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Why does an overridden function in the derived class hide other overloads of the base class?
...on results.
For example, let's say the base class B has a member function foo that takes a parameter of type void *, and all calls to foo(NULL) are resolved to B::foo(void *). Let's say there's no name hiding and this B::foo(void *) is visible in many different classes descending from B. However, l...
Calling a function of a module by using its name (a string)
...'s name in a Python program. For example, let's say that I have a module foo , and I have a string whose content is "bar" . What is the best way to call foo.bar() ?
...
How can I build XML in C#?
...r friend.
For an XDocument example:
Console.WriteLine(
new XElement("Foo",
new XAttribute("Bar", "some & value"),
new XElement("Nested", "data")));
Or the same with XmlDocument:
XmlDocument doc = new XmlDocument();
XmlElement el = (XmlElement)doc.AppendChild(doc.CreateEl...
Interpolating a string into a regex
...
Same as string insertion.
if goo =~ /#{Regexp.quote(foo)}/
#...
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Get class name of object as string in Swift
...e.self)
String from a type:
String(describing: self)
Example:
struct Foo {
// Instance Level
var typeName: String {
return String(describing: Foo.self)
}
// Instance Level - Alternative Way
var otherTypeName: String {
let thisType = type(of: self)
...
Dynamically set local variable [duplicate]
...u cannot modify locals() directly and expect it to work.
>>> def foo():
lcl = locals()
lcl['xyz'] = 42
print(xyz)
>>> foo()
Traceback (most recent call last):
File "<pyshell#6>", line 1, in <module>
foo()
File "<pyshell#5>", line 4, in foo
...
Use of 'const' for function parameters
... need to know anything on what you do (internally) with it. So write class Foo { int multiply(int a, int b) const; } in your header. In your implementation you do care that you can promise not to alter a and b so int Foo::multiply(const int a, const int b) const { } makes sense here. (Sidenote: both...
How can you use an object's property in a double-quoted string?
... in a double-quoted string it will be replaced by that variable's value:
$foo = 2
"$foo"
becomes
"2"
If you don't want that you have to use single quotes:
$foo = 2
'$foo'
However, if you want to access properties, or use indexes on variables in a double-quoted string, you have to enclose th...
Efficiently updating database using SQLAlchemy ORM
...n your session.
So if you say
for c in session.query(Stuff).all():
c.foo = c.foo+1
session.commit()
it will do what it says, go fetch all the objects from the database, modify all the objects and then when it's time to flush the changes to the database, update the rows one by one.
Instead y...
How to replace strings containing slashes with sed?
...not part of either string. Or, you could escape it with a backslash:
s/\//foo/
Which would replace / with foo. You'd want to use the escaped backslash in cases where you don't know what characters might occur in the replacement strings (if they are shell variables, for example).
...