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VOption Class Reference

`#include <VImage8.h>`

## Public Member Functions

VOption * | set (const char *name, bool value)
VOption * | set (const char *name, int value)
VOption * | set (const char *name, guint64 value)
VOption * | set (const char *name, double value)
VOption * | set (const char *name, const char *value)
VOption * | set (const char *name, const VObject value)
VOption * | set (const char *name, std::vector< int > value)
VOption * | set (const char *name, std::vector< double > value)
VOption * | set (const char *name, std::vector< VImage > value)
VOption * | set (const char *name, VipsBlob *value)
VOption * | set (const char *name, bool *value)
VOption * | set (const char *name, int *value)
VOption * | set (const char *name, double *value)
VOption * | set (const char *name, VImage *value)
VOption * | set (const char *name, std::vector< double > *value)
VOption * | set (const char *name, VipsBlob **blob)
void | set_operation (VipsOperation *operation)
void | get_operation (VipsOperation *operation)

## Detailed Description

A list of name-value pairs. Pass these to libvips operations to set options. For example:

    VImage out = in.embed(10, 10, 1000, 1000, VImage::option()
        ->set("extend", "background")
        ->set("background", 128));

The set member functions will take copies (or hold references to) compound objects, so you can free them immediately afterwards if necessary.

You can get values back from operations by using the * form of the set member functions. For example:

    VImage in = VImage::new_from_file(argv[1]);
    int x, y;
    double value = in.max(VImage::option()
        ->set("x", &x)
        ->set("y", &y));

## Member Function Documentation

## get_operation()

void VOption::get_operation | ( | VipsOperation * | operation | ) |

Walk the set of options, fetching any output values. This is used internally by VImage::call().

## set() [1/16]

VOption * VOption::set | ( | const char * | name,
|  | bool * | value )

Set an option which will return a bool value.

## set() [2/16]

VOption * VOption::set | ( | const char * | name,
|  | bool | value )

Set an input boolean option.

## set() [3/16]

VOption * VOption::set | ( | const char * | name,
|  | const char * | value )

Set an input string option.

A copy is taken of the object.

## set() [4/16]

VOption * VOption::set | ( | const char * | name,
|  | const VObject | value )

Set a libvips object as an option. These can be images, sources, targets, etc.

A copy is taken of the object.

## set() [5/16]

VOption * VOption::set | ( | const char * | name,
|  | double * | value )

Set an option which will return a double value.

## set() [6/16]

VOption * VOption::set | ( | const char * | name,
|  | double | value )

Set an input double option.

## set() [7/16]

VOption * VOption::set | ( | const char * | name,
|  | guint64 | value )

Set an input unsigned 64-bit integer option.

## set() [8/16]

VOption * VOption::set | ( | const char * | name,
|  | int * | value )

Set an option which will return an integer value.

## set() [9/16]

VOption * VOption::set | ( | const char * | name,
|  | int | value )

Set an input int option. This is used for enums as well, or you can use the string version.

## set() [10/16]

VOption * VOption::set | ( | const char * | name,
|  | std::vector< double > * | value )

Set an option which will return an array of doubles.

## set() [11/16]

VOption * VOption::set | ( | const char * | name,
|  | std::vector< double > | value )

Set an array of doubles as an input option.

A copy is taken of the object.

## set() [12/16]

VOption * VOption::set | ( | const char * | name,
|  | std::vector< int > | value )

Set an array of integers as an input option.

A copy is taken of the object.

## set() [13/16]

VOption * VOption::set | ( | const char * | name,
|  | std::vector< VImage > | value )

Set an array of images as an input option.

A copy is taken of the object.

## set() [14/16]

VOption * VOption::set | ( | const char * | name,
|  | VImage * | value )

Set an option which will return a reference to an image.

## set() [15/16]

VOption * VOption::set | ( | const char * | name,
|  | VipsBlob ** | blob )

Set an option which will return a binary object, such as an ICC profile.

## set() [16/16]

VOption * VOption::set | ( | const char * | name,
|  | VipsBlob * | value )

Set a binary object an input option. Use vips_blob_new() to make blobs.

A copy is taken of the object.

## set_operation()

void VOption::set_operation | ( | VipsOperation * | operation | ) |

Walk the set of options, setting options on the operation. This is used internally by VImage::call().

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

- /build/vips-Wqox7w/vips-8.18.4/cplusplus/include/vips/VImage8.h
- /build/vips-Wqox7w/vips-8.18.4/cplusplus/VImage.cpp