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Callback functions in C++
...rguably the worst) type a callback can have.
Let's have a simple function foo:
int foo (int x) { return 2+x; }
1.1 Writing a function pointer / type notation
A function pointer type has the notation
return_type (*)(parameter_type_1, parameter_type_2, parameter_type_3)
// i.e. a pointer to foo...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
...ay.
The fundamental reason why all of these work is that a function (like foo) is implicitly convertible to a pointer to the function. This is why void (*p1_foo)() = foo; works: foo is implicitly converted into a pointer to itself and that pointer is assigned to p1_foo.
The unary &, when app...
Calling C/C++ from Python?
...e you have a simple C++ example class you want to talk to in a file called foo.cpp:
#include <iostream>
class Foo{
public:
void bar(){
std::cout << "Hello" << std::endl;
}
};
Since ctypes can only talk to C functions, you need to provide those de...
Extending from two classes
...aven't really gone into how. Hopefully this will help.
Say you have class Foo and class Bar that you both want to try extending into a class FooBar. Of course, as you said, you can't do:
public class FooBar extends Foo, Bar
People have gone into the reasons for this to some extent already. Inste...
Using Mockito to mock classes with generic parameters
...d of mocking a class with generic parameters? Say I have to mock a class Foo<T> which I need to pass into a method that expects a Foo<Bar> . I can do the following easily enough:
...
JavaScript REST client Library [closed]
... basic auth
var client = new $.RestClient('/api/rest/');
client.add('foo');
client.foo.add('baz');
client.add('bar');
client.foo.create({a:21,b:42});
// POST /api/rest/foo/ (with data a=21 and b=42)
client.foo.read();
// GET /api/rest/foo/
client.foo.read("42");
// GET /api/re...
Type Checking: typeof, GetType, or is?
...cally a whole bunch of methods with the appropriate type. Example:
string Foo<T>(T parameter) { return typeof(T).Name; }
Animal probably_a_dog = new Dog();
Dog definitely_a_dog = new Dog();
Foo(probably_a_dog); // this calls Foo<Animal> and returns "Animal"
Foo<Animal>(probab...
What are the differences between double-dot “..” and triple-dot “…” in Git diff commit ranges?
...ve the following meanings:
# Left side in the illustration below:
git diff foo..bar
git diff foo bar # same thing as above
# Right side in the illustration below:
git diff foo...bar
git diff $(git merge-base foo bar) bar # same thing as above
In other words, git diff foo..bar is exactly the sam...
How can I get the source code of a Python function?
... is from a source file available on the filesystem, then inspect.getsource(foo) might be of help:
If foo is defined as:
def foo(arg1,arg2):
#do something with args
a = arg1 + arg2
return a
Then:
import inspect
lines = inspect.getsource(foo)
print(lines)
...
Should I make HTML Anchors with 'name' or 'id'?
...ne wants to refer to some part of a webpage with the " http://example.com/#foo " method, should one use
14 Answers
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