Visible to Intel only — GUID: GUID-67CC22F0-2C10-43D0-BC23-D3D2A9789C97
Visible to Intel only — GUID: GUID-67CC22F0-2C10-43D0-BC23-D3D2A9789C97
follows and precedes function templates
The follows and precedes helper functions aid in expressing dependencies between nodes when building oneTBB flow graphs. These helper functions can only be used while constructing the node.
Description
The follows helper function specifies that the node being constructed is the successor of the set of nodes passed as an argument.
The precedes helper function specifies that the node being constructed is the predecessor of the set of nodes passed as an argument.
Functions follows and precedes are meant to replace the graph argument, which is passed as the first argument to the constructor of the node. The graph argument for the node being constructed is obtained either from the specified node set or the sequence of nodes passed to follows or precedes.
If the nodes passed to follows or precedes belong to different graphs, the behavior is undefined.
API
Header
#include <oneapi/tbb/flow_graph.h>
Syntax
// node_set is an exposition-only name for the type returned from make_node_set function template <typename NodeType, typename... NodeTypes> /*unspecified*/ follows( node_set<NodeType, NodeTypes...>& set ); template <typename NodeType, typename... NodeTypes> /*unspecified*/ follows( NodeType& node, NodeTypes&... nodes ); template <typename NodeType, typename... NodeTypes> /*unspecified*/ precedes( node_set<NodeType, NodeTypes...>& set ); template <typename NodeType, typename... NodeTypes> /*unspecified*/ precedes( NodeType& node, NodeTypes&... nodes );
Input Parameters
Either a set or a sequence of nodes can be used as arguments for follows and precedes. The following expressions are equivalent:
auto handlers = make_node_set(n1, n2, n3); broadcast_node<int> input(precedes(handlers));
broadcast_node<int> input(precedes(n1, n2, n3));