C# Language Specification - Willy .Net

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<strong>C#</strong> LANGUAGE SPECIFICATION18.4.1 Database integer typeThe DBInt struct below implements an integer type that can represent the complete set of values of the inttype, plus an additional state that indicates an unknown value. A type with these characteristics is commonlyused in databases.using System;public struct DBInt{// The Null member represents an unknown DBInt value.public static readonly DBInt Null = new DBInt();// When the defined field is true, this DBInt represents a// known value which is stored in the value field. When// the defined field is false, this DBInt represents an// unknown value, and the value field is 0.int value;bool defined;// Private instance constructor. Creates a DBInt with a known value.DBInt(int value) {this.value = value;this.defined = true;}// The IsNull property is true if this DBInt represents an unknown// value.public bool IsNull { get { return !defined; } }// The Value property is the known value of this DBInt, or 0 if this// DBInt represents an unknown value.public int Value { get { return value; } }// Implicit conversion from int to DBInt.public static implicit operator DBInt(int x) {return new DBInt(x);}// Explicit conversion from DBInt to int. Throws an exception if the// given DBInt represents an unknown value.public static explicit operator int(DBInt x) {if (!x.defined) throw new InvalidOperationException();return x.value;}public static DBInt operator +(DBInt x) {return x;}public static DBInt operator -(DBInt x) {return x.defined? -x.value: Null;}public static DBInt operator +(DBInt x, DBInt y) {return x.defined && y.defined? x.value + y.value: Null;}public static DBInt operator -(DBInt x, DBInt y) {return x.defined && y.defined? x.value - y.value: Null;}public static DBInt operator *(DBInt x, DBInt y) {return x.defined && y.defined? x.value * y.value: Null;}public static DBInt operator /(DBInt x, DBInt y) {return x.defined && y.defined? x.value / y.value: Null;}272
Chapter 18 Structs}public static DBInt operator %(DBInt x, DBInt y) {return x.defined && y.defined? x.value % y.value: Null;}public static DBBool operator ==(DBInt x, DBInt y) {return x.defined && y.defined? x.value == y.value: DBBool.Null;}public static DBBool operator !=(DBInt x, DBInt y) {return x.defined && y.defined? x.value != y.value: DBBool.Null;}public static DBBool operator >(DBInt x, DBInt y) {return x.defined && y.defined? x.value > y.value: DBBool.Null;}public static DBBool operator =(DBInt x, DBInt y) {return x.defined && y.defined? x.value >= y.value: DBBool.Null;}public static DBBool operator
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Standard ECMA-3342nd edition - Dece
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Brief historyThis International Sta
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C# LANGUAGE SPECIFICATION9.3.3 Whit
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Table of Contents18.3.5 Boxing and
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Table of ContentsA.2.12 Attributes.
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Chapter 1 Scope1. ScopeThis clause
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C# LANGUAGE SPECIFICATIONA conformi
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Chapter 4 Definitions4. Definitions
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Chapter 5 Notational conventions5.
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Chapter 7 General description7. Gen
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Chapter 9 Lexical structure9. Lexic
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