to use it like this killp 3000. (Do not forget to add new lines for { })
– Arthur
Aug 6 at 18:11
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Combining C++ and C - how does #ifdef __cplusplus work?
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It's about the ABI, in order to let both C and C++ application use C interfaces without any issue.
Since C language is very easy, code generation was stable for many years for different compilers, such as GCC, Borland C\C++, MSVC etc.
While C++ ...