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Continuously read from STDOUT of external process in Ruby
I want to run blender from the command line through a ruby script, which will then process the output given by blender line by line to update a progress bar in a GUI. It's not really important that blender is the external process whose stdout I need to read.
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“Inner exception” (with traceback) in Python?
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A Python2 and 3 compliant way is possible using the future package: python-future.org/compatible_idioms.html#raising-exceptions E.g. from future.utils import raise_ and raise_(ValueError, None, sys.exc_info()[2]).
– jtp...
What is “:-!!” in C code?
...d read the expression like this:
sizeof(struct { int: -!!(e); }))
(e): Compute expression e.
!!(e): Logically negate twice: 0 if e == 0; otherwise 1.
-!!(e): Numerically negate the expression from step 2: 0 if it was 0; otherwise -1.
struct{int: -!!(0);} --> struct{int: 0;}: If it was zero, t...
Factory Pattern. When to use factory methods?
... know about the dependencies of the Thing, except for the string data that comes from the consumer.
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Difference between return and exit in Bash functions
... n to its caller. If n is omitted, the return status is that of the last command executed in the function body.
... on exit [n]:
Cause the shell to exit with a status of n. If n is omitted, the exit status is that of the last command executed. A trap on EXIT is executed befor...
Accessing Object Memory Address
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Some ways to use it (to compare the value it contains): forum.freecodecamp.com/t/python-id-object/19207
– J. Does
Mar 15 '17 at 21:33
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How do you implement a class in C? [closed]
Assuming I have to use C (no C++ or object oriented compilers) and I don't have dynamic memory allocation, what are some techniques I can use to implement a class, or a good approximation of a class? Is it always a good idea to isolate the "class" to a separate file? Assume that we can preallocate t...
How to perform .Max() on a property of all objects in a collection and return the object with maximu
... edited May 23 '17 at 11:47
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answered Jul 9 '09 at 5:32
Jon SkeetJon Skeet
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Why can't I use switch statement on a String?
...gh-level syntax using String constants in case declarations is expanded at compile-time into more complex code following a pattern. The resulting code uses JVM instructions that have always existed.
A switch with String cases is translated into two switches during compilation. The first maps each s...
Why use a ReentrantLock if one can use synchronized(this)?
...about this here.
This claim has been contested, however; see the following comment:
In the reentrant lock test, a new lock is created each time, thus there is no exclusive locking and the resulting data is invalid. Also, the IBM link offers no source code for the underlying benchmark so its impossi...