.. _make_edges:
``make_edges`` function template
================================
.. note::
To enable this feature, define the ``TBB_PREVIEW_FLOW_GRAPH_FEATURES`` macro to 1.
.. contents::
:local:
:depth: 1
Description
***********
The ``make_edges`` function template creates edges between a single node
and each node in a set of nodes.
There are two ways to connect nodes in a set and a single node using
``make_edges``:
.. figure:: ./Resources/make_edges_usage.png
:align: center
API
***
Header
------
.. code:: cpp
#include <oneapi/tbb/flow_graph.h>
Syntax
------
.. code:: cpp
// node_set is an exposition-only name for the type returned from make_node_set function
template <typename NodeType, typename Node, typename... Nodes>
void make_edges(node_set<Node, Nodes...>& set, NodeType& node);
template <typename NodeType, typename Node, typename... Nodes>
void make_edges(NodeType& node, node_set<Node, Nodes...>& set);
Example
-------
The example implements the graph structure in the picture below.
.. figure:: ./Resources/make_edges_example.png
:align: center
.. code:: cpp
#define TBB_PREVIEW_FLOW_GRAPH_FEATURES 1
#include <oneapi/tbb/flow_graph.h>
int main() {
using namespace oneapi::tbb::flow;
graph g;
broadcast_node<int> input(g);
function_node doubler(g, unlimited, [](const int& i) { return 2 * i; });
function_node squarer(g, unlimited, [](const int& i) { return i * i; });
function_node cuber(g, unlimited, [](const int& i) { return i * i * i; });
buffer_node<int> buffer(g);
auto handlers = make_node_set(doubler, squarer, cuber);
make_edges(input, handlers);
make_edges(handlers, buffer);
for (int i = 1; i <= 10; ++i) {
input.try_put(i);
}
g.wait_for_all();
}
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