A class for writing large lists of strings to disk with an associated index file for fast random access. More...

Public Member Functions
	string_list_writer (const std::string &path, uint64_t size)
	Constructs the writer, writing the string file to the given path. More...

	string_list_writer (string_list_writer &&)
	May be move constructed.

string_list_writer &	operator= (string_list_writer &&)
	May be move assigned.

void	insert (uint64_t idx, const std::string &elem)
	Sets the string at idx to be elem. More...

Private Types
using	ofstream = std::unique_ptr< std::ofstream >
	workaround for lack of move operators for gcc 4.8

Private Member Functions
std::ofstream &	file ()

ofstream	make_file (const std::string &path)

Private Attributes
std::mutex	mutex_
	Writes are internally synchronized.

ofstream	string_file_
	The file containing the strings.

uint64_t	write_pos_
	Keeps track of the write position.

util::disk_vector< uint64_t >	index_
	Index vector—stores byte positions.

Detailed Description

A class for writing large lists of strings to disk with an associated index file for fast random access.

This class is used for writing the output format read by the string_list class.

Constructor & Destructor Documentation

meta::index::string_list_writer::string_list_writer	(	const std::string &	path,
		uint64_t	size
	)

Constructs the writer, writing the string file to the given path.

The index file will go alongside that path.

Parameters

path	The path to write the string file to.
size	The number of strings in the list (must be known)

void meta::index::string_list_writer::insert	(	uint64_t	idx,
		const std::string &	elem
	)

Sets the string at idx to be elem.

Parameters

idx
elem

std::ofstream& meta::index::string_list_writer::file ( )

inlineprivate

ofstream meta::index::string_list_writer::make_file ( const std::string & path )

inlineprivate

Parameters

path	The path to the file

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