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In C++, what is a virtual base class?
...ple inheritance.
Consider the following scenario:
class A { public: void Foo() {} };
class B : public A {};
class C : public A {};
class D : public B, public C {};
The above class hierarchy results in the "dreaded diamond" which looks like this:
A
/ \
B C
\ /
D
An instance of D will b...
Get next / previous element using JavaScript?
...
use the nextSibling and previousSibling properties:
<div id="foo1"></div>
<div id="foo2"></div>
<div id="foo3"></div>
document.getElementById('foo2').nextSibling; // #foo3
document.getElementById('foo2').previousSibling; // #foo1
However in some brow...
How to Remove Array Element and Then Re-Index Array?
...
unset($foo[0]); // remove item at index 0
$foo2 = array_values($foo); // 'reindex' array
share
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improve this answer
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...
Reload django object from database
... merge
self.__dict__.update(new_self.__dict__)
# Use it like this
bar.foo = foo
assert bar.foo.pk is None
foo.save()
foo.reload()
assert bar.foo is foo and bar.foo.pk is not None
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impro...
Bulk insert with SQLAlchemy ORM
...ry keys), and bulk inserts interfere with that. For example, assuming your foo table contains an id column and is mapped to a Foo class:
x = Foo(bar=1)
print x.id
# None
session.add(x)
session.flush()
# BEGIN
# INSERT INTO foo (bar) VALUES(1)
# COMMIT
print x.id
# 1
Since SQLAlchemy picked up the...
Comparison of C++ unit test frameworks [closed]
...nd non-fatal assertions
Easy assertions informative messages: ASSERT_EQ(5, Foo(i)) << " where i = " << i;
Google Test automatically detects your tests and doesn't require you to enumerate them in order to run them
Make it easy to extend your assertion vocabulary
Death tests (see advanced...
Using “super” in C++
...ll the desired function.
For example:
class Base
{
public: virtual void foo() { ... }
};
class Derived: public Base
{
public:
typedef Base super;
virtual void foo()
{
super::foo(); // call superclass implementation
// do other stuff
...
}
};
class Deri...
C# 4.0 optional out/ref arguments
...pe Result { get; set; }
}
Then you can use it as follows:
public string foo(string value, OptionalOut<int> outResult = null)
{
// .. do something
if (outResult != null) {
outResult.Result = 100;
}
return value;
}
public void bar ()
{
string str = "bar";
s...
How to perform case-insensitive sorting in JavaScript?
...
In (almost :) a one-liner
["Foo", "bar"].sort(function (a, b) {
return a.toLowerCase().localeCompare(b.toLowerCase());
});
Which results in
[ 'bar', 'Foo' ]
While
["Foo", "bar"].sort();
results in
[ 'Foo', 'bar' ]
...
Is there a “goto” statement in bash?
...bitrary loops, most require that to be expressed statically -- e.g., break foo; will break out of the loop labeled foo -- whereas in Bash it's expressed dynamically -- e.g., break "$foo" will break out of $foo loops.)
– ruakh
Apr 28 '14 at 16:37
...