define derived trait

  // Class interface, but the method can be implemented // multiple inheritance trait traita {Val tnum: int def log (MSG: string): unit = {println ("log: "+ MSG) }} trait traitb extends traita {def test: unit = {log (" trait TB call ") }} trait

Traits Many of my PHP developer friends are not familiar with traits, which is a new concept introduced in PHP 5.4.0. Traits looks like an interface but uses it like a class, what exactly is it? Neither of them is. A trait has partial

PhpMagic VariablePHP provides a large number of predefined constants to any script it runs.However, many constants are defined by different extensions, and are only present when the extensions are loaded, either dynamically after loading, or they

Before I read "effective C + +", I wrote the reading notes for each article, which was the previous version of C++11. Here I have a summary of each of the terms that impresses me a little bit.1. C + + includes: Plain C (process-oriented), OOP

"Editor's note" Although Java has won a lot of developers love, but compared to other modern programming languages, its syntax is indeed slightly lengthy. But with Java8, you can write code that is both readable and concise by using lambda

C + + has one more type than C to do except for a variety of class types: references. This variable is not like a variable, the pointer is not like a pointer, I did not understand it before, look at the program encountered a reference is a blur of

SkillsMost of the content in this book is a programming guideline. Although these guidelines are important, programmers cannot live by the rules alone. There is a long-time cartoon called "Philip Cat" (Felix the Cat), Philip Cat whenever encountered

Catalogue [-] 1. Types of inheritance in ODB 2. The difference between abstract and polymorphic 3.polymorphic table 4. How the previous version implemented polymorphic 5. Example This section focuses on the relationship

Object-oriented design has a point that everyone has basically formed a consensus, that is, interface programming, I think most people on this is nothing to suspect. The question is how we embody it in the actual project development. Does it mean

First-class functionsScala's functions are the first-class functions (first-class function). Not only can you define and invoke functions, you can also write them as anonymous literals (literal) and pass them as values.The function literal is