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What's the difference between dynamic (C# 4) and var?
...l that happened was that the compiler figured out that s must be a string (from the initializer). In both cases, it knows (in the IL) that s.Length means the (instance) string.Length property.
dynamic is a very different beast; it is most similar to object, but with dynamic dispatch:
dynamic s = "...
Officially, what is typename for?
...
Following is the quote from Josuttis book:
The keyword typename was introduced to
specify that the identifier that
follows is a type. Consider the
following example:
template <class T>
Class MyClass
{
typename T::SubType * ptr;
...
PUT vs. POST in REST
...stomer” resource with a
different mailing address field value.
taken from REST API Design - Resource Modeling by Prakash Subramaniam of Thoughtworks
This forces the API to avoid state transition problems with multiple clients updating a single resource, and matches more nicely with event sour...
Apple Pay入华遇阻 只因BAT太受欢迎？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...岁末，移动支付领域越发的不平静。苹果Apple Pay确认在2016年二月份进军中国移动支付市场，三星则传出在中国招募人员测试SamsungPay，将于2016年第一季度进入中国的消息。与此同时，国内移动支付三巨头也动作频频，李彦宏宣布...
Can a variable number of arguments be passed to a function?
...
460
Yes. You can use *args as a non-keyword argument. You will then be able to pass any number of ar...
How can I control the width of a label tag?
...
190
Using CSS, of course...
label { display: block; width: 100px; }
The width attribute is deprec...
Why are you not able to declare a class as static in Java?
...'t need any instance of anything to refer to them. They can be referred to from anywhere. They're in static storage (as in C storage classes). - As others have noted (Iain Elder in a comment to another answer), the language designers could have allowed the static keyword on a top-level class to deno...
How to reference constants in EL?
...
EL 3.0 or newer
If you're already on Java EE 7 / EL 3.0, then the @page import will also import class constants in EL scope.
<%@ page import="com.example.YourConstants" %>
This will under the covers be imported via Impor...
How to make a Java class that implements one interface with two generic types?
.... The need for Consumer<Tomato>, Consumer<Apple> objects comes from other methods that expect these as parameters. I need one class the implement them both in order to share state.
Steve's idea was to use two inner classes, each implementing a different generic type.
This version add...
Why should I learn Lisp? [closed]
...gram that simulated Abbott and Costello's "Who's on First" routine. Input from the user was matched against some pretty complicated data structures (resembling maps in other languages, but much more flexible) to choose what an appropriate response would be. I also wrote a routine to solve a 3x3 sl...