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What are the main purposes of using std::forward and which problems it solves?
In perfect forwarding, std::forward is used to convert the named rvalue references t1 and t2 to unnamed rvalue references. What is the purpose of doing that? How would that affect the called function inner if we leave t1 & t2 as lvalues?
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Difference between passing array and array pointer into function in C
...tialize an array, an expression that has type ‘‘array of type’’ is
converted to an expression with type ‘‘pointer to type’’ that points to the initial element of
the array object and is not an lvalue. If the array object has register storage class, the
behavior is undefined.
Given ...
How to convert comma-separated String to List?
Is there any built-in method in Java which allows us to convert comma separated String to some container (e.g array, List or Vector)? Or do I need to write custom code for that?
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PHP - Extracting a property from an array of objects
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$idCats = array_column($cats, 'id');
But the son has to be an array or converted to an array
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Can't import my own modules in Python
...would have to mess with your path. This can be done within Python:
import sys
sys.path.append("..")
from myapp import SomeObject
though that is generally not recommended.
In general, if you want other people to use your Python package, you should use distutils to create a setup script. That way,...
How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
...een: g, blue: b, alpha: a)
}
}
}
The reason you have to draw/convert the image first into a buffer is because images can have several different formats. This step is required to convert it to a consistent format you can read.
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Set time to 00:00:00
...Use *java.time* instead.
.toInstant() // Convert this moment in UTC from the legacy class `Date` to the modern class `Instant`.
.atZone( ZoneId.of( "Africa/Tunis" ) ) // Adjust from UTC to the wall-clock time used by the people of a particular region (a time...
Why don't structs support inheritance?
...= new Derived[2];
Square (v);
By normal conversion rules, a Derived[] is convertible to a Base[] (for better or worse), so if you s/struct/class/g for the above example, it'll compile and run as expected, with no problems. But if Base and Derived are value types, and arrays store values inline, th...
How to obtain a Thread id in Python?
...id on Linux:
import ctypes
libc = ctypes.cdll.LoadLibrary('libc.so.6')
# System dependent, see e.g. /usr/include/x86_64-linux-gnu/asm/unistd_64.h
SYS_gettid = 186
def getThreadId():
"""Returns OS thread id - Specific to Linux"""
return libc.syscall(SYS_gettid)
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Getting the exception value in Python
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If you don't know the type/origin of the error, you can try:
import sys
try:
doSomethingWrongHere()
except:
print('Error: {}'.format(sys.exc_info()[0]))
But be aware, you'll get pep8 warning:
[W] PEP 8 (E722): do not use bare except
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