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What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Java
... || in JS (and Perl) and the version in C, C++ and Java is that JS doesn't cast the result to a boolean. It's still a logical operator.
– Alnitak
Jun 22 '11 at 13:36
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pip installing in global site-packages instead of virtualenv
...r instead of the one in the virtualenv folder. Here's how I set up Python3 and virtualenv on OS X Mavericks (10.9.1):
30 An...
Pure JavaScript Send POST Data Without a Form
Is there a way to send data using the POST method without a form and without refreshing the page using only pure JavaScript (not jQuery $.post() )? Maybe httprequest or something else (just can't find it now)?
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How to delete an SMS from the inbox in Android programmatically?
On Android phones SMS messages registered to applications also get sent to the device's inbox. However to prevent clutter, it'd be nice to be able to remove application specific SMS messages from the inbox to reduce the potential overflow of those messages.
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Get generic type of class at runtime
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I am getting java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType for this answer.
– Tomáš Zato - Reinstate Monica
May 1 '15 at 13:14
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C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...imedwait(&condition,&mutex,&t);
}
if(toStop){
pthread_cond_broadcast(&condition);
pthread_mutex_unlock(&mutex);
return -1;
}
int messageLen = strlen(message);
int copyLen = messageLen>=MESSAGE_LENGTH?MESSAGE_LENGTH-1:messageLen;
memcpy(buf[rear],message,copyLen);
...
A cron job for rails: best practices?
...Listener.process_new_messages
puts "done."
end
To execute from the command line, this is just "rake cron". This command can then be put on the operating system cron/task scheduler as desired.
Update this is quite an old question and answer! Some new info:
the heroku cron service I referenced ...
Can overridden methods differ in return type?
...er generates/uses plain classes for nested/inner classes, type erasure and casts for generics, synthetic accessors for nested/inner class private "friendship", synthetic instance fields for outer 'this' pointers, synthetic static fields for '.class' literals, etc, etc.
and covariant return types is...
Delete specific line number(s) from a text file using sed?
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If you want to delete lines 5 through 10 and 12:
sed -e '5,10d;12d' file
This will print the results to the screen. If you want to save the results to the same file:
sed -i.bak -e '5,10d;12d' file
This will back the file up to file.bak, and delete the given li...
Get PostGIS version
...hes the given name and argument types. You might need to add explicit type casts. but this one worked. The problem with the above not working was fixed by doing the CREATE EXTENSION Postgis from the console rather than from the db-migrate.js
– Eric Darchis
Sep ...