Conversion

//Copyright (C) Microsoft Corporation. All rights reserved.

// conversion.cs
using System;

struct RomanNumeral
{
public RomanNumeral(int value)
{
this.value = value;
}
// Declare a conversion from an int to a RomanNumeral. Note the
// the use of the operator keyword. This is a conversion
// operator named RomanNumeral:
static public implicit operator RomanNumeral(int value)
{
// Note that because RomanNumeral is declared as a struct,
// calling new on the struct merely calls the constructor
// rather than allocating an object on the heap:
return new RomanNumeral(value);
}
// Declare an explicit conversion from a RomanNumeral to an int:
static public explicit operator int(RomanNumeral roman)
{
return roman.value;
}
// Declare an implicit conversion from a RomanNumeral to
// a string:
static public implicit operator string(RomanNumeral roman)
{
return("Conversion not yet implemented");
}
private int value;
}

class Test
{
static public void Main()
{
RomanNumeral numeral;

numeral = 10;

// Call the explicit conversion from numeral to int. Because it is
// an explicit conversion, a cast must be used:
Console.WriteLine((int)numeral);

// Call the implicit conversion to string. Because there is no
// cast, the implicit conversion to string is the only
// conversion that is considered:
Console.WriteLine(numeral);

// Call the explicit conversion from numeral to int and
// then the explicit conversion from int to short:
short s = (short)numeral;

Console.WriteLine(s);
}
}

---

// structconversion.cs
using System;

struct RomanNumeral
{
public RomanNumeral(int value)
{
this.value = value;
}
static public implicit operator RomanNumeral(int value)
{
return new RomanNumeral(value);
}
static public implicit operator RomanNumeral(BinaryNumeral binary)
{
return new RomanNumeral((int)binary);
}
static public explicit operator int(RomanNumeral roman)
{
return roman.value;
}
static public implicit operator string(RomanNumeral roman)
{
return("Conversion not yet implemented");
}
private int value;
}

struct BinaryNumeral
{
public BinaryNumeral(int value)
{
this.value = value;
}
static public implicit operator BinaryNumeral(int value)
{
return new BinaryNumeral(value);
}
static public implicit operator string(BinaryNumeral binary)
{
return("Conversion not yet implemented");
}
static public explicit operator int(BinaryNumeral binary)
{
return(binary.value);
}

private int value;
}

class Test
{
static public void Main()
{
RomanNumeral roman;
roman = 10;
BinaryNumeral binary;
// Perform a conversion from a RomanNumeral to a
// BinaryNumeral:
binary = (BinaryNumeral)(int)roman;
// Performs a conversion from a BinaryNumeral to a RomanNumeral.
// No cast is required:
roman = binary;
Console.WriteLine((int)binary);
Console.WriteLine(binary);
}
}