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Mixins vs. Traits
...rait' and 'mixin' are used in the wild is highly inconsistent and at least one of the points here is mostly wrong. PHP and Wikipedia (and according to @Sergio, also Scala) disagree with you about traits being stateless. I don't find this answer useful because it's made up of bare assertions, and it'...
Order of member constructor and destructor calls
... get destructed in the reverse order they were created. The reason is that one object may use another, thus depend on it. Consider:
struct A { };
struct B {
A &a;
B(A& a) : a(a) { }
};
int main() {
A a;
B b(a);
}
If a were to destruct before b then b would hold an invalid mem...
MySQL CONCAT returns NULL if any field contain NULL
... that this solution hides a complete "column" (including the separator) if one of the middle fields is NULL. So this answer is only correct assuming that only the last field(s) can be NULL. Depending on your need, the COALEASE() answer below might be better.
– Jannes
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Plot a legend outside of the plotting area in base graphics?
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No one has mentioned using negative inset values for legend. Here is an example, where the legend is to the right of the plot, aligned to the top (using keyword "topright").
# Random data to plot:
A <- data.frame(x=rnorm(100...
Spring: Why do we autowire the interface and not the implemented class?
...ementation of the interface and that implementation is annotated with @Component with Spring's component scan enabled, Spring framework can find out the (interface, implementation) pair. If component scan is not enabled, then you have to define the bean explicitly in your application-config.xml (or ...
How to interactively (visually) resolve conflicts in SourceTree / git
...and merging. I've installed KDiff3 and like it well enough. When you're done, click OK.
Now when there is a merge, you can go under Actions->Resolve Conflicts->Launch External Merge Tool.
share
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Changing names of parameterized tests
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:-) One of my co-developers today had a problem with it since the version I point to in the above message uses JUnit 4.3.1 (not 4.4 as I originally said). He is using JUnit 4.5.0 and it caused problems. I'll be addressing these t...
How can you search Google Programmatically Java API [closed]
Does anyone know if and how it is possible to search Google programmatically - especially if there is a Java API for it?
8 ...
Show dialog from fragment?
... The ListFragment subclass would use DialogFragments by instantiating new ones, not by subclassing DialogFragment. (A DialogFragment is a dialog implemented as a Fragment, not a Fragment which may display Dialogs.)
– nmr
Sep 1 '11 at 22:07
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Execute Python script via crontab
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As you have mentioned doesn't changes anything,
First, you should redirect both stdin and stderr from crontab execution like below:
*/2 * * * * /usr/bin/python /home/souza/Documets/Listener/listener.py > /tmp/listener.log 2>&1
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