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Traits vs. interfaces
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Except that traits are not interfaces at all. Interfaces are specification that can be checked against. Traits cannot be checked against, hence they are implementation only. They are the exact opposite of interfaces. That line in the RFC is simply wrong...
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Scala: Nil vs List()
In Scala, is there any difference at all between Nil and List() ?
3 Answers
3
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SQLAlchemy: how to filter date field?
...In fact, your query is right except for the typo: your filter is excluding all records: you should change the <= for >= and vice versa:
qry = DBSession.query(User).filter(
and_(User.birthday <= '1988-01-17', User.birthday >= '1985-01-17'))
# or same:
qry = DBSession.query(User)....
MongoDB not equal to
...b.inventory.find( { price: { $not: { $gt: 1.99 } } } )
That would select all documents where:
The price field value is less than or equal to 1.99 or the price
Field does not exist
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How to initialize std::vector from C-style array?
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Don't forget that you can treat pointers as iterators:
w_.assign(w, w + len);
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Is it possible to specify condition in Count()?
Is it possible to specify a condition in Count() ? I would like to count only the rows that have, for example, "Manager" in the Position column.
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Port 80 is being used by SYSTEM (PID 4), what is that?
...P adress is 0.0.0.0, state = LISTENING: means that port 80 is listening to all interfaces (not used)
How to read NETSTAT -AN results:
https://sites.google.com/site/xiangyangsite/home/technical-tips/linux-unix/networks-related-commands-on-linux/how-to-read-netstat--an-results
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What's the significance of Oct 12 1999? [closed]
In the SignOut method of System.Web.Security.FormsAuthentication , the ASP.NET team chose to expire the FormsAuth cookie by setting the expiration date to "Oct 12 1999".
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How do I SET the GOPATH environment variable on Ubuntu? What file must I edit?
...answer.
Old Way:
Just add the following lines to ~/.bashrc and this will persist. However, you can use other paths you like as GOPATH instead of $HOME/go in my sample.
export GOPATH=$HOME/go
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
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Android Studio installation on Windows 7 fails, no JDK found
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Adding a system variable JDK_HOME with value c:\Program Files\Java\jdk1.7.0_21\ worked for me. The latest Java release can be downloaded here.
Additionally, make sure the variable JAVA_HOME is also set with the above location.
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