sizeOf()

The sizeOf() system function returns the compile-time-evaluated size of the type passed in as parameter.

Syntax:

method sizeOf(Type): Integer;

int sizeOf(Type);

func sizeOf(_ Type) ->  Int

int sizeOf(Type);

This is particularly useful to determine the storage size for Records/Structs or to determine the bitness of Integer types.

Example:

type
  MyRecord = record
    FieldA: Integer := 5;
    FieldB: Byte;
  end;

...
writeLn("sizeOf(MyRecord) = {0}", sizeOf(MyRecord));
writeLn("sizeOf(Boolean) = {0}", sizeOf(Boolean));
writeLn("sizeOf(Byte) = {0}", sizeOf(Byte));
writeLn("sizeOf(Word) = {0}", sizeOf(Word));
writeLn("sizeOf(Integer) = {0}", sizeOf(Integer));
writeLn("sizeOf(Double) = {0}", sizeOf(Double));

public struct MyRecord 
{
    int FieldA: Integer = 5,
    byte FieldB
}

...
writeLn("sizeOf(MyRecord) = {0}", sizeOf(MyRecord));
writeLn("sizeOf(Boolean) = {0}", sizeOf(Boolean));
writeLn("sizeOf(Byte) = {0}", sizeOf(Byte));
writeLn("sizeOf(Word) = {0}", sizeOf(Word));
writeLn("sizeOf(Integer) = {0}", sizeOf(Integer));
writeLn("sizeOf(Double) = {0}", sizeOf(Double));

public struct MyRecord {
    Int FieldA: Integer = 5,
    Byte FieldB
}

...
writeLn("sizeOf(MyRecord) = {0}", sizeOf(MyRecord))
writeLn("sizeOf(Boolean) = {0}", sizeOf(Boolean))
writeLn("sizeOf(Byte) = {0}", sizeOf(Byte))
writeLn("sizeOf(Word) = {0}", sizeOf(Word))
writeLn("sizeOf(Integer) = {0}", sizeOf(Integer))
writeLn("sizeOf(Double) = {0}", sizeOf(Double))

public struct MyRecord {
    int FieldA: Integer = 5,
    Byte FieldB
}

...
writeLn("sizeOf(MyRecord) = {0}", sizeOf(MyRecord));
writeLn("sizeOf(Boolean) = {0}", sizeOf(Boolean));
writeLn("sizeOf(Byte) = {0}", sizeOf(Byte));
writeLn("sizeOf(Word) = {0}", sizeOf(Word));
writeLn("sizeOf(Integer) = {0}", sizeOf(Integer));
writeLn("sizeOf(Double) = {0}", sizeOf(Double));

When this method is executed, we see the following results:

sizeOf(MyRecord) = 8
sizeOf(Boolean) = 1
sizeOf(Byte) = 1
sizeOf(Word) = 2
sizeOf(Integer) = 4
sizeOf(Double) = 8

This example illustrates how record fields are placed on integer boundaries by default. The StructLayout and Packed aspects can be used to control this behavior.

sizeOf()

See Also