大约有 40,800 项符合查询结果（耗时：0.0378秒） [XML]
Getting activity from context in android
This one has me stumped.
11 Answers
11
...
Why do we need virtual functions in C++?
...
Here is how I understood not just what virtual functions are, but why they're required:
Let's say you have these two classes:
class Animal
{
public:
void eat() { std::cout << "I'm eating generic food."; }
};
c...
What is exactly the base pointer and stack pointer? To what do they point?
Using this example coming from wikipedia, in which DrawSquare() calls DrawLine(),
8 Answers
...
Why does PHP 5.2+ disallow abstract static class methods?
...riding the superclass's static method
EDIT (Sept. 16th, 2009)
Update on this. Running PHP 5.3, I see abstract static is back, for good or ill. (see http://php.net/lsb for more info)
CORRECTION (by philfreo)
abstract static is still not allowed in PHP 5.3, LSB is related but different.
...
Max or Default?
What is the best way to get the Max value from a LINQ query that may return no rows? If I just do
17 Answers
...
What does “O(1) access time” mean?
I have seen this term "O(1) access time" used to mean "quickly" but I don't understand what it means. The other term that I see with it in the same context is "O(n) access time". Could someone please explain in a simple way what these terms mean?
...
What is the usefulness of `enable_shared_from_this`?
I ran across enable_shared_from_this while reading the Boost.Asio examples and after reading the documentation I am still lost for how this should correctly be used. Can someone please give me an example and explanation of when using this class makes sense.
...
What is thread safe or non-thread safe in PHP?
...or handling incoming HTTP requests in parallel. A pretty popular technique is using threads -- that is, the web server will create/dedicate a single thread for each incoming request. The Apache HTTP web server supports multiple models for handling requests, one of which (called the worker MPM) uses ...
Is there a foreach loop in Go?
Is there a foreach construct in the Go language? Can I iterate over a slice or array using a for ?
8 Answers
...
F# changes to OCaml [closed]
F# is derived from OCaml, but what major items are missing or added? Specifically I'm curious as to whether the resources available for learning OCaml are also useful to someone who wants to learn F#.
...