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Is gcc 4.8 or earlier buggy about regular expressions?
... highly experimental, tracking early C++0x drafts and being made available for people to experiment with. That allowed people to find problems and give feedback to the standard committee before the standard was finalised. At the time lots of people were grateful to have had access to bleeding edge f...
How to modify a global variable within a function in bash?
...unc() {
echo "Hello"
}
var="$(myfunc)"
echo "$var"
Gives:
Hello
For a numerical value from 0-255, you can use return to pass the number as the exit status:
mysecondfunc() {
echo "Hello"
return 4
}
var="$(mysecondfunc)"
num_var=$?
echo "$var - num is $num_var"
Gives:
Hello - ...
How to add property to a class dynamically?
...a thing called a descriptor. It's an object that provides custom handling for a given attribute, on a given class. Kinda like a way to factor a huge if tree out of __getattribute__.
When I ask for foo.b in the example above, Python sees that the b defined on the class implements the descriptor pr...
Explaining Python's '__enter__' and '__exit__'
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@Grief : For 2 reasons, In my opinion, 1) i won't be able to call other methods on self object as explained here : stackoverflow.com/questions/38281853/… 2) self.XYZ is just part of self object and returning handle only to just tha...
Can I redirect the stdout in python into some sort of string buffer?
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I think there is no need to add try/finally block for this solution.
– snr
Jul 16 '18 at 14:50
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What is the preferred/idiomatic way to insert into a map?
...r functions are not functionally equivalent :
The operator[] will search for the key, insert a default constructed value if not found, and return a reference to which you assign a value. Obviously, this can be inefficient if the mapped_type can benefit from being directly initialized instead of de...
How to get a reference to a module inside the module itself?
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except for this won't be quite correct if module is reloaded; I don't think there's any place where a reference is guaranteed to be kept, if there was, reloading wouldn't really work, right?
– Dima Tisnek
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Run function from the command line
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For some reason, this didn't work for me, while replacing print foo.hello() with print(foo.hello()) did. I don't have the python knowledge to explain why this is, so if someone else could explain what can be going on, that wo...
Convert a String In C++ To Upper Case
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This appears to perform extremely badly with g++ 5.2 -O3, and Boost 1.58 (like 30x worse than calling glibc's toupper in a loop.) There's a dynamic_cast of the locale that doesn't get hoisted out of the per-char loop. See my answer. On the p...
Why do people use __(double underscore) so much in C++
...dations :
The use of two underscores (`__') in identifiers is reserved for the compiler's internal use according to the ANSI-C standard.
Underscores (`_') are often used in names of library functions (such as "_main" and "_exit"). In order to avoid collisions, do not begin an identifier wit...