bsoncxx::document::element Class Reference

A variant view type that accesses values in serialized BSON documents. More...

#include <element.hpp>

Inheritance diagram for bsoncxx::document::element:

Public Member Functions
	element ()
	Construct an invalid element. More...
	element (const std::uint8_t *raw, std::uint32_t length, std::uint32_t offset)
	Construct an element as an offset into a buffer of bson bytes. More...
	operator bool () const
	Conversion operator to bool which is true for valid elements.
const std::uint8_t *	raw () const
	Getter for the raw bson bytes the element points to. More...
void	raw (const std::uint8_t *raw)
	Setter for the raw bson bytes the element points to. More...
std::uint32_t	length () const
	Getter for length of the raw bson bytes the element points to. More...
void	length (std::uint32_t length)
	Setter for length of the raw bson bytes the element points to. More...
std::uint32_t	offset () const
	Getter for the offset into the raw bson bytes the element points to. More...
void	offset (std::uint32_t offset)
	Setter for the offset into the raw bson bytes the element points to. More...
bsoncxx::type	type () const
	Getter for the type of the element. More...
stdx::string_view	key () const
	Getter for the element's key. More...
types::b_double	get_double () const
	Getter for elements of the b_double type. More...
types::b_utf8	get_utf8 () const
	Getter for elements of the b_utf8 type. More...
types::b_document	get_document () const
	Getter for elements of the b_document type. More...
types::b_array	get_array () const
	Getter for elements of the b_array type. More...
types::b_binary	get_binary () const
	Getter for elements of the b_binary type. More...
types::b_undefined	get_undefined () const
	Getter for elements of the b_undefined type. More...
types::b_oid	get_oid () const
	Getter for elements of the b_oid type. More...
types::b_bool	get_bool () const
	Getter for elements of the b_bool type. More...
types::b_date	get_date () const
	Getter for elements of the b_date type. More...
types::b_null	get_null () const
	Getter for elements of the b_null type. More...
types::b_regex	get_regex () const
	Getter for elements of the b_regex type. More...
types::b_dbpointer	get_dbpointer () const
	Getter for elements of the b_dbpointer type. More...
types::b_code	get_code () const
	Getter for elements of the b_code type. More...
types::b_symbol	get_symbol () const
	Getter for elements of the b_symbol type. More...
types::b_codewscope	get_codewscope () const
	Getter for elements of the b_codewscope type. More...
types::b_int32	get_int32 () const
	Getter for elements of the b_int32 type. More...
types::b_timestamp	get_timestamp () const
	Getter for elements of the b_timestamp type. More...
types::b_int64	get_int64 () const
	Getter for elements of the b_int64 type. More...
types::b_decimal128	get_decimal128 () const
	Getter for elements of the b_decimal128 type. More...
types::b_minkey	get_minkey () const
	Getter for elements of the b_minkey type. More...
types::b_maxkey	get_maxkey () const
	Getter for elements of the b_maxkey type. More...
types::value	get_value () const
	Getter for a types::value variant wrapper of the value portion of the element. More...
element	operator[] (stdx::string_view key) const
	If this element is a document, finds the first element of the document with the provided key. More...
array::element	operator[] (std::uint32_t i) const
	If this element is an array, indexes into this BSON array. More...

Detailed Description

A variant view type that accesses values in serialized BSON documents.

Element functions as a variant type, where the kind of the element can be interrogated by calling type(), the key can be extracted by calling key() and a specific value can be extracted through get_X() accessors.

Constructor & Destructor Documentation

bsoncxx::document::element::element

(

)

Construct an invalid element.

This is useful when mapping the end iterator of a document or array view.

bsoncxx::document::element::element ( const std::uint8_t *  raw, std::uint32_t  length, std::uint32_t  offset  )

explicit

Construct an element as an offset into a buffer of bson bytes.

Parameters

raw	A pointer to the raw bson bytes.
length	The size of the bson buffer.
offset	The element's offset into the buffer.

Member Function Documentation

types::b_array bsoncxx::document::element::get_array

(

)

const

Getter for elements of the b_array type.

Exceptions

bsoncxx::exception

if this element is not a b_array.

Returns

the element's value.

types::b_binary bsoncxx::document::element::get_binary

(

)

const

Getter for elements of the b_binary type.

Exceptions

bsoncxx::exception

if this element is not a b_binary.

Returns

the element's value.

types::b_bool bsoncxx::document::element::get_bool

(

)

const

Getter for elements of the b_bool type.

Exceptions

bsoncxx::exception

if this element is not a b_bool.

Returns

the element's value.

types::b_code bsoncxx::document::element::get_code

(

)

const

Getter for elements of the b_code type.

Exceptions

bsoncxx::exception

if this element is not a b_code.

Returns

the element's value.

types::b_codewscope bsoncxx::document::element::get_codewscope

(

)

const

Getter for elements of the b_codewscope type.

Exceptions

bsoncxx::exception

if this element is not a b_codewscope.

Returns

the element's value.

types::b_date bsoncxx::document::element::get_date

(

)

const

Getter for elements of the b_date type.

Exceptions

bsoncxx::exception

if this element is not a b_date.

Returns

the element's value.

types::b_dbpointer bsoncxx::document::element::get_dbpointer

(

)

const

Getter for elements of the b_dbpointer type.

Exceptions

bsoncxx::exception

if this element is not a b_dbpointer.

Returns

the element's value.

types::b_decimal128 bsoncxx::document::element::get_decimal128

(

)

const

Getter for elements of the b_decimal128 type.

Exceptions

bsoncxx::exception

if this element is not a b_decimal128.

Returns

the element's value.

types::b_document bsoncxx::document::element::get_document

(

)

const

Getter for elements of the b_document type.

Exceptions

bsoncxx::exception

if this element is not a b_document.

Returns

the element's value.

types::b_double bsoncxx::document::element::get_double

(

)

const

Getter for elements of the b_double type.

Exceptions

bsoncxx::exception

if this element is not a b_double.

Returns

the element's value.

types::b_int32 bsoncxx::document::element::get_int32

(

)

const

Getter for elements of the b_int32 type.

Exceptions

bsoncxx::exception

if this element is not a b_int32.

Returns

the element's value.

types::b_int64 bsoncxx::document::element::get_int64

(

)

const

Getter for elements of the b_int64 type.

Exceptions

bsoncxx::exception

if this element is not a b_int64.

Returns

the element's value.

types::b_maxkey bsoncxx::document::element::get_maxkey

(

)

const

Getter for elements of the b_maxkey type.

Exceptions

bsoncxx::exception

if this element is not a b_maxkey.

Returns

the element's value.

types::b_minkey bsoncxx::document::element::get_minkey

(

)

const

Getter for elements of the b_minkey type.

Exceptions

bsoncxx::exception

if this element is not a b_minkey.

Returns

the element's value.

types::b_null bsoncxx::document::element::get_null

(

)

const

Getter for elements of the b_null type.

Exceptions

bsoncxx::exception

if this element is not a b_null.

Returns

the element's value.

types::b_oid bsoncxx::document::element::get_oid

(

)

const

Getter for elements of the b_oid type.

Exceptions

bsoncxx::exception

if this element is not a b_oid.

Returns

the element's value.

types::b_regex bsoncxx::document::element::get_regex

(

)

const

Getter for elements of the b_regex type.

Exceptions

bsoncxx::exception

if this element is not a b_regex.

Returns

the element's value.

types::b_symbol bsoncxx::document::element::get_symbol

(

)

const

Getter for elements of the b_symbol type.

Exceptions

bsoncxx::exception

if this element is not a b_symbol.

Returns

the element's value.

types::b_timestamp bsoncxx::document::element::get_timestamp

(

)

const

Getter for elements of the b_timestamp type.

Exceptions

bsoncxx::exception

if this element is not a b_timestamp.

Returns

the element's value.

types::b_undefined bsoncxx::document::element::get_undefined

(

)

const

Getter for elements of the b_undefined type.

Exceptions

bsoncxx::exception

if this element is not a b_undefined.

Returns

the element's value.

types::b_utf8 bsoncxx::document::element::get_utf8

(

)

const

Getter for elements of the b_utf8 type.

Exceptions

bsoncxx::exception

if this element is not a b_utf8.

Returns

the element's value.

types::value bsoncxx::document::element::get_value

(

)

const

Getter for a types::value variant wrapper of the value portion of the element.

Returns

the element's value.

stdx::string_view bsoncxx::document::element::key

(

)

const

Getter for the element's key.

Returns

the element's key.

Exceptions

bsoncxx::exception

if this element is invalid.

std::uint32_t bsoncxx::document::element::length

(

)

const

Getter for length of the raw bson bytes the element points to.

Returns

a pointer to the length of the raw bson bytes.

void bsoncxx::document::element::length

(

std::uint32_t

length

)

Setter for length of the raw bson bytes the element points to.

Parameters

length

The length of the bytes this element points to.

std::uint32_t bsoncxx::document::element::offset

(

)

const

Getter for the offset into the raw bson bytes the element points to.

Returns

the offset into the raw bson bytes.

void bsoncxx::document::element::offset

(

std::uint32_t

offset

)

Setter for the offset into the raw bson bytes the element points to.

Parameters

offset

The offset into the bytes this element points to.

element bsoncxx::document::element::operator[]

(

stdx::string_view

key

)

const

If this element is a document, finds the first element of the document with the provided key.

If there is no such element, an invalid document::element will be returned. The runtime of operator[] is linear in the length of the document.

If this element is not a document, an invalid document::element will be returned.

Parameters

key	The key to search for.

Returns

The matching element, if found, or an invalid element.

array::element bsoncxx::document::element::operator[]

(

std::uint32_t

i

)

const

If this element is an array, indexes into this BSON array.

If the index is out-of-bounds, an invalid array::element will be returned. As BSON represents arrays as documents, the runtime of operator[] is linear in the length of the array.

If this element is not an array, an invalid array::element will be returned.

Parameters

i	The index of the element.

Returns

The element if it exists, or an invalid element.

const std::uint8_t* bsoncxx::document::element::raw

(

)

const

Getter for the raw bson bytes the element points to.

Returns

a pointer to the raw bson bytes.

void bsoncxx::document::element::raw

(

const std::uint8_t *

raw

)

Setter for the raw bson bytes the element points to.

Parameters

raw	The bytes this element should point to.

bsoncxx::type bsoncxx::document::element::type

(

)

const

Getter for the type of the element.

Returns

the element's type.

Exceptions

bsoncxx::exception

if this element is invalid.

---

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

• src/bsoncxx/document/element.hpp