Ray's playground

摘要： HowEasyCode highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--1#include<string>2#include<sstream>3#include<algorithm>4usingnamespacestd;56c... 阅读全文

摘要： codeCode highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--1#import“Fraction.h”2@interfaceFraction(MathOps)3-(Fraction*)add:(Fraction*)f;4-(Fract... 阅读全文

摘要： You can put four directives in front of your instance variables when they are declaredin the interface section, to more precisely control their scope:　　@protected—Methods defined in the class an... 阅读全文

摘要： To generate one of the so-called selectors listed in Table 9.1, you apply the @selectordirective to a method name. For example, the following produces a value of type SEL forthe method named alloc, wh... 阅读全文

摘要： Using the @class directive is more efficient because the compiler doesn’t need toprocess the entire XYPoint.h file (even though it is quite small); it just needs to know thatXYPoint is the name ... 阅读全文

摘要： In general, if you have an instance variable called x, including the following line inyour implementation section causes the compiler to automatically synthesize a gettermethod called x and a setter m... 阅读全文

摘要： This is because the conditionaloperator associates from right to left, meaning that multiple uses of this operatorin a single expression, such as in　　e1 ? e2 : e3 ? e4 : e5　　group from right to left a... 阅读全文

摘要： Sharding refers to the process of splitting data up and storing different portions of thedata on different machines; the term partitioning is also sometimes used to describethis concept. By splitting ... 阅读全文

摘要： The id data type is used to store an object of any type. In a sense, it is a generic objecttype. For example, this line declares number to be a variable of type id:　　id number;　　Methods can be declare... 阅读全文

摘要： The leading minus sign (-) tells the Objective-C compiler that the method is an instancemethod.The only other option is a plus sign (+), which indicates a class method. 阅读全文