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What are the rules for the “…” token in the context of variadic templates?
...
In the context of variadic template, the ellipsis ... is used to unpack the template parameter pack if it appears on the right side of an expression (call this expression pattern for a moment), or it's a pack argument if it appears on le...
How to sort an array in descending order in Ruby
...{
ary << {:bar => rand(1000)}
}
n = 500
Benchmark.bm(20) do |x|
x.report("sort") { n.times { ary.sort{ |a,b| b[:bar] <=> a[:bar] } } }
x.report("sort reverse") { n.times { ary.sort{ |a,b| a[:bar] <=> b[:bar] }.reverse } }
x.report("sort_by -a[:bar]...
Paging UICollectionView by cells, not screen
...h;
int minSpace = 10;
int cellToSwipe = (scrollView.contentOffset.x)/(pageWidth + minSpace) + 0.5; // cell width + min spacing for lines
if (cellToSwipe < 0) {
cellToSwipe = 0;
} else if (cellToSwipe >= self.articles.count) {
cellToSwipe = self.articles.count -...
How to sort strings in JavaScript
...
Use String.prototype.localeCompare a per your example:
list.sort(function (a, b) {
return ('' + a.attr).localeCompare(b.attr);
})
We force a.attr to be a string to avoid exceptions. localeCompare has been supported since Internet Explorer 6 and Firefox 1. You may a...
Iterating over dictionaries using 'for' loops
... To loop over both key and value you can use the following:
For Python 3.x:
for key, value in d.items():
For Python 2.x:
for key, value in d.iteritems():
To test for yourself, change the word key to poop.
In Python 3.x, iteritems() was replaced with simply items(), which returns a set-like ...
How to set Python's default version to 3.x on OS X?
...
Changing the default python executable's version system-wide could break some applications that depend on python2.
However, you can alias the commands in most shells, Since the default shells in macOS (bash in 10.14 and below; zsh in 10.15) share a simi...
Move capture in lambda
...;
struct rref_impl
{
rref_impl() = delete;
rref_impl( T && x ) : x{std::move(x)} {}
rref_impl( rref_impl & other )
: x{std::move(other.x)}, isCopied{true}
{
assert( other.isCopied == false );
}
rref_impl( rref_impl && other )
: x{st...
C++ templates Turing-complete?
...
Example
#include <iostream>
template <int N> struct Factorial
{
enum { val = Factorial<N-1>::val * N };
};
template<>
struct Factorial<0>
{
enum { val = 1 };
};
int main()
{
// Not...
Reordering of commits
...story should look like this:
c - [a+d+e+g] - [b+f] (branchA)
/
--o-x-x-x-x-x-x-x-x-x-x (master)
Now, let's grab the newly-squashed commit b+f for branchB.
git checkout branchB
git cherry-pick branchA # cherry-pick one commit, the tip of branchA
And the same for a+d+e+g for master:
git...
Print a file, skipping the first X lines, in Bash [duplicate]
... long file which I want to print, skipping the first 1,000,000 lines, for example.
13 Answers
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