var Class Reference

A variant class, that can be used to hold a range of primitive values. More...

Public Types
typedef const var(DynamicObject::*	MethodFunction )(const var *arguments, int numArguments)
typedef Identifier	identifier

Public Member Functions
	var () noexcept
	Creates a void variant.
	~var () noexcept
	Destructor.
	var (const var &valueToCopy)
	var (int value) noexcept
	var (int64 value) noexcept
	var (bool value) noexcept
	var (double value) noexcept
	var (const char *value)
	var (const wchar_t *value)
	var (const String &value)
	var (const Array< var > &value)
	var (ReferenceCountedObject *object)
	var (MethodFunction method) noexcept
	var (const void *binaryData, size_t dataSize)
	var (const MemoryBlock &binaryData)
var &	operator= (const var &valueToCopy)
var &	operator= (int value)
var &	operator= (int64 value)
var &	operator= (bool value)
var &	operator= (double value)
var &	operator= (const char *value)
var &	operator= (const wchar_t *value)
var &	operator= (const String &value)
var &	operator= (const Array< var > &value)
var &	operator= (ReferenceCountedObject *object)
var &	operator= (MethodFunction method)
void	swapWith (var &other) noexcept
	operator int () const noexcept
	operator int64 () const noexcept
	operator bool () const noexcept
	operator float () const noexcept
	operator double () const noexcept
	operator String () const
String	toString () const
Array< var > *	getArray () const noexcept
	If this variant holds an array, this provides access to it.
MemoryBlock *	getBinaryData () const noexcept
	If this variant holds a memory block, this provides access to it.
ReferenceCountedObject *	getObject () const noexcept
DynamicObject *	getDynamicObject () const noexcept
bool	isVoid () const noexcept
bool	isInt () const noexcept
bool	isInt64 () const noexcept
bool	isBool () const noexcept
bool	isDouble () const noexcept
bool	isString () const noexcept
bool	isObject () const noexcept
bool	isArray () const noexcept
bool	isBinaryData () const noexcept
bool	isMethod () const noexcept
bool	equals (const var &other) const noexcept
	Returns true if this var has the same value as the one supplied.
bool	equalsWithSameType (const var &other) const noexcept
	Returns true if this var has the same value and type as the one supplied.
int	size () const
	If the var is an array, this returns the number of elements.
const var &	operator[] (int arrayIndex) const
	If the var is an array, this can be used to return one of its elements.
var &	operator[] (int arrayIndex)
	If the var is an array, this can be used to return one of its elements.
void	append (const var &valueToAppend)
	Appends an element to the var, converting it to an array if it isn't already one.
void	insert (int index, const var &value)
	Inserts an element to the var, converting it to an array if it isn't already one.
void	remove (int index)
	If the var is an array, this removes one of its elements.
void	resize (int numArrayElementsWanted)
	Treating the var as an array, this resizes it to contain the specified number of elements.
int	indexOf (const var &value) const
	If the var is an array, this searches it for the first occurrence of the specified value, and returns its index.
var	operator[] (const Identifier &propertyName) const
	If this variant is an object, this returns one of its properties.
var	operator[] (const char *propertyName) const
	If this variant is an object, this returns one of its properties.
var	getProperty (const Identifier &propertyName, const var &defaultReturnValue) const
	If this variant is an object, this returns one of its properties, or a default fallback value if the property is not set.
var	call (const Identifier &method) const
	If this variant is an object, this invokes one of its methods with no arguments.
var	call (const Identifier &method, const var &arg1) const
	If this variant is an object, this invokes one of its methods with one argument.
var	call (const Identifier &method, const var &arg1, const var &arg2) const
	If this variant is an object, this invokes one of its methods with 2 arguments.
var	call (const Identifier &method, const var &arg1, const var &arg2, const var &arg3)
	If this variant is an object, this invokes one of its methods with 3 arguments.
var	call (const Identifier &method, const var &arg1, const var &arg2, const var &arg3, const var &arg4) const
	If this variant is an object, this invokes one of its methods with 4 arguments.
var	call (const Identifier &method, const var &arg1, const var &arg2, const var &arg3, const var &arg4, const var &arg5) const
	If this variant is an object, this invokes one of its methods with 5 arguments.
var	invoke (const Identifier &method, const var *arguments, int numArguments) const
	If this variant is an object, this invokes one of its methods with a list of arguments.
void	writeToStream (OutputStream &output) const
	Writes a binary representation of this value to a stream.

Static Public Member Functions
static var	readFromStream (InputStream &input)
	Reads back a stored binary representation of a value.

Static Public Attributes
static const var	null
	A static var object that can be used where you need an empty variant object.

Detailed Description

A variant class, that can be used to hold a range of primitive values.

A var object can hold a range of simple primitive values, strings, or any kind of ReferenceCountedObject. The var class is intended to act like the kind of values used in dynamic scripting languages.

You can save/load var objects either in a small, proprietary binary format using writeToStream()/readFromStream(), or as JSON by using the JSON class.

See Also

JSON, DynamicObject

Member Typedef Documentation

typedef const var(DynamicObject::* var::MethodFunction)(const var *arguments, int numArguments)

typedef Identifier var::identifier

Constructor & Destructor Documentation

var::var ( )

noexcept

Creates a void variant.

var::~var ( )

noexcept

Destructor.

var::var

(

const var &

valueToCopy

)

var::var ( int  value )

noexcept

var::var ( int64  value )

noexcept

var::var ( bool  value )

noexcept

var::var ( double  value )

noexcept

var::var

(

const char *

value

)

var::var

(

const wchar_t *

value

)

var::var

(

const String &

value

)

var::var

(

const Array< var > &

value

)

var::var

(

ReferenceCountedObject *

object

)

var::var ( MethodFunction  method )

noexcept

var::var	(	const void *	binaryData,
		size_t	dataSize
	)

var::var

(

const MemoryBlock &

binaryData

)

Member Function Documentation

var& var::operator=

(

const var &

valueToCopy

)

var& var::operator=

(

int

value

)

var& var::operator=

(

int64

value

)

var& var::operator=

(

bool

value

)

var& var::operator=

(

double

value

)

var& var::operator=

(

const char *

value

)

var& var::operator=

(

const wchar_t *

value

)

var& var::operator=

(

const String &

value

)

var& var::operator=

(

const Array< var > &

value

)

var& var::operator=

(

ReferenceCountedObject *

object

)

var& var::operator=

(

MethodFunction

method

)

void var::swapWith ( var &  other )

noexcept

var::operator int ( ) const

noexcept

var::operator int64 ( ) const

noexcept

var::operator bool ( ) const

noexcept

var::operator float ( ) const

noexcept

var::operator double ( ) const

noexcept

var::operator String

(

)

const

String var::toString

(

)

const

Array<var>* var::getArray ( ) const

noexcept

If this variant holds an array, this provides access to it.

NOTE: Beware when you use this - the array pointer is only valid for the lifetime of the variant that returned it, so be very careful not to call this method on temporary var objects that are the return-value of a function, and which may go out of scope before you use the array!

MemoryBlock* var::getBinaryData ( ) const

noexcept

If this variant holds a memory block, this provides access to it.

NOTE: Beware when you use this - the MemoryBlock pointer is only valid for the lifetime of the variant that returned it, so be very careful not to call this method on temporary var objects that are the return-value of a function, and which may go out of scope before you use the MemoryBlock!

ReferenceCountedObject* var::getObject ( ) const

noexcept

DynamicObject* var::getDynamicObject ( ) const

noexcept

bool var::isVoid ( ) const

noexcept

bool var::isInt ( ) const

noexcept

bool var::isInt64 ( ) const

noexcept

bool var::isBool ( ) const

noexcept

bool var::isDouble ( ) const

noexcept

bool var::isString ( ) const

noexcept

bool var::isObject ( ) const

noexcept

bool var::isArray ( ) const

noexcept

bool var::isBinaryData ( ) const

noexcept

bool var::isMethod ( ) const

noexcept

bool var::equals ( const var &  other ) const

noexcept

Returns true if this var has the same value as the one supplied.

Note that this ignores the type, so a string var "123" and an integer var with the value 123 are considered to be equal.

See Also

equalsWithSameType

bool var::equalsWithSameType ( const var &  other ) const

noexcept

Returns true if this var has the same value and type as the one supplied.

This differs from equals() because e.g. "123" and 123 will be considered different.

See Also

equals

int var::size

(

)

const

If the var is an array, this returns the number of elements.

If the var isn't actually an array, this will return 0.

const var& var::operator[]

(

int

arrayIndex

)

const

If the var is an array, this can be used to return one of its elements.

To call this method, you must make sure that the var is actually an array, and that the index is a valid number. If these conditions aren't met, behaviour is undefined. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

var& var::operator[]

(

int

arrayIndex

)

If the var is an array, this can be used to return one of its elements.

To call this method, you must make sure that the var is actually an array, and that the index is a valid number. If these conditions aren't met, behaviour is undefined. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

void var::append

(

const var &

valueToAppend

)

Appends an element to the var, converting it to an array if it isn't already one.

If the var isn't an array, it will be converted to one, and if its value was non-void, this value will be kept as the first element of the new array. The parameter value will then be appended to it. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

void var::insert	(	int	index,
		const var &	value
	)

Inserts an element to the var, converting it to an array if it isn't already one.

If the var isn't an array, it will be converted to one, and if its value was non-void, this value will be kept as the first element of the new array. The parameter value will then be inserted into it. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

void var::remove

(

int

index

)

If the var is an array, this removes one of its elements.

If the index is out-of-range or the var isn't an array, nothing will be done. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

void var::resize

(

int

numArrayElementsWanted

)

Treating the var as an array, this resizes it to contain the specified number of elements.

If the var isn't an array, it will be converted to one, and if its value was non-void, this value will be kept as the first element of the new array before resizing. For more control over the array's contents, you can call getArray() and manipulate it directly as an Array<var>.

int var::indexOf

(

const var &

value

)

const

If the var is an array, this searches it for the first occurrence of the specified value, and returns its index.

If the var isn't an array, or if the value isn't found, this returns -1.

var var::operator[]

(

const Identifier &

propertyName

)

const

If this variant is an object, this returns one of its properties.

var var::operator[]

(

const char *

propertyName

)

const

If this variant is an object, this returns one of its properties.

var var::getProperty	(	const Identifier &	propertyName,
		const var &	defaultReturnValue
	)		const

If this variant is an object, this returns one of its properties, or a default fallback value if the property is not set.

var var::call

(

const Identifier &

method

)

const

If this variant is an object, this invokes one of its methods with no arguments.

var var::call	(	const Identifier &	method,
		const var &	arg1
	)		const

If this variant is an object, this invokes one of its methods with one argument.

var var::call	(	const Identifier &	method,
		const var &	arg1,
		const var &	arg2
	)		const

If this variant is an object, this invokes one of its methods with 2 arguments.

var var::call	(	const Identifier &	method,
		const var &	arg1,
		const var &	arg2,
		const var &	arg3
	)

If this variant is an object, this invokes one of its methods with 3 arguments.

var var::call	(	const Identifier &	method,
		const var &	arg1,
		const var &	arg2,
		const var &	arg3,
		const var &	arg4
	)		const

If this variant is an object, this invokes one of its methods with 4 arguments.

var var::call	(	const Identifier &	method,
		const var &	arg1,
		const var &	arg2,
		const var &	arg3,
		const var &	arg4,
		const var &	arg5
	)		const

If this variant is an object, this invokes one of its methods with 5 arguments.

var var::invoke	(	const Identifier &	method,
		const var *	arguments,
		int	numArguments
	)		const

If this variant is an object, this invokes one of its methods with a list of arguments.

void var::writeToStream

(

OutputStream &

output

)

const

Writes a binary representation of this value to a stream.

The data can be read back later using readFromStream().

See Also

JSON

static var var::readFromStream ( InputStream &  input )

static

Reads back a stored binary representation of a value.

The data in the stream must have been written using writeToStream(), or this will have unpredictable results.

See Also

JSON

Member Data Documentation

const var var::null

static

A static var object that can be used where you need an empty variant object.

---

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

• juce_Variant.h