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| HDF5 Last Updated on 2026-07-28 The HDF5 Field Guide

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DEC Alpha
Datatypes (H5T) » Predefined Datatypes » By CPU

## Detailed Description

Predefined DEC Alpha-specific Datatypes
Datatype | Description
--- | ---
H5T_ALPHA_I8 | 8-bit little-endian signed integer (2's complement)
H5T_ALPHA_I16 | 16-bit little-endian signed integer (2's complement)
H5T_ALPHA_I32 | 32-bit little-endian signed integer (2's complement)
H5T_ALPHA_I64 | 64-bit little-endian signed integer (2's complement)
H5T_ALPHA_U8 | 8-bit little-endian unsigned integer
H5T_ALPHA_U16 | 16-bit little-endian unsigned integer
H5T_ALPHA_U32 | 32-bit little-endian unsigned integer
H5T_ALPHA_U64 | 64-bit little-endian unsigned integer
H5T_ALPHA_B8 | 8-bit little-endian bitfield
H5T_ALPHA_B16 | 16-bit little-endian bitfield
H5T_ALPHA_B32 | 32-bit little-endian bitfield
H5T_ALPHA_B64 | 64-bit little-endian bitfield
H5T_ALPHA_F32 | 32-bit little-endian IEEE floating point
H5T_ALPHA_F64 | 64-bit little-endian IEEE floating point

## Macros
#define | H5T_ALPHA_B16 H5T_STD_B16LE
#define | H5T_ALPHA_B32 H5T_STD_B32LE
#define | H5T_ALPHA_B64 H5T_STD_B64LE
#define | H5T_ALPHA_B8 H5T_STD_B8LE
#define | H5T_ALPHA_F32 H5T_IEEE_F32LE
#define | H5T_ALPHA_F64 H5T_IEEE_F64LE
#define | H5T_ALPHA_I16 H5T_STD_I16LE
#define | H5T_ALPHA_I32 H5T_STD_I32LE
#define | H5T_ALPHA_I64 H5T_STD_I64LE
#define | H5T_ALPHA_I8 H5T_STD_I8LE
#define | H5T_ALPHA_U16 H5T_STD_U16LE
#define | H5T_ALPHA_U32 H5T_STD_U32LE
#define | H5T_ALPHA_U64 H5T_STD_U64LE
#define | H5T_ALPHA_U8 H5T_STD_U8LE
#define | H5T_VAX_F32 (H5OPEN H5T_VAX_F32_g)
#define | H5T_VAX_F64 (H5OPEN H5T_VAX_F64_g)

## Macro Definition Documentation

## ◆ H5T_ALPHA_B16

#define H5T_ALPHA_B16 H5T_STD_B16LE

16-bit little-endian bitfield for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_B32

#define H5T_ALPHA_B32 H5T_STD_B32LE

32-bit little-endian bitfield for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_B64

#define H5T_ALPHA_B64 H5T_STD_B64LE

64-bit little-endian bitfield for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_B8

#define H5T_ALPHA_B8 H5T_STD_B8LE

8-bit little-endian bitfield for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_F32

#define H5T_ALPHA_F32 H5T_IEEE_F32LE

32-bit little-endian IEEE floating-point numbers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_F64

#define H5T_ALPHA_F64 H5T_IEEE_F64LE

64-bit little-endian IEEE floating-point numbers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_I16

#define H5T_ALPHA_I16 H5T_STD_I16LE

16-bit little-endian signed (2's complement) integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_I32

#define H5T_ALPHA_I32 H5T_STD_I32LE

32-bit little-endian signed (2's complement) integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_I64

#define H5T_ALPHA_I64 H5T_STD_I64LE

64-bit little-endian signed (2's complement) integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_I8

#define H5T_ALPHA_I8 H5T_STD_I8LE

8-bit little-endian signed (2's complement) integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_U16

#define H5T_ALPHA_U16 H5T_STD_U16LE

16-bit little-endian unsigned integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_U32

#define H5T_ALPHA_U32 H5T_STD_U32LE

32-bit little-endian unsigned integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_U64

#define H5T_ALPHA_U64 H5T_STD_U64LE

64-bit little-endian unsigned integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_ALPHA_U8

#define H5T_ALPHA_U8 H5T_STD_U8LE

8-bit little-endian unsigned integers for DEC Alpha CPUs

Since
  1.0.0

## ◆ H5T_VAX_F32

#define H5T_VAX_F32 (H5OPEN H5T_VAX_F32_g)

32-bit VAX byte order floating-point numbers for OpenVMS on DEC Alpha CPUs

Since
  1.8.0

## ◆ H5T_VAX_F64

#define H5T_VAX_F64 (H5OPEN H5T_VAX_F64_g)

64-bit VAX byte order floating-point numbers for OpenVMS on DEC Alpha CPUs

Since
  1.8.0