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Performance optimization strategies of last resort [closed]
There are plenty of performance questions on this site already, but it occurs to me that almost all are very problem-specific and fairly narrow. And almost all repeat the advice to avoid premature optimization.
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.prop() vs .attr()
... @Neal: Re what makes it different: The source and nature of the information. Look at Tim's value example, for instance. A function called attr that retrieves the property value rather than the attribute "value" doesn't make much sense (and they can be different). Going forward, attr doing a...
What are the mathematical/computational principles behind this game?
...t straightforward in the case of prime order p. Then the integers modulo p form a finite field which can be used to describe coordinates for the points and lines in the plane. There are 3 different kinds of coordinates for points: (1,x,y), (0,1,x), and (0,0,1), where x and y can take on values from ...
How do you detect where two line segments intersect? [closed]
...s. So... do I just divide the z component by the other z component? Is the formula for t actually |(q − p) × s| / |(r × s)|?
– LarsH
Aug 31 '12 at 3:40
7
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How to measure time in milliseconds using ANSI C?
...OCK_MONOTONIC is not implemented on many systems (including many Linux platforms).
– Dipstick
Aug 9 '09 at 9:13
2
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How do I get current date/time on the Windows command line in a suitable format for usage in a file/
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See Windows Batch File (.bat) to get current date in MMDDYYYY format:
@echo off
For /f "tokens=2-4 delims=/ " %%a in ('date /t') do (set mydate=%%c-%%a-%%b)
For /f "tokens=1-2 delims=/:" %%a in ('time /t') do (set mytime=%%a%%b)
echo %mydate%_%mytime%
If you prefer the time in 24 hou...
OO Design in Rails: Where to put stuff
...es classes when the object is intended to be used by helpers (for instance Form Builders).
This is a really general overview. Please provide more details about specific examples if you want to get more customized suggestions. :)
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Undefined behavior and sequence points
... of the C++ standard. The C++11 and C++14 versions of the standard do not formally contain 'sequence points'; operations are 'sequenced before' or 'unsequenced' or 'indeterminately sequenced' instead. The net effect is essentially the same, but the terminology is different.
Disclaimer : Okay. T...
What is 'Pattern Matching' in functional languages?
... of equivalence instead of assignment.
Long answer: Pattern matching is a form of dispatch based on the “shape” of the value that it's given. In a functional language, the datatypes that you define are usually what are known as discriminated unions or algebraic data types. For instance, what'...
Why is “while ( !feof (file) )” always wrong?
...d in fact unreasonable, to ask an I/O system whether it will be able to perform an I/O operation. The only possible way we can interact with it (just as with a concurrent container) is to attempt the operation and check whether it succeeded or failed. At that moment where you interact with the envir...