System.Extended
Delphi
type Extended = { built-in type };
C++
typedef long double Extended; // 10 byte real
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
type typedef |
public | System.pas sysmac.h |
System | System |
Description
Represents a high-precision floating-point value.
System.Extended offers greater precision than other real types, but is less portable. Be careful using System.Extended if you are creating data files to share across platforms.
On Win32 systems, the size of System.Extended is 10 bytes.
On Win64 systems, however, the System.Extended type is an alias for System.Double, which is only 8 bytes. This difference can adversely affect numeric precision in floating-point operations. For more information, see Delphi Considerations for Multi-Device Applications.
Writeln(IntToStr(SizeOf(Extended))); // displays 10 on Win32 and 8 on Win64