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# SoSelectOne Class Reference
[Engine classes]

`#include <Inventor/engines/SoSelectOne.h>`

Inheritance diagram for SoSelectOne:

List of all members.

## Detailed Description

The SoSelectOne class is used to select one value from a set of values.

The output field will be the index'th value of the input multivalue field.

Note that this engine's output field deviates a little from the "standard" output mechanism of the majority of engine classes: the SoSelectOne::output is not a permanent SoEngineOutput instance, but a pointer to a SoEngineOutput instance. The reason for this is that it is necessary to allocate the output field dynamically to make it match what the SoSelectOne::input is connected to since the type of the SoSelectOne::output always should be the same as the type of the SoSelectOne::input.

The file format for this field is a bit special. Note the leading type specification, which is not necessary for most other field types:

      SelectOne {
        type <multivaluefieldtype>
        [...fields...]
      }

## Public Member Functions
| SoSelectOne (SoType inputtype)
## Static Public Member Functions
void | initClass (void)
## Public Attributes
SoSFInt32 | index
SoMField * | input
SoEngineOutput * | output
## Friends
class | dummy

## Constructor & Destructor Documentation

SoSelectOne::SoSelectOne | ( | SoType | inputtype | ) |

| Constructor. Sets the type of the input field. The input field must be of type SoMField.

## Member Function Documentation

void SoSelectOne::initClass | ( | void |  | ) | `[static]`

| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. Reimplemented from SoEngine.

## Member Data Documentation

SoSFInt32 SoSelectOne::index

| Index of the value from the input field which will be put on the output.

SoMField * SoSelectOne::input

| The multivalue input field which we will select a single value from for our output.

SoEngineOutput * SoSelectOne::output

| (SoSField) This is the singlevalue field output containing the index'th value of SoSelectOne::input. The type of the field will of course match the type of the input field, i.e. if SoSelectOne::input is an SoMFFloat, SoSelectOne::output will be an SoSFFloat etc.

The documentation for this class was generated from the following files:

- SoSelectOne.h
- SoSelectOne.cpp