大约有 16,000 项符合查询结果（耗时：0.0527秒） [XML]
Why is exception handling bad?
... possibly corrupted object.
This example may seem stupid (ok, I had to stretch myself a bit to construct one :-)), but, the takeaway is that if a programmer isn't constantly thinking of exceptions, and making sure that every permutation of state gets rolled back whenever there are throws, you get i...
How should I have explained the difference between an Interface and an Abstract class?
...yment class. Payment can be made in many ways, such as PayPal, credit card etc. So we normally take Payment as our interface which contains a makePayment() method and CreditCard and PayPal are the two implementation classes.
public interface Payment
{
void makePayment();//by default it is a abs...
Where to use EJB 3.1 and CDI?
... to the container who will send the call through interceptors, decorators, etc. as well as take care of any transaction or security checks. Once all that is done, the call finally goes to the real object and the result is passed back through the proxy to the caller.
The difference only comes in ho...
Why are mutable structs “evil”?
...w and then - especially with your Business Model, where you want streaming etc. to work smoothly with existing solutions. I wrote an article on how to work with mutable AND immutable data, solving most issues around mutability (I hope): rickyhelgesson.wordpress.com/2012/07/17/…
...
How to set a Default Route (To an Area) in MVC
...or the simple purpose of switching your view engine (i.e. to Spark, NHaml, etc.). In this case, it's not the View-creation logic we need to override, but the FindPartialView and FindView methods in the VirtualPathProviderViewEngine class.
You can thank your lucky stars that these methods are in fac...
Programmer Puzzle: Encoding a chess board state throughout a game
...We could simply store the the text of the move here (“e4”, “Bxb5”, etc). Including a terminating byte you’re looking at about 6 bytes (48 bits) per move (worst case). That’s not particularly efficient.
The second thing to try is to store the starting location (6 bits) and end location (...
How can I view the source code for a function?
..., what type(s) of objects its return type is, whether and how it recurses, etc.
To redirect to a separate file (so you can bring up the code in your favorite IDE/editor/process it with grep/etc.):
capture.output(getAnywhere('rfcv'), file='source_rfcv.r')
...
How can I make setuptools install a package that's not on PyPI?
...an old one. The Github source is setuptools-compatible, i.e. has setup.py, etc. Is there a way to make setuptools download and install the new version instead of looking for it on PyPI and installing the old one?
...
When do I use a dot, arrow, or double colon to refer to members of a class in C++?
...ect a. So, primarily, a is an object and b is a member (function/ variable etc) of a.
Arrow operator is used in indirect member selection scenarios.
print(a->b)
Here, we are accessing b which is a member of the object, that is pointed to by a. It is shorthand of (*a).b and so here, a is pr...
What is the performance cost of having a virtual method in a C++ class?
...predicted. This can cause a large pipeline bubble as the processor cannot fetch any instructions until the indirect jump (the call through the function pointer) has retired and a new instruction pointer computed. So, the cost of a virtual function call is much bigger than it might seem from looking ...