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. Be aware that:
- On Intel 32-bit Windows systems, the size of System.Extended is 10 bytes.
- On Intel 64-bit Linux systems and Intel 64-bit macOS systems, the size of System.Extended is 16 bytes.
- On Intel 64-bit Windows systems and all ARM systems, including iOS 64-bit, Android 32-bit and 64-bit and macOS 64-bit, 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.
Note: The sizes listed are dependent on the selected target platform.
The following code displays 10 on Win32, 8 on Win64 and 16 on macOS and Linux.
Writeln(IntToStr(SizeOf(Extended)));