String Functions

Functions
bool	wpi::nt::SetString (NT_Handle pubentry, std::string_view value, int64_t time=0)
	Publish a new value.
bool	wpi::nt::SetDefaultString (NT_Handle pubentry, std::string_view defaultValue)
	Publish a default value.
std::string	wpi::nt::GetString (NT_Handle subentry, std::string_view defaultValue)
	Get the last published value.
TimestampedString	wpi::nt::GetAtomicString (NT_Handle subentry, std::string_view defaultValue)
	Get the last published value along with its timestamp.
std::vector< TimestampedString >	wpi::nt::ReadQueueString (NT_Handle subentry)
	Get an array of all value changes since the last call to ReadQueue.
std::vector< std::string >	wpi::nt::ReadQueueValuesString (NT_Handle subentry)
	Get an array of all value changes since the last call to ReadQueue.
std::string_view	wpi::nt::GetString (NT_Handle subentry, wpi::util::SmallVectorImpl< char > &buf, std::string_view defaultValue)
TimestampedStringView	wpi::nt::GetAtomicString (NT_Handle subentry, wpi::util::SmallVectorImpl< char > &buf, std::string_view defaultValue)

Detailed Description

Function Documentation

GetAtomicString() [1/2]

TimestampedString wpi::nt::GetAtomicString	(	NT_Handle	subentry,
		std::string_view	defaultValue )

Get the last published value along with its timestamp.

If no value has been published, returns the passed defaultValue and a timestamp of 0.

Parameters

subentry	subscriber or entry handle
defaultValue	default value to return if no value has been published

Returns

timestamped value

GetAtomicString() [2/2]

TimestampedStringView wpi::nt::GetAtomicString	(	NT_Handle	subentry,
		wpi::util::SmallVectorImpl< char > &	buf,
		std::string_view	defaultValue )

GetString() [1/2]

std::string wpi::nt::GetString	(	NT_Handle	subentry,
		std::string_view	defaultValue )

Get the last published value.

If no value has been published, returns the passed defaultValue.

Parameters

subentry	subscriber or entry handle
defaultValue	default value to return if no value has been published

Returns

value

GetString() [2/2]

std::string_view wpi::nt::GetString	(	NT_Handle	subentry,
		wpi::util::SmallVectorImpl< char > &	buf,
		std::string_view	defaultValue )

ReadQueueString()

std::vector< TimestampedString > wpi::nt::ReadQueueString

(

NT_Handle

subentry

)

Get an array of all value changes since the last call to ReadQueue.

Also provides a timestamp for each value.

Note

The "poll storage" subscribe option can be used to set the queue depth.

Parameters

subentry

subscriber or entry handle

Returns

Array of timestamped values; empty array if no new changes have been published since the previous call.

ReadQueueValuesString()

std::vector< std::string > wpi::nt::ReadQueueValuesString

(

NT_Handle

subentry

)

Get an array of all value changes since the last call to ReadQueue.

Note

The "poll storage" subscribe option can be used to set the queue depth.

Parameters

subentry

subscriber or entry handle

Returns

Array of values; empty array if no new changes have been published since the previous call.

SetDefaultString()

bool wpi::nt::SetDefaultString	(	NT_Handle	pubentry,
		std::string_view	defaultValue )

Publish a default value.

On reconnect, a default value will never be used in preference to a published value.

Parameters

pubentry	publisher or entry handle
defaultValue	default value

SetString()

bool wpi::nt::SetString	(	NT_Handle	pubentry,
		std::string_view	value,
		int64_t	time = 0 )

Publish a new value.

Parameters

pubentry	publisher or entry handle
value	value to publish
time	timestamp; 0 indicates current NT time should be used