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What is the Swift equivalent to Objective-C's “@synchronized”?
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You can use GCD. It is a little more verbose than @synchronized, but works as a replacement:
let serialQueue = DispatchQueue(label: "com.test.mySerialQueue")
serialQueue.sync {
// code
}
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Copy a table from one database to another in Postgres
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Extract the table and pipe it directly to the target database:
pg_dump -t table_to_copy source_db | psql target_db
Note: If the other database already has the table set up, you should use the -a flag to import data only, else you may see weird error...
bash: pip: command not found
...ep in the tutorial is to run pip install <lib you want> but before it even tries to find anything online I get an error "bash: pip: command not found".
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ActionController::InvalidAuthenticityToken
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I had the same issue but with pages which were page cached. Pages got buffered with a stale authenticity token and all actions using the methods post/put/delete where recognized as forgery attempts. Error (422 Unprocessable Entity) was returned to the...
What is :: (double colon) in Python when subscripting sequences?
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it means 'nothing for the first argument, nothing for the second, and jump by three'. It gets every third item of the sequence sliced.
Extended slices is what you want. New in Python 2.3
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How to get notified about changes of the history via history.pushState?
...t HTML5 introduces history.pushState to change the browsers history, websites start using this in combination with Ajax instead of changing the fragment identifier of the URL.
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How do I add the contents of an iterable to a set?
What is the "one [...] obvious way" to add all items of an iterable to an existing set ?
6 Answers
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Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v
...tput):
env | grep rvm
if there was output, try to open new terminal, if it does not help then restart your computer.
install RVM:
\curl -L https://get.rvm.io |
bash -s stable --ruby --autolibs=enable --auto-dotfiles
If you find you need some hand-holding, take a look at Installing Ruby on ...
Apache not starting on MAMP Pro
Apache wont start and it throws an error:
2 Answers
2
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c++ 代码提升权限，请求管理员身份运行权限 - 脚本技术 - 清泛IT社区，为创...
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// ------提升权限------
// Initialize the structure.
SHELLEXECUTEINFO sei = { sizeof(SHELLEXECUTEINFO) };
sei.fMask = SEE_MASK_NOCLOSEPROCESS;
&nb...