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Difference between case object and object
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Case classes differ from regular classes in that they get:
pattern matching support
default implementations of equals and hashCode
default implementations of serialization
a prettier default implementation of toString, and
the small amount of...
Can C++ code be valid in both C++03 and C++11 but do different things?
... right-shift in C++03. This is more likely to break existing code though: (from http://gustedt.wordpress.com/2013/12/15/a-disimprovement-observed-from-the-outside-right-angle-brackets/)
template< unsigned len > unsigned int fun(unsigned int x);
typedef unsigned int (*fun_t)(unsigned int);
temp...
How to get subarray from array?
...have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
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Python xml ElementTree from a string source?
The ElementTree.parse reads from a file, how can I use this if I already have the XML data in a string?
4 Answers
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What is a “context bound” in Scala?
...ter of type Bound[T].
Consider the method tabulate which forms an array from the results of applying
a given function f on a range of numbers from 0 until a given length. Up to Scala 2.7, tabulate could be
written as follows:
def tabulate[T](len: Int, f: Int => T) = {
val xs = new Array[T...
How to compare two colors for similarity/difference
...b of telling you how different they will be PERCEIVED. Human eyes are far from perfect: we're more sensitive to green than red or blue, our brightness perception is logrithmic, etc. OP never specified which s/he wants; but see here for an algorithm specially-tailored for human sight.
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PATH issue with pytest 'ImportError: No module named YadaYadaYada'
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when am i cding to a directory? i am running py.test from my root. unless I am mistaken and you mean as pytest walks through my folders
– MattoTodd
Apr 20 '12 at 21:46
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Where do “pure virtual function call” crashes come from?
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They can result if you try to make a virtual function call from a constructor or destructor. Since you can't make a virtual function call from a constructor or destructor (the derived class object hasn't been constructed or has already been destroyed), it calls the base class versio...
NodeJS: Saving a base64-encoded image to disk
My Express app is receiving a base64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. But the file isn't a valid image file, and the "file" utility simply identifies it as "data".
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How to replace all occurrences of a character in string?
...esn't contain such function but you could use stand-alone replace function from algorithm header.
#include <algorithm>
#include <string>
void some_func() {
std::string s = "example string";
std::replace( s.begin(), s.end(), 'x', 'y'); // replace all 'x' to 'y'
}
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