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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
...e).
Another example:
[...]
auto precision = std::cout.precision();
auto set_precision_back = finally( [precision, &std::cout]() { std::cout << std::setprecision(precision); } );
std::cout << std::setprecision(3);
The disable member is useful if the finally has to be called only ...
Most efficient T-SQL way to pad a varchar on the left to a certain length?
... There's times where it's needed ... for example, fetching a subset of data for a paged screen.
– Beep beep
Sep 21 '10 at 5:06
7
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How to include a quote in a raw Python string
... editor after snippets, if snippets enabled
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How can I generate Unix timestamps?
...the format defined by -f, and then prints it out (-j says don't attempt to set the date) in the form +%s, seconds since epoch.
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C++ cout hex values?
... restoring dec over hex is that dec may not have been the value previously set, especially if you're writing a generic library method. This question has some answers about how to store and restore state. You can save state with ios::fmtflags f(cout.flags()); and restore it with out.flags(f);.
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C++ templates Turing-complete?
... enum { val = 1 };
}
const int num = Factorial<10>::val; // num set to 10! at compile time.
The point is to demonstrate that the compiler is completely evaluating the recursive definition until it reaches an answer.
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Using multiple delimiters in awk
....2 quest.example.com
tc0001 tomcat7.5 www.example.com
Here:
-F"/|=" sets the input field separator to either / or =. Then, it sets the output field separator to a tab.
-vOFS='\t' is using the -v flag for setting a variable. OFS is the default variable for the Output Field Separator and it is ...
When is assembly faster than C?
...ve operators for at all, like popcnt or bit-scan to find the first or last set bit. (POSIX has a ffs() function, but its semantics don't match x86 bsf / bsr. See https://en.wikipedia.org/wiki/Find_first_set).
Some compilers can sometimes recognize a loop that counts the number of set bits in an i...
LINQ Aggregate algorithm explained
...ified function to transform (currentValue, sequenceValue) into (nextValue)
Set currentValue = nextValue
Return the final currentValue
You may find the Aggregate post in my Edulinq series useful - it includes a more detailed description (including the various overloads) and implementations.
One s...
Convert Year/Month/Day to Day of Year in Python
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There is a very simple solution:
from datetime import datetime
day_of_year = datetime.now().timetuple().tm_yday
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