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Create a list from two object lists with linq
...write a comparer class which uses the IEqualityComparer interface. You can then provide this comparer as the second parameter in the Linq extension Union method. More information on how to write such a comparer method can be found on http://msdn.microsoft.com/en-us/library/system.collections.iequali...
Can you attach Amazon EBS to multiple instances?
...e non-shared levels like the Dom0 kernel, Xen layer, and DomU kernel. And then there's the performance considerations of synchronizing blocks between multiple clients - most of the clustered filesystems are designed to work on high speed dedicated SANs, not a best-effort commodity ethernet. It sou...
How can I disable logging while running unit tests in Python Django?
...ul in figuring out why a test failed. If logging is completely turned off, then there's nothing that can be captured.
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Nullable Foreign Key bad practice?
...f x and y are both nullable, and indeed in some row x and y are both null, then WHERE x=y does not yield true. This proves beyond reasonable doubt that null is not a value (because any real value is always equal to itself). And since the RM prescribes that "there must be a value in every cell of a...
Can a class member function template be virtual?
...rs sees void f(concr_base& cb, virt_base& vb) { cb.f(); vb.f(); }, then it "knows" which function is invoked at the point cb.f() called, and does not know that for vb.f(). The latter has to be found out at runtime, by the runtime system. Whether you want to call this "figuring out", and whet...
What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...mething like this.
List<Person> foo = new List<Person>();
and then the compiler will prevent you from putting things that aren't Person into the list.
Behind the scenes the C# compiler is just putting List<Person> into the .NET dll file, but at runtime the JIT compiler goes and b...
Executing Shell Scripts from the OS X Dock?
...could create a Automator workflow with a single step - "Run Shell Script"
Then File > Save As, and change the File Format to "Application". When you open the application, it will run the Shell Script step, executing the command, exiting after it completes.
The benefit to this is it's really sim...
Git stash twice
...sh@{1}: WIP on master: 50cf63b Commit message B
If you made two stashes, then just call git stash pop twice. As opposed to git stash apply, pop applies and removes the latest stash.
You can also reference a specific stash, e.g.
git stash show stash@{1}
or
git stash apply stash@{1}
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How to make PyCharm always show line numbers
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For version 4.0, 4.5 on Windows
File -> Settings
Then,
Editor -> General -> Appearance -> Show line numbers
For version 4.0 on Mac OSX
PyCharm-->Preferences
Then,
Editor-->General-->Appearance-->checkbox: "Show line numbers"
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Git copy file preserving history [duplicate]
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Why does git mv exist then?
– skirsch
Jul 9 '18 at 9:24
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