---
name: "VistaIORepn"
section: "3"
platform: "linux"
package: "libvistaio-dev"
version: "1.2.19-3+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/VistaIORepn"
---

# VistaIORepn(3)

obtain information about a type's representation

## NAME

VistaIORepnName, VistaIORepnSize, etc. - obtain information about a type's representation

## SYNOPSIS

```
typedef enum {
```

**VistaIOUnknownRepn,**\
 **VistaIOBitRepn, VistaIOUByteRepn, VistaIOSByteRepn, VistaIOShortRepn, VistaIOLongRepn,**\
 **VistaIOFloatRepn, VistaIODoubleRepn,**\
 **VistaIOAttrListRepn, VistaIOBooleanRepn, VistaIOBundleRepn, VistaIOListRepn, VistaIOPointerRepn,** **VistaIOStringRepn,**\
 **VistaIOEdgesRepn, VistaIOImageRepn**

```
} VistaIORepnKind;
```

**VistaIOBoolean VistaIOIsFloatPtRepn (VistaIORepnKind *repn*)**

**VistaIOBoolean VistaIOIsIntegerRepn (VistaIORepnKind *repn*)**

**VistaIOStringConst VistaIORepnName (VistaIORepnKind *repn*)**

**VistaIODouble VistaIORepnMaxValue (VistaIORepnKind *repn*)**

**VistaIODouble VistaIORepnMinValue (VistaIORepnKind *repn*)**

**int VistaIORepnPrecision (VistaIORepnKind *repn*)**

**size\_t VistaIORepnSize (VistaIORepnKind *repn*)**

## ARGUMENTS

- *repn*

  **Specifies the data type about which information is sought.**

## DESCRIPTION

**These macros return information about Vista data types, each of which is**  **identified by one of the VistaIORepnKind series of integer codes.**

**VistaIOIsFloatPtRepn returns**  **TRUE** **if** *repn* **is VistaIOFloatRepn or VistaIODoubleRepn.**

**VistaIOIsIntegerRepn returns** **TRUE** **if** *repn* **is VistaIOBitRepn, VistaIOUByteRepn, VistaIOSByteRepn,**  **VistaIOShortRepn, or VistaIOLongRepn.**

**VistaIORepnName returns a string naming the specified type. For example,**  **when** *repn* **is VistaIOBitRepn it returns \`\`bit''.**

**VistaIORepnMaxValue returns the maximum value that can be represented by the**  **specified type.**

**VistaIORepnMinValue returns the minimum (most negative) value that can be**  **represented by the specified type.**

**VistaIORepnPrecision returns the minimum number of bits needed to represent** **the specified type on any machine.**

**VistaIORepnSize returns the size, in bytes, of the specified type on** **the present machine.**

## SEE ALSO

[**VistaIOConst**(3)](/VistaIOConst/3.md),

## NOTES

**VistaIORepnMaxValue, VistaIORepnMinValue, and VistaIORepnPrecision are**  **undefined (and return 0) if** *repn* **isn't VistaIOBitRepn through**  **VistaIODoubleRepn, or VistaIOBooleanRepn.**

**A new value in the VistaIORepnKind series is assigned by**  **VistaIORegisterType when it is called to register a new object type. That**  **new value can be used in a call to any of these macros — all return 0 or**  **FALSE** **except VistaIORepnName, which returns the name of the newly registered**  **type.**

## AUTHOR

**Art Pope \<pope@cs.ubc.ca\>**

**Adaption to vistaio: Gert Wollny \<gw.fossdev@gmail.com\>**