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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
...
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...
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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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...
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!...
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
...
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...
Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
...rame #00 pc 0000841e /data/local/ndk-tests/crasher : Routine zoo in /tmp/foo/crasher/jni/zoo.c:13
Stack frame #01 pc 000083fe /data/local/ndk-tests/crasher : Routine bar in /tmp/foo/crasher/jni/bar.c:5
Stack frame #02 pc 000083f6 /data/local/ndk-tests/crasher : Routine my_comparison in /tm...
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) {...