Absolute

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The absolute modifier causes a variable to be stored at the same memory location as another variable.


// Example on little endian x64 processor
Uses SysUtils;

Var
    anInt      : Integer;
    anotherInt : Integer absolute anInt;
    firstByte  : Byte    absolute anInt;
 
begin
    // with both Integer variables at the same memory location, a change to one is reflected
    // in the other
    anInt := 20;

    WriteLn(IntToStr(anInt) + '  ' + IntToStr(anotherInt)); // Outputs: 20  20

    // a value of 20 fits in the first byte:

    WriteLn('firstByte: ' + IntToStr(firstByte));           // Outputs: firstByte: 20
   
    anotherInt := 333;

    WriteLn(IntToStr(anInt) + '  ' + IntToStr(anotherInt)); // Outputs: 333 333

    // 333 is too large a value to fit in one byte
    // little-endian x64 - least significant byte is first in memory:
    // 333 = 101001101 =  01001101 00000001 in memory = 0x4D 0x01 = decimal: 77 1

    WriteLn('firstByte: ' + IntToStr(firstByte));           // Outputs: firstByte: 77
end.