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Is there a built-in function to print all the current properties and values of an object?
... etc. according to their authors' preferences. But they all basically boil down to this.
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Check number of arguments passed to a Bash script
... "$#" -ne 1 ] && ( usage && exit 1 ) || main
This breaks down to:
test the bash variable for size of parameters $# not equals 1 (our number of sub commands)
if true then call usage() function and exit with status 1
else call main() function
Thinks to note:
usage() can just b...
Why are C++ inline functions in the header?
...its to contain (identical) definitions.
The two explanations really boil down to the fact that the inline keyword doesn't exactly do what you'd expect.
A C++ compiler is free to apply the inlining optimization (replace a function call with the body of the called function, saving the call overhead...
Vim: apply settings on files in directory
...rectory.
It's also recommended to :set secure when using this. This locks down :autocmd, shell and write commands for .vimrc in the current directory.
Another thing that might be worth looking at is setting up a session (:h session) with a standard view and settings for the project.
All that said...
How do I use valgrind to find memory leaks?
... malloc. In a larger program, that would be seriously troublesome to
hunt down. This is because of how the executable was compiled. We can
actually get line-by-line details on what went wrong. Recompile your program
with a debug flag (I'm using gcc here):
gcc -o executable -std=c11 -Wall main.c ...
How to create the most compact mapping n → isprime(n) up to a limit N?
...t N primes on the internet with N stretching up to at least fifty million. Download the files and use them, it's likely to be much faster than any other method you'll come up with.
If you want an actual algorithm for making your own primes, Wikipedia has all sorts of good stuff on primes here, incl...
Difference between Key, Primary Key, Unique Key and Index in MySQL
...x. Adding an index can improve the performance of queries (but it can slow down modifications to the table).
You should use UNIQUE when you want to contrain the values in that column (or columns) to be unique, so that attempts to insert duplicate values result in an error.
A PRIMARY KEY is both a ...
How do I get git to default to ssh and not https for new repositories
...ge is just a suggested list of commands (and GitHub now suggests using the HTTPS protocol). Unless you have administrative access to GitHub's site, I don't know of any way to change their suggested commands.
If you'd rather use the SSH protocol, simply add a remote branch like so (i.e. use this com...
How to find Unused Amazon EC2 Security groups
... need to actually confirm the delete, in the popup it will show you a breakdown of which ones can be deleted (orphan) and which can't. You can then press cancel and then delete the orphan ones.
– rjarmstrong
Jun 21 '18 at 7:03
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Working with time DURATION, not time of day
...d hit enter/return. Grab the lower right corner of cell B2 and drag as far down as the A column goes to apply the formula to all data in col A.
Last step, be sure to highlight all of column B and set it to Number format (the application of the formula may have automatically set format to Time).
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