unsafe public static void Main()
{
Console.WriteLine($"Size of CurrencyStruct struct is {sizeof(CurrencyStruct)}");
CurrencyStruct amount1 = new(10, 10), amount2 = new(20, 20);
CurrencyStruct *pAmount = &amount1;
long * pDollars = &(pAmount->Dollars);
byte * pCents = &(pAmount->Cents);
Console.WriteLine($"Address of amount1 is 0x{(ulong)&amount1:X}");
Console.WriteLine($"Address of amount2 is 0x{(ulong)&amount2:X}");
Console.WriteLine($"Address of pAmount is 0x{(ulong)&pAmount:X}");
Console.WriteLine($"Value of pAmount is 0x{(ulong)pAmount:X}");
Console.WriteLine($"Address of pDollars is 0x{(ulong)&pDollars:X}");
Console.WriteLine($"Value of pDollars is 0x{(ulong)pDollars:X}");
Console.WriteLine($"Address of pCents is 0x{(ulong)&pCents:X}");
Console.WriteLine($"Value of pCents is 0x{(ulong)pCents:X}");
// because Dollars are declared readonly in CurrencyStruct, you cannot change it with a variable of type CurrencyStruct
// pAmount->Dollars = 20;
// but you can change it via a pointer referencing the memory address!
*pDollars = 100;
Console.WriteLine($"amount1 contains {amount1}");
--pAmount; // this should get it to point to amount2
Console.WriteLine($"pAmount contains the new address {(ulong)pAmount:X} " +
$"and references this value {*pAmount}");
// do some clever casting to get pCents to point to cents
// inside amount2
CurrencyStruct *pTempCurrency = (CurrencyStruct *)pCents;
pCents = (byte *)(--pTempCurrency);
Console.WriteLine($"Value of pCents is now 0x{(ulong)pCents:X}");
Console.WriteLine($"The value where pCents points to: {*pCents}");
Console.WriteLine("\nNow with classes");
// now try it out with classes
CurrencyClass amount3 = new(30, 0);
fixed(long *pDollars2 = &(amount3.Dollars))
fixed(byte *pCents2 = &(amount3.Cents))
{
Console.WriteLine($"amount3.Dollars has address 0x{(ulong)pDollars2:X}");
Console.WriteLine($"amount3.Cents has address 0x{(ulong)pCents2:X}");
*pDollars2 = -100;
Console.WriteLine($"amount3 contains {amount3}");
}
// use a function pointer
FunctionPointerSample.Calc(&Add);
FunctionPointerSample.Calc(&Subtract);
}
unsafe public static void Main()
{
Console.WriteLine($"Size of CurrencyStruct struct is {sizeof(CurrencyStruct)}");
CurrencyStruct amount1, amount2;
CurrencyStruct *pAmount = &amount1;
long * pDollars = &(pAmount->Dollars);
byte * pCents = &(pAmount->Cents);
Console.WriteLine($"Address of amount1 is 0x{(ulong)&amount1:X}");
Console.WriteLine($"Address of amount2 is 0x{(ulong)&amount2:X}");
Console.WriteLine($"Address of pAmount is 0x{(ulong)&pAmount:X}");
Console.WriteLine($"Address of pDollars is 0x{(ulong)&pDollars:X}");
Console.WriteLine($"Address of pCents is 0x{(ulong)&pCents:X}");
pAmount->Dollars = 20;
*pCents = 50;
Console.WriteLine($"amount1 contains {amount1}");
--pAmount; // this should get it to point to amount2
Console.WriteLine($"amount2 has address 0x{(ulong)pAmount:X} " +
$"and contains {*pAmount}");
// do some clever casting to get pCents to point to cents
// inside amount2
CurrencyStruct *pTempCurrency = (CurrencyStruct *)pCents;
pCents = (byte *)(--pTempCurrency);
Console.WriteLine("Address of pCents is now 0x{0:X}", (ulong)&pCents);
Console.WriteLine("\nNow with classes");
// now try it out with classes
var amount3 = new CurrencyClass();
fixed(long *pDollars2 = &(amount3.Dollars))
fixed(byte *pCents2 = &(amount3.Cents))
{
Console.WriteLine($"amount3.Dollars has address 0x{(ulong)pDollars2:X}");
Console.WriteLine($"amount3.Cents has address 0x{(ulong)pCents2:X}");
*pDollars2 = -100;
*pCents2 = 2;
Console.WriteLine($"amount3 contains {amount3}");
var d = &pDollars2;
//&pCents2;
Console.WriteLine($"amount3.Dollars has address 0x{(ulong)pDollars2:X}");
Console.WriteLine($"amount3.Cents has address 0x{(ulong)pCents2:X}");
}
}
private static unsafe void Main()
{
Console.WriteLine("Size of Currency struct is " + sizeof(CurrencyStruct));
CurrencyStruct amount1, amount2;
CurrencyStruct *pAmount = &amount1;
long * pDollars = &(pAmount->Dollars);
byte * pCents = &(pAmount->Cents);
Console.WriteLine("Address of amount1 is 0x{0:X}", (uint)&amount1);
Console.WriteLine("Address of amount2 is 0x{0:X}", (uint)&amount2);
Console.WriteLine("Address of pAmt is 0x{0:X}", (uint)&pAmount);
Console.WriteLine("Address of pDollars is 0x{0:X}", (uint)&pDollars);
Console.WriteLine("Address of pCents is 0x{0:X}", (uint)&pCents);
pAmount->Dollars = 20;
*pCents = 50;
Console.WriteLine("amount1 contains " + amount1);
--pAmount; // this should get it to point to amount2
Console.WriteLine("amount2 has address 0x{0:X} and contains {1}",
(uint)pAmount, *pAmount);
// do some clever casting to get pCents to point to cents
// inside amount2
CurrencyStruct *pTempCurrency = (CurrencyStruct *)pCents;
pCents = (byte *)(--pTempCurrency);
Console.WriteLine("Address of pCents is now 0x{0:X}", (uint)&pCents);
Console.WriteLine("\nNow with classes");
// now try it out with classes
CurrencyClass amount3 = new CurrencyClass();
fixed(long *pDollars2 = &(amount3.Dollars))
fixed(byte *pCents2 = &(amount3.Cents))
{
Console.WriteLine("amount3.Dollars has address 0x{0:X}", (uint)pDollars2);
Console.WriteLine("amount3.Cents has address 0x{0:X}", (uint)pCents2);
*pDollars2 = -100;
Console.WriteLine("amount3 contains " + amount3);
}
Console.ReadLine();
}
private static unsafe void Main()
{
Console.WriteLine("Size of Currency struct is {0}", sizeof(CurrencyStruct));
CurrencyStruct amount1, amount2;
CurrencyStruct *pAmount = &amount1;
long * pDollars = &(pAmount->Dollars);
byte * pCents = &(pAmount->Cents);
Console.WriteLine("Address of amount1 is 0x{0:X}", (uint)&amount1);
Console.WriteLine("Address of amount2 is 0x{0:X}", (uint)&amount2);
Console.WriteLine("Address of pAmt is 0x{0:X}", (uint)&pAmount);
Console.WriteLine("Address of pDollars is 0x{0:X}", (uint)&pDollars);
Console.WriteLine("Address of pCents is 0x{0:X}", (uint)&pCents);
pAmount->Dollars = 20;
*pCents = 50;
Console.WriteLine("amount1 contains {0}", amount1);
--pAmount; // Note: это должно переустановить указатель на amount2
Console.WriteLine("amount2 has address 0x{0:X} and contains {1}", (uint)pAmount, *pAmount);
// Note: Выполнить некоторое интеллектуальное приведение, чтобы установить
// указатель pCents на значение центов внутри amount2
var pTempCurrency = (CurrencyStruct *)pCents;
pCents = (byte *)(--pTempCurrency);
Console.WriteLine("Address of pCents is now 0x{0:X}", (uint)&pCents);
Console.WriteLine("\nNow with classes");
// Пробуем указатели с классами
var amount3 = new CurrencyClass();
fixed(long *pDollars2 = &(amount3.Dollars))
fixed(byte *pCents2 = &(amount3.Cents))
{
Console.WriteLine("amount3.Dollars has address 0x{0:X}", (uint)pDollars2);
Console.WriteLine("amount3.Cents has address 0x{0:X}", (uint)pCents2);
*pDollars2 = -100;
Console.WriteLine("amount3 contains {0}", amount3);
}
Console.ReadLine();
}
