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What is “rvalue reference for *this”?
...-member functions? Operator overloading, that's why. Consider this:
struct foo{
foo& operator<<(void*); // implementation unimportant
};
foo& operator<<(foo&, char const*); // implementation unimportant
You'd certainly want the following to call the free function, don't y...
Converting an object to a string
... This doesn't work if the object has a function property, eg: foo: function () {...}.
– Brock Adams
Sep 29 '12 at 14:54
...
How do I trim a file extension from a String in Java?
...ething that can be easily done with a single line.
– foo
Sep 3 '18 at 9:40
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When should I use @classmethod and when def method(self)?
...mation about the instance or class on which it was called.
In [6]: class Foo(object): some_static = staticmethod(lambda x: x+1)
In [7]: Foo.some_static(1)
Out[7]: 2
In [8]: Foo().some_static(1)
Out[8]: 2
In [9]: class Bar(Foo): some_static = staticmethod(lambda x: x*2)
In [10]: Bar.some_static...
Blocks and yields in Ruby
...rguments, if needed. Consider this example method that demonstrates:
def foo(x)
puts "OK: called as foo(#{x.inspect})"
yield("A gift from foo!") if block_given?
end
foo(10)
# OK: called as foo(10)
foo(123) {|y| puts "BLOCK: #{y} How nice =)"}
# OK: called as foo(123)
# BLOCK: A gift from foo!...
Difference between timestamps with/without time zone in PostgreSQL
...ime zone.
Here are examples covering the combinations of those factors:
foo=> SET TIMEZONE TO 'Japan';
SET
foo=> SELECT '2011-01-01 00:00:00'::TIMESTAMP;
timestamp
---------------------
2011-01-01 00:00:00
(1 row)
foo=> SELECT '2011-01-01 00:00:00'::TIMESTAMP WITH TIME ZONE...
Why use apparently meaningless do-while and if-else statements in macros?
...lon after the (void)0. A dangling else in that case (e.g. if (cond) if (1) foo() else (void)0 else { /* dangling else body */ }) triggers a compilation error. Here's a live example demonstrating it
– Chris Kline
Jul 27 '15 at 11:07
...
Pass entire form as data in jQuery Ajax function
...select> options are serialized under the same key, e.g.
<select id="foo" name="foo" multiple="multiple">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
</select>
will result in a query s...
Join vs. sub-query
...t-Fields
SELECT moo, (SELECT roger FROM wilco WHERE moo = me) AS bar FROM foo
Be aware that a sub-query is executed for every resulting row from foo.
Avoid this if possible; it may drastically slow down your query on huge datasets. However, if the sub-query has no reference to foo it can be optim...
Managing constructors with many parameters in Java
...ng house, String street, String town, String postcode, String country, int foo, double bar) {
super(String house, String street, String town, String postcode, String country);
this.foo = foo;
this.bar = bar;
then you could instead have:
MyClass(Address homeAddress, int foo, double bar) {...