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What is the type of lambda when deduced with “auto” in C++11?
...o a functor. Anything inside the [] are turned into constructor parameters and members of the functor object, and the parameters inside () are turned into parameters for the functor's operator().
A lambda which captures no variables (nothing inside the []'s) can be converted into a function pointer...
Creating JS object with Object.create(null)?
...= Object.prototype while Object.create(null) doesn't inherit from anything and thus has no properties at all.
In other words: A javascript object inherits from Object by default, unless you explicitly create it with null as its prototype, like: Object.create(null).
{} would instead be equivalent t...
Check if list contains any of another list
... performing on larger collections would be to project parameters to source and then use Intersect which internally uses a HashSet<T> so instead of O(n^2) for the first approach (the equivalent of two nested loops) you can do the check in O(n) :
bool hasMatch = parameters.Select(x => x.sour...
How to use the “required” attribute with a “radio” input field
...ll have the same name value. This allows only one to be selected at a time and applies required to the whole group.
<form>
Select Gender:<br>
<label>
<input type="radio" name="gender" value="male" required>
Male
</label><br>
<labe...
PostgreSQL: Can you create an index in the CREATE TABLE definition?
...BLE syntax. PostgreSQL does however create an index for unique constraints and primary keys by default, as described in this note:
PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness.
Other than that, if you want a non-unique in...
Convert file: Uri to File in Android
What's the easiest way to convert from a file: android.net.Uri to a File in Android?
18 Answers
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UITableView + Add content offset at top
...orInsets:[self.tableView contentInset]];
– David Hernandez
Sep 5 '14 at 16:28
add a comment
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Django Admin - change header 'Django administration' text
... original base_site.html, except putting in your custom title:
{% block branding %}
<h1 id="site-name">{% trans 'my cool admin console' %}</h1>
{% endblock %}
For this to work, you need to have the correct settings for your project, namely in settings.py:
Make sure /projectdir/templ...
How to empty/destroy a session in rails?
...668
Resets the session by clearing out all
the objects stored within and
initializing a new session object.
Good luck!
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PHP/MySQL insert row then get 'id'
...eld of my table auto increases when I insert a row. I want to insert a row and then get that ID.
10 Answers
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