bsoncxx::document::view Class Reference

A read-only, non-owning view of a BSON document. More...

#include <view.hpp>

Classes
class	const_iterator
	A const iterator over the contents of a document view. More...

Public Member Functions
	view ()
	Default constructs a view. More...
	view (const std::uint8_t *data, std::size_t length)
	Constructs a view from a buffer. More...
const_iterator	cbegin () const
const_iterator	cend () const
const_iterator	begin () const
const_iterator	end () const
const_iterator	find (stdx::string_view key) const
	Finds the first element of the document with the provided key. More...
element	operator[] (stdx::string_view key) const
	Finds the first element of the document with the provided key. More...
const std::uint8_t *	data () const
	Access the raw bytes of the underlying document. More...
std::size_t	length () const
	Gets the length of the underlying buffer. More...
bool	empty () const
	Checks if the underlying document is empty, i.e. More...
bool	operator== (view, view)
	Compare two document views for (in)-equality.
bool	operator!= (view, view)
	Compare two document views for (in)-equality.

Detailed Description

A read-only, non-owning view of a BSON document.

Constructor & Destructor Documentation

view() [1/2]

bsoncxx::document::view::view

(

)

Default constructs a view.

The resulting view will be initialized to point at an empty BSON document.

view() [2/2]

bsoncxx::document::view::view	(	const std::uint8_t *	data,
		std::size_t	length
	)

Constructs a view from a buffer.

The caller is responsible for ensuring that the lifetime of the resulting view is a subset of the buffer's.

Parameters

data	A buffer containing a valid BSON document.
length	The size of the buffer, in bytes.

Member Function Documentation

begin()

const_iterator bsoncxx::document::view::begin

(

)

const

Returns

A const_iterator to the first element of the document.

cbegin()

const_iterator bsoncxx::document::view::cbegin

(

)

const

Returns

A const_iterator to the first element of the document.

cend()

const_iterator bsoncxx::document::view::cend

(

)

const

Returns

A const_iterator to the past-the-end element of the document.

data()

const std::uint8_t* bsoncxx::document::view::data

(

)

const

Access the raw bytes of the underlying document.

Returns

A (non-owning) pointer to the view's buffer.

empty()

bool bsoncxx::document::view::empty

(

)

const

Checks if the underlying document is empty, i.e.

it is equivalent to the trivial document '{}'.

Returns

true if the underlying document is empty.

end()

const_iterator bsoncxx::document::view::end

(

)

const

Returns

A const_iterator to the past-the-end element of the document.

find()

const_iterator bsoncxx::document::view::find

(

stdx::string_view

key

)

const

Finds the first element of the document with the provided key.

If there is no such element, the past-the-end iterator will be returned. The runtime of find() is linear in the length of the document. This method only searches the top-level document, and will not recurse to any subdocuments.

Remarks

In BSON, keys are not required to be unique. If there are multiple elements with a matching key in the document, the first matching element from the start will be returned.

Parameters

key	The key to search for.

Returns

An iterator to the matching element, if found, or the past-the-end iterator.

length()

std::size_t bsoncxx::document::view::length

(

)

const

Gets the length of the underlying buffer.

Remarks

This is not the number of elements in the document. To compute the number of elements, use std::distance.

Returns

The length of the document, in bytes.

operator[]()

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

(

stdx::string_view

key

)

const

Finds the first element of the document with the provided key.

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

Parameters

key	The key to search for.

Returns

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

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

• src/bsoncxx/document/view.hpp