.. _constructors_for_fg_nodes:
Constructors for Flow Graph nodes
=================================
.. note::
To enable this feature, define the ``TBB_PREVIEW_FLOW_GRAPH_FEATURES`` macro to 1.
.. contents::
:local:
:depth: 1
Description
***********
The "Helper Functions for Expressing Graphs" feature adds a set of new constructors
that can be used to construct a node that ``follows`` or ``precedes`` a set of nodes.
Where possible, the constructors support Class Template Argument Deduction (since C++17).
API
***
Header
------
.. code:: cpp
#include <oneapi/tbb/flow_graph.h>
Syntax
------
.. code:: cpp
// continue_node
continue_node(follows(...), Body body, Policy = Policy());
continue_node(precedes(...), Body body, Policy = Policy());
continue_node(follows(...), int number_of_predecessors, Body body, Policy = Policy());
continue_node(precedes(...), int number_of_predecessors, Body body, Policy = Policy());
// function_node
function_node(follows(...), std::size_t concurrency, Policy = Policy());
function_node(precedes(...), std::size_t concurrency, Policy = Policy());
// input_node
input_node(precedes(...), body);
// multifunction_node
multifunction_node(follows(...), std::size_t concurrency, Body body);
multifunction_node(precedes(...), std::size_t concurrency, Body body);
// async_node
async_node(follows(...), std::size_t concurrency, Body body);
async_node(precedes(...), std::size_t concurrency, Body body);
// overwrite_node
explicit overwrite_node(follows(...));
explicit overwrite_node(precedes(...));
// write_once_node
explicit write_once_node(follows(...));
explicit write_once_node(precedes(...));
// buffer_node
explicit buffer_node(follows(...));
explicit buffer_node(precedes(...));
// queue_node
explicit queue_node(follows(...));
explicit queue_node(precedes(...));
// priority_queue_node
explicit priority_queue_node(follows(...), const Compare& comp = Compare());
explicit priority_queue_node(precedes(...), const Compare& compare = Compare());
// sequencer_node
sequencer_node(follows(...), const Sequencer& s);
sequencer_node(precedes(...), const Sequencer& s);
// limiter_node
limiter_node(follows(...), std::size_t threshold);
limiter_node(precedes(...), std::size_t threshold);
// broadcast_node
explicit broadcast_node(follows(...));
explicit broadcast_node(precedes(...));
// join_node
explicit join_node(follows(...), Policy = Policy());
explicit join_node(precedes(...), Policy = Policy());
// split_node
explicit split_node(follows(...));
explicit split_node(precedes(...));
// indexer_node
indexer_node(follows(...));
indexer_node(precedes(...));
See Also
********
:ref:`follows_precedes`
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