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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...
Is there a way to simulate the C++ 'friend' concept in Java?
I would like to be able to write a Java class in one package which can access non-public methods of a class in another package without having to make it a subclass of the other class. Is this possible?
...
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 do you create optional arguments in php?
...le or a function call.
If you need this functionality however:
function foo($foo, $bar = false)
{
if(!$bar)
{
$bar = $foo;
}
}
Assuming $bar isn't expected to be a boolean of course.
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Creating PHP class instance with a string
...s();
When using namespaces, supply the fully qualified name:
$class = '\Foo\Bar\MyClass';
$instance = new $class();
Other cool stuff you can do in php are:
Variable variables:
$personCount = 123;
$varname = 'personCount';
echo $$varname; // echo's 123
And variable functions & methods.
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Remove whitespaces inside a string in javascript
...
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Disable assertions in Python
...time, ideally with some sort of context manager: assertion is evaluated: foo() and switching assertions off: with skip_assertion(): foo(). The benefit of this being that i dont have to add another flag on the function
– Matthijs
Sep 4 '19 at 21:42
...
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...
Is it possible to pass a flag to Gulp to have it run tasks in different ways?
...fore will fail, the next argument-value is what we get.
> gulp watch --foo --bar 1337 -boom "Foo isn't equal to bar."
getArg("--foo") // => true
getArg("--bar") // => "1337"
getArg("-boom") // => "Foo isn't equal to bar."
getArg("--404") // => null
Ok, enough for now... Here's a s...