GDAL

Public Member Functions | Static Public Member Functions | List of all members
GDALExtendedDataType Class Reference

Class used to represent potentially complex data types. More...

`#include <gdal_priv.h>`

## Public Member Functions
| GDALExtendedDataType (const GDALExtendedDataType &)
| Copy constructor.
GDALExtendedDataType & | operator= (GDALExtendedDataType &&)
| Move assignment.
bool | operator== (const GDALExtendedDataType &) const
| Equality operator. More...
bool | operator!= (const GDALExtendedDataType &other) const
| Non-equality operator.
const std::string & | GetName () const
| Return type name. More...
GDALExtendedDataTypeClass | GetClass () const
| Return type class. More...
GDALDataType | GetNumericDataType () const
| Return numeric data type (only valid when GetClass() == GEDTC_NUMERIC) More...
const std::vector< std::unique_ptr< GDALEDTComponent > > & | GetComponents () const
| Return the components of the data type (only valid when GetClass() == GEDTC_COMPOUND) More...
size_t | GetSize () const
| Return data type size in bytes. More...
size_t | GetMaxStringLength () const
| Return the maximum length of a string in bytes. More...
bool | CanConvertTo (const GDALExtendedDataType &other) const
| Return whether this data type can be converted to the other one. More...
bool | NeedsFreeDynamicMemory () const
| Return whether the data type holds dynamically allocated memory, that needs to be freed with FreeDynamicMemory().
void | FreeDynamicMemory (void *pBuffer) const
| Release the dynamic memory (strings typically) from a raw value. More...

## Static Public Member Functions
static GDALExtendedDataType | Create (GDALDataType eType)
| Return a new GDALExtendedDataType of class GEDTC_NUMERIC. More...
static GDALExtendedDataType | Create (const std::string &osName, size_t nTotalSize, std::vector< std::unique_ptr< GDALEDTComponent >> &&components)
| Return a new GDALExtendedDataType of class GEDTC_COMPOUND. More...
static GDALExtendedDataType | CreateString (size_t nMaxStringLength=0)
| Return a new GDALExtendedDataType of class GEDTC_STRING. More...
static bool | CopyValue (const void *pSrc, const GDALExtendedDataType &srcType, void *pDst, const GDALExtendedDataType &dstType)
| Convert a value from a source type to a destination type. More...

## Detailed Description

Class used to represent potentially complex data types.

Several classes of data types are supported: numeric (based on GDALDataType), compound or string.

Since
  GDAL 3.1

## Member Function Documentation

## ◆ CanConvertTo()

bool GDALExtendedDataType::CanConvertTo | ( | const GDALExtendedDataType & | other | ) | const

Return whether this data type can be converted to the other one.

This is the same as the C function GDALExtendedDataTypeCanConvertTo().

Parameters

  other | Target data type for the conversion being considered.

## ◆ CopyValue()

bool GDALExtendedDataType::CopyValue | ( | const void * | pSrc,
|  | const GDALExtendedDataType & | srcType,
|  | void * | pDst,
|  | const GDALExtendedDataType & | dstType
| ) |  |
| static

Convert a value from a source type to a destination type.

If dstType is GEDTC_STRING, the written value will be a pointer to a char*, that must be freed with CPLFree().

## ◆ Create() [1/2]

GDALExtendedDataType GDALExtendedDataType::Create | ( | const std::string & | osName,
|  | size_t | nTotalSize,
|  | std::vector< std::unique_ptr< GDALEDTComponent >> && | components
| ) |  |
| static

Return a new GDALExtendedDataType of class GEDTC_COMPOUND.

This is the same as the C function GDALExtendedDataTypeCreateCompound()

Parameters

  osName | Type name.
  nTotalSize | Total size of the type in bytes. Should be large enough to store all components.
  components | Components of the compound type.

## ◆ Create() [2/2]

GDALExtendedDataType GDALExtendedDataType::Create | ( | GDALDataType | eType | ) |
| static

Return a new GDALExtendedDataType of class GEDTC_NUMERIC.

This is the same as the C function GDALExtendedDataTypeCreate()

Parameters

  eType | Numeric data type.

## ◆ CreateString()

GDALExtendedDataType GDALExtendedDataType::CreateString | ( | size_t | nMaxStringLength = `0` | ) |
| static

Return a new GDALExtendedDataType of class GEDTC_STRING.

This is the same as the C function GDALExtendedDataTypeCreateString().

Parameters

  nMaxStringLength | maximum length of a string in bytes. 0 if unknown/unlimited

## ◆ FreeDynamicMemory()

void GDALExtendedDataType::FreeDynamicMemory | ( | void * | pBuffer | ) | const

Release the dynamic memory (strings typically) from a raw value.

This is the same as the C function GDALExtendedDataTypeFreeDynamicMemory().

Parameters

  pBuffer | Raw buffer of a single element of an attribute or array value.

## ◆ GetClass()

GDALExtendedDataTypeClass GDALExtendedDataType::GetClass | ( |  | ) | const
| inline

Return type class.

This is the same as the C function GDALExtendedDataTypeGetClass()

## ◆ GetComponents()

const std::vector<std::unique_ptr<GDALEDTComponent> >& GDALExtendedDataType::GetComponents | ( |  | ) | const
| inline

Return the components of the data type (only valid when GetClass() == GEDTC_COMPOUND)

This is the same as the C function GDALExtendedDataTypeGetComponents()

## ◆ GetMaxStringLength()

size_t GDALExtendedDataType::GetMaxStringLength | ( |  | ) | const
| inline

Return the maximum length of a string in bytes.

0 indicates unknown/unlimited string.

## ◆ GetName()

const std::string& GDALExtendedDataType::GetName | ( |  | ) | const
| inline

Return type name.

This is the same as the C function GDALExtendedDataTypeGetName()

## ◆ GetNumericDataType()

GDALDataType GDALExtendedDataType::GetNumericDataType | ( |  | ) | const
| inline

Return numeric data type (only valid when GetClass() == GEDTC_NUMERIC)

This is the same as the C function GDALExtendedDataTypeGetNumericDataType()

## ◆ GetSize()

size_t GDALExtendedDataType::GetSize | ( |  | ) | const
| inline

Return data type size in bytes.

For a string, this will be size of a char* pointer.

This is the same as the C function GDALExtendedDataTypeGetSize()

## ◆ operator==()

bool GDALExtendedDataType::operator== | ( | const GDALExtendedDataType & | other | ) | const

Equality operator.

This is the same as the C function GDALExtendedDataTypeEquals().

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

- gdal_priv.h
- gdalmultidim.cpp