Represents [wildcard] subscription to all events of the specific event type. More...

#include <WildcardSymbol.hpp>

Public Member Functions
void *	toGraal () const noexcept
	Allocates memory for the dxFeed Graal SDK structure (recursively if necessary).

std::string	toString () const noexcept
	Returns string representation of this wildcard subscription symbol.

Static Public Member Functions
static void	freeGraal (void *graalNative) noexcept
	Releases the memory occupied by the dxFeed Graal SDK structure (recursively if necessary).

Static Public Attributes
static const std::string	RESERVED_PREFIX = "*"
	Symbol prefix that is reserved for wildcard subscriptions.

static const WildcardSymbol	ALL {RESERVED_PREFIX}
	Represents [wildcard] subscription to all events of the specific event type.

Detailed Description

Represents [wildcard] subscription to all events of the specific event type.

The WildcardSymbol::ALL constant can be added to any DXFeedSubscription instance with addSymbols method to the effect of subscribing to all possible event symbols. The corresponding subscription will start receiving all published events of the corresponding types.

Member Function Documentation

◆ freeGraal()

void dxfcpp::WildcardSymbol::freeGraal ( void * graalNative )

staticnoexcept

Releases the memory occupied by the dxFeed Graal SDK structure (recursively if necessary).

Parameters

graalNative The pointer to the dxFeed Graal SDK structure.

◆ toGraal()

void * dxfcpp::WildcardSymbol::toGraal ( ) const

noexcept

Allocates memory for the dxFeed Graal SDK structure (recursively if necessary).

Fills the dxFeed Graal SDK structure's fields by the data of the current entity (recursively if necessary). Returns the pointer to the filled structure.

Returns: The pointer to the filled dxFeed Graal SDK structure

◆ toString()

std::string dxfcpp::WildcardSymbol::toString ( ) const

inlinenoexcept

Returns string representation of this wildcard subscription symbol.

Returns: string representation of this wildcard subscription symbol.

Member Data Documentation

◆ ALL

const WildcardSymbol dxfcpp::WildcardSymbol::ALL {RESERVED_PREFIX}

static

Represents [wildcard] subscription to all events of the specific event type.

NOTE: Wildcard subscription can create extremely high network and CPU load for certain kinds of high-frequency events like quotes. It requires a special arrangement on the side of upstream data provider and is disabled by default in upstream feed configuration. Make that sure you have adequate resources and understand the impact before using it. It can be used for low-frequency events only (like Forex quotes), because each instance of DXFeedSubscription processes events in a single thread and there is no provision to load-balance wildcard subscription amongst multiple threads. Contact your data provider for the corresponding configuration arrangement if needed.

See also: WildcardSymbol

◆ RESERVED_PREFIX

const std::string dxfcpp::WildcardSymbol::RESERVED_PREFIX = "*"

static

Symbol prefix that is reserved for wildcard subscriptions.

Any subscription starting with "*" is ignored with the exception of WildcardSymbol subscription.

Public Member Functions

Static Public Member Functions

Static Public Attributes