forward-reference | 易学教程

How to handle forward references of XML IDREF with JAXB XmlAdapter during unmarshal?

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Is it possible to handle forward references of XML IDREF elements in JAXB XmlAdapter during the unmarshal process? For example, I have the following XML complexType : <xs:complexType name="person"> <xs:complexContent> <xs:sequence> <xs:element name="dateOfBirth" type="xs:dateTime" minOccurs="0"/> <xs:element name="firstName" type="xs:string" minOccurs="0"/> <xs:element name="gender" type="xs:string" minOccurs="0"/> <xs:element name="guardian" type="xs:IDREF" minOccurs="0"/> <xs:element name="homePhone" type="xs:string" minOccurs="0"/> <xs:element name="lastName" type="xs:string" minOccurs="0"/

What is forward reference in C?

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问题 What is forward reference in C with respect to pointers? Can I get an example? 回答1: See this page on forward references. I don't see how forward referencing would be different with pointers and with other PoD types. Note that you can forward declare types, and declare variables which are pointers to that type: struct MyStruct; struct MyStruct *ptr; struct MyStruct var; // ILLEGAL ptr->member; // ILLEGAL struct MyStruct { // ... }; // Or: typedef struct MyStruct MyStruct; MyStruct *ptr;

How to handle forward references of XML IDREF with JAXB XmlAdapter during unmarshal?

阅读更多关于 How to handle forward references of XML IDREF with JAXB XmlAdapter during unmarshal?

问题 Is it possible to handle forward references of XML IDREF elements in JAXB XmlAdapter during the unmarshal process? For example, I have the following XML complexType : <xs:complexType name="person"> <xs:complexContent> <xs:sequence> <xs:element name="dateOfBirth" type="xs:dateTime" minOccurs="0"/> <xs:element name="firstName" type="xs:string" minOccurs="0"/> <xs:element name="gender" type="xs:string" minOccurs="0"/> <xs:element name="guardian" type="xs:IDREF" minOccurs="0"/> <xs:element name=

Is there a generic way to memoize in Scala?

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I wanted to memoize this: def fib(n: Int) = if(n <= 1) 1 else fib(n-1) + fib(n-2) println(fib(100)) // times out So I wrote this and this surprisingly compiles and works (I am surprised because fib references itself in its declaration): case class Memo[A,B](f: A => B) extends (A => B) { private val cache = mutable.Map.empty[A, B] def apply(x: A) = cache getOrElseUpdate (x, f(x)) } val fib: Memo[Int, BigInt] = Memo { case 0 => 0 case 1 => 1 case n => fib(n-1) + fib(n-2) } println(fib(100)) // prints 100th fibonacci number instantly But when I try to declare fib inside of a def , I get a