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What is the logic behind the “using” keyword in C++?
...n-deducible context. That is, it will not be possible to
call the function foo below without explicitly specifying template
arguments.
template <typename T> void foo (Vec<T>::type&);
So, the syntax is somewhat ugly. We would rather avoid the nested ::type
We’d prefer something lik...
Load “Vanilla” Javascript Libraries into Node.js
...o export.
So for a library like the file ./lib/mylibrary.js...
function Foo() { //Do something... }
biz = "Blah blah";
var bar = {'baz':'filler'};
When you want to use its functionality in your Node.js code...
var vanilla = require('vanilla');
var mylibrary = vanilla.require('./lib/mylibrary.j...
Join strings with a delimiter only if strings are not null or empty
...
Consider
var address = "foo";
var city;
var state = "bar";
var zip;
text = [address, city, state, zip].filter(Boolean).join(", ");
console.log(text)
.filter(Boolean) (which is the same as .filter(x => x)) removes all "falsy" values ...
PHP Fatal error: Cannot redeclare class
...
It means you've already created a class.
For instance:
class Foo {}
// some code here
class Foo {}
That second Foo would throw the error.
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Mercurial (hg) commit only certain files
...u can specify the files on the command line, as tonfa writes:
$ hg commit foo.c foo.h dir/
That just works and that's what I do all the time. You can also use the --include flag that you've found, and you can use it several times like this:
$ hg commit -I foo.c -I "**/*.h"
You can even use a f...
C# 4 default parameter values: How to assign a default DateTime/object value? [duplicate]
... you can't fake it with attributes.
.method private hidebysig static void foo([opt] int32 x) cil managed
{
.param [1] = int32(5)
.maxstack 8
L_0000: nop
L_0001: ret
}
.method //this is a new method
private hidebysig static //it is private, ???, and static
void foo //it returns...
How to shuffle a std::vector?
...random_engine e(seed);
while(true)
{
std::vector<int> foo{1,2,3,4,5};
std::shuffle(foo.begin(), foo.end(), e);
std::cout << "shuffled elements:";
for (int& x: foo) std::cout << ' ' << x;
std::cout << '\n';
}
return 0...
Append values to a set in Python
...set, it should be added with .add(), not .update().
Say you have a string foo_str whose contents are 'this is a sentence', and you have some set bar_set equal to set().
If you do
bar_set.update(foo_str), the contents of your set will be {'t', 'a', ' ', 'e', 's', 'n', 'h', 'c', 'i'}.
If you do bar...
How is the “greater than” or “>” character used in CSS?
...t would match the following <em>s:
<p><strong><em>foo</em></strong></p>
<p>Text <em>foo</em> bar</p>
On the other hand,
p > em
Will match only <em>s that are immediate children of <p>. So it will match:
<p&g...
How to create a file in Ruby
...ile.
If the text to be output is a string, rather than write:
File.open('foo.txt', 'w') { |fo| fo.puts "bar" }
or worse:
fo = File.open('foo.txt', 'w')
fo.puts "bar"
fo.close
Use the more succinct write:
File.write('foo.txt', 'bar')
write has modes allowed so we can use 'w', 'a', 'r+' if n...