follows and precedes function templates
To enable this feature, define the
TBB_PREVIEW_FLOW_GRAPH_FEATURES
macro to 1.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));