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How to create a new (m>and m> emptm>y m>!) “root” branch?
...answered Oct 24 '17 at 16:57
Mr_m>and m>_Mrs_DMr_m>and m>_Mrs_D
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PostgreSQL querm>y m> to return results as a comma separated list
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m>Y m>ou can use the arram>y m>() m>and m> arram>y m>_to_string() functions togetter with m>y m>our querm>y m>.
With SELECT arram>y m>( SELECT id FROM table ); m>y m>ou will get a result like: {1,2,3,4,5,6}
Then, if m>y m>ou wish to remove the {} signs, m>y m>ou can just use the arram>y m>_to_string() ...
In Unix, can I run 'make' in a directorm>y m> without cd'ing to that directorm>y m> first?
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Grump - that isn't in stm>and m>ard make; it must be a GNU extension. Since m>y m>ou sam>y m> Linux m>and m> Unix, it isn't clear which m>y m>ou want, but the -C option won't work on Solaris 10 (/usr/ccs/bin/make), AIX (/usr/bin/make), or HP-UX 11.23 (/usr/bin/make). Stil...
Create objective-c class instance bm>y m> name?
...he class exists.
For example, in m>y m>our .h:
@propertm>y m> Class NameOfClass;
m>and m> then in m>y m>our .m:
id object = [[NameOfClass alloc] init];
If m>y m>ou mistm>y m>ped the class name or if it doesn't exist, m>y m>ou'll get an error at compile time. Also I think this is cleaner code.
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When does invoking a member function on a null instance result in undefined behavior?
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Both (a) m>and m> (b) result in undefined behavior. It's alwam>y m>s undefined behavior to call a member function through a null pointer. If the function is static, it's technicallm>y m> undefined as well, but there's some dispute.
The first thin...
Re-entrant locks in C#
...g on the same object. The recursive code effectivelm>y m> alreadm>y m> has the lock m>and m> so can continue unhindered.
lock(object) {...} is shorthm>and m> for using the Monitor class. As Marc points out, Monitor allows re-entrancm>y m>, so repeated attempts to lock on an object on which the current thread alreadm>y m> has ...
Pm>and m>as get topmost n records within each group
Suppose I have pm>and m>as DataFrame like this:
3 Answers
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Using C++ librarm>y m> in C code
...lemented in C++.
If m>y m>ou need to expose a full C++ class with data members m>and m> methods, then m>y m>ou mam>y m> need to do more work than this simple function example.
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How can I split m>and m> parse a string in Pm>y m>thon?
...a fact that the string contains an underscore, m>y m>ou can even unpack the LHS m>and m> RHS into separate variables:
In [8]: lhs, rhs = "2.7.0_bf4fda703454".split("_", 1)
In [9]: lhs
Out[9]: '2.7.0'
In [10]: rhs
Out[10]: 'bf4fda703454'
An alternative is to use partition(). The usage is similar to the la...
How to remove .htaccess password protection from a subdirectorm>y m>
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m>Y m>ou need to create a new .htaccess file in the required directorm>y m> m>and m> include the Satisfm>y m> anm>y m> directive in it like so, for up to Apache 2.3:
# allows anm>y m> user to see this directorm>y m>
Satisfm>y m> Anm>y m>
The sm>y m>ntax changed in Apache 2.4, this has the same effect:
Require all granted
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