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How to keep keys/values in same order as declared?
...ry that I declared in a particular order and want to keep it in that order all the time. The keys/values can't really be kept in order based on their value, I just want it in the order that I declared it.
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How to set a default value for a datetime column to record creation time in a migration?
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You can add a function in a model like this:
before_create :set_foo_to_now
def set_foo_to_now
self.foo = Time.now
end
So that the model will set the current time in the model.
You can also place some sql code in the migration for setting the default value at the database level,...
How to get a reference to current module's attributes in Python
...e added for example, via hooking or by the 3dparty tools like pytest:
*** foo ... ..
*** boo ... ..
*** runtest c:\python\x86\37\lib\site-packages\xonsh\pytest_plugin.py 58
*** pytest_runtest_call c:\python\x86\37\lib\site-packages\_pytest\runner.py 125
*** _multicall c:\python\x86\37\lib\site-pack...
Modern way to filter STL container?
...and if it returns true it copies the value to bar.
The std::back_inserter allows us to actually insert new elements at the end of bar (using push_back()) with an iterator without having to resize it to the required size first.
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What is the difference between instanceof and Class.isAssignableFrom(…)?
...s Y which extends Z which extends A), results might be different.
it is usually advised to write the code first picking one of the operators (the most convenient) and then profile your code to check if there are a performance bottleneck. Maybe this operator is negligible in the context of your code,...
What does placing a @ in front of a C# variable name do? [duplicate]
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It's just a way to allow declaring reserved keywords as vars.
void Foo(int @string)
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Set a persistent environment variable from cmd.exe
...ferent windows machines, but I don't want to be bothered changing them manually by getting on the properties screen of "My Computer"
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“X does not name a type” error in C++
...efined is called an incomplete type.
Consider the simpler example:
struct foo; // foo is *declared* to be a struct, but that struct is not yet defined
struct bar
{
// this is okay, it's just a pointer;
// we can point to something without knowing how that something is defined
foo* fp; ...
Java SafeVarargs annotation, does a standard or best practice exist?
...n StackOverflow about the particular issue with generics and varargs. Basically, it's when you have a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntactic sugar that undergoes a simple "re-writing" at compile-time: a varargs parame...
Force add despite the .gitignore file
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See man git-add:
-f, --force
Allow adding otherwise ignored files.
So run this
git add --force my/ignore/file.foo
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