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Why do we need virtual functions in C++?
...you overload func() so it takes a Cat*? If you have to derive more animals from Animal they would all need their own func().
The solution is to make eat() from the Animal class a virtual function:
class Animal
{
public:
virtual void eat() { std::cout << "I'm eating generic food."...
How do I correctly clean up a Python object?
... By the way, if you're using Python 2.5, you'll need to do from future import with_statement to be able to use the with statement.
– Clint Miller
May 14 '09 at 20:39
...
JavaScript: Passing parameters to a callback function
...e callback function
//only when we have some missing value
//get this data from ajax or compute
var extraParam = "this data was missing" ;
//call the callback when we have the data
callback(extraParam);
}
// test function
callbackTester (function(k) {
tryMe("hello", "goodbye", k);
});
...
Capture Video of Android's Screen
...een on my mac, then using my standard tools (SnapPro X) to capture a movie from that part of the screen. Not sure what the frame rate is on ashot, but I think higher than 1 fps.
– Fraggle
Nov 14 '13 at 16:35
...
Git keeps asking me for my ssh key passphrase
...-x Lock agent. -X Unlock agent. -s pkcs11 Add keys from PKCS#11 provider.
– Sandeep C
Feb 12 '17 at 10:35
...
Read and parse a Json File in C#
...you have a StreamReader anyway, it would be better to deserialize directly from the stream using JsonTextReader as shown in Can Json.NET serialize / deserialize to / from a stream?. The r.ReadToEnd() is not needed.
– dbc
Jun 11 '19 at 19:05
...
Add an element to an array in Swift
...
anArray+="Foo" does not work anymore from xCode 6 beta 5
– Amitay
Aug 7 '14 at 6:44
...
Using JSON.NET as the default JSON serializer in ASP.NET MVC 3 - is it possible?
... Be aware though, that this is not the default behavior for JSON responses from ASP.NET MVC, which rather responds with an empty string, when there's no data.
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What is the scope of variables in JavaScript?
...ation Styles
var
Identifiers declared using var have function scope, apart from when they are declared directly in the global context, in which case they are added as properties on the global object and have global scope. There are separate rules for their use in eval functions.
let and const
Identi...
Regular cast vs. static_cast vs. dynamic_cast [duplicate]
...ck would be unnecessary. Example:
void func(void *data) {
// Conversion from MyClass* -> void* is implicit
MyClass *c = static_cast<MyClass*>(data);
...
}
int main() {
MyClass c;
start_thread(&func, &c) // func(&c) will be called
.join();
}
In this example, ...