pp::VarArrayBuffer Class Reference

#include <var_array_buffer.h>

Inheritance diagram for pp::VarArrayBuffer:

Collaboration diagram for pp::VarArrayBuffer:

Public Member Functions
	VarArrayBuffer ()
	VarArrayBuffer (const Var &var)
	VarArrayBuffer (uint32_t size_in_bytes)
	VarArrayBuffer (const VarArrayBuffer &buffer)
	Copy constructor. More...
virtual	~VarArrayBuffer ()
VarArrayBuffer &	operator= (const VarArrayBuffer &other)
virtual Var &	operator= (const Var &other)
uint32_t	ByteLength () const
void *	Map ()
void	Unmap ()
Public Member Functions inherited from pp::Var
	Var ()
	Var (Null)
	A constructor used to create a Var of type Null. More...
	Var (bool b)
	Var (int32_t i)
	Var (double d)
	Var (const char *utf8_str)
	A constructor used to create a UTF-8 character Var. More...
	Var (const std::string &utf8_str)
	A constructor used to create a UTF-8 character Var. More...
	Var (const pp::Resource &resource)
	A constructor used to create a resource Var. More...
	Var (PassRef, const PP_Var &var)
	Var (const PP_Var &var)
	A constructor that increments the reference count. More...
	Var (DontManage, const PP_Var &var)
	Var (const Var &other)
	A constructor for copying a Var. More...
virtual	~Var ()
	Destructor. More...
bool	operator== (const Var &other) const
bool	is_undefined () const
bool	is_null () const
bool	is_bool () const
bool	is_string () const
bool	is_object () const
bool	is_array () const
bool	is_dictionary () const
bool	is_resource () const
bool	is_int () const
bool	is_double () const
bool	is_number () const
bool	is_array_buffer () const
	This function determines if this Var is an ArrayBuffer. More...
bool	AsBool () const
int32_t	AsInt () const
double	AsDouble () const
std::string	AsString () const
pp::Resource	AsResource () const
const PP_Var &	pp_var () const
PP_Var	Detach ()
std::string	DebugString () const

Additional Inherited Members
Protected Attributes inherited from pp::Var
PP_Var	var_
bool	is_managed_

Detailed Description

VarArrayBuffer provides a way to interact with JavaScript ArrayBuffers, which represent a contiguous sequence of bytes. Note that these vars are not part of the embedding page's DOM, and can only be shared with JavaScript using the PostMessage and HandleMessage functions of Instance.

Definition at line 20 of file var_array_buffer.h.

Constructor & Destructor Documentation

pp::VarArrayBuffer::VarArrayBuffer

(

)

The default constructor constructs a VarArrayBuffer which is 0 byte long.

pp::VarArrayBuffer::VarArrayBuffer ( const Var &  var )

explicit

Construct a VarArrayBuffer given a var for which is_array_buffer() is true. This will refer to the same ArrayBuffer as var, but allows you to access methods specific to VarArrayBuffer.

Parameters

[in]

var

An ArrayBuffer var.

pp::VarArrayBuffer::VarArrayBuffer ( uint32_t  size_in_bytes )

explicit

Construct a new VarArrayBuffer which is size_in_bytes bytes long and initialized to zero.

Parameters

[in]

size_in_bytes

The size of the constructed ArrayBuffer in bytes.

pp::VarArrayBuffer::VarArrayBuffer ( const VarArrayBuffer &  buffer )

inline

Copy constructor.

Definition at line 42 of file var_array_buffer.h.

virtual pp::VarArrayBuffer::~VarArrayBuffer ( )

inlinevirtual

Definition at line 44 of file var_array_buffer.h.

Member Function Documentation

uint32_t pp::VarArrayBuffer::ByteLength

(

)

const

ByteLength() retrieves the length of the VarArrayBuffer in bytes.

Returns

The length of the VarArrayBuffer in bytes.

void* pp::VarArrayBuffer::Map

(

)

Map() maps the ArrayBuffer in to the module's address space and returns a pointer to the beginning of the internal buffer for this ArrayBuffer. ArrayBuffers are copied when transmitted, so changes to the underlying memory are not automatically available to the embedding page.

Note that calling Map() can be a relatively expensive operation. Use care when calling it in performance-critical code. For example, you should call it only once when looping over an ArrayBuffer.

Example:

char* data = static_cast<char*>(array_buffer_var.Map());
uint32_t byte_length = array_buffer_var.ByteLength();
for (uint32_t i = 0; i < byte_length; ++i)
  data[i] = 'A';

Returns

A pointer to the internal buffer for this ArrayBuffer.

VarArrayBuffer& pp::VarArrayBuffer::operator=

(

const VarArrayBuffer &

other

)

This function assigns one VarArrayBuffer to another VarArrayBuffer.

Parameters

[in]

other

The VarArrayBuffer to be assigned.

Returns

The resulting VarArrayBuffer.

virtual Var& pp::VarArrayBuffer::operator= ( const Var &  other )

virtual

This function assigns one VarArrayBuffer to another VarArrayBuffer. A Var's assignment operator is overloaded here so that we can check for assigning a non-ArrayBuffer var to a VarArrayBuffer.

Parameters

[in]

other

The VarArrayBuffer to be assigned.

Returns

The resulting VarArrayBuffer (as a Var&).

Reimplemented from pp::Var.

void pp::VarArrayBuffer::Unmap

(

)

Unmap() unmaps this ArrayBuffer var from the module address space. Use this if you want to save memory but might want to call Map() to map the buffer again later.

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

• var_array_buffer.h