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MnaGraph

Namespace: MNALIB  ·  Library: MNA Library

#include <mna/mna_graph.h>

class MNALIB::MnaGraph

Directed acyclic graph of processing nodes forming a computational pipeline.

In-memory DAG of MnaNode operations with validation, topological sort and JSON/CBOR persistence.

src/examples/ex_mna/main.cpp
MnaGraph graph;
MnaNode source;
source.id = "source";
source.opType = "ex_constant";
source.attributes["value"] = 3.0;
const MnaPort sourceOut = port("out", MnaPortDir::Output); // name, data kind, direction
source.outputs.append(sourceOut);
graph.addNode(source);

for (const QString& id : {QStringLiteral("scale"), QStringLiteral("shift")}) {
    MnaNode node;
    node.id = id;
    node.opType = "ex_affine";
    node.inputs.append(port("in", MnaPortDir::Input));
    node.outputs.append(port("out", MnaPortDir::Output));
    graph.addNode(node);
}
graph.node("scale").attributes["gain"] = 2.0;
graph.connect("source", "out", "scale", "in");
graph.connect("scale", "out", "shift", "in");

Public Methods​

MnaGraph()​

addNode(node)​

removeNode(nodeId)​

node(nodeId)​

node(nodeId)​

nodes()​

nodes()​

hasNode(nodeId)​

connect(srcNodeId, srcPortName, dstNodeId, dstPortName)​

Connect output port of srcNode to input port of dstNode.

Sets the sourceNodeId and sourcePortName on the destination input port.

Parameters:

  • srcNodeId : const QString & Id of the node providing the output.

  • srcPortName : const QString & Name of the output port on the source node.

  • dstNodeId : const QString & Id of the node receiving the input.

  • dstPortName : const QString & Name of the input port on the destination node.

Returns:

  • bool — true if connection was made, false if ports not found.

validate(errors)​

Validate the graph: acyclicity, port connections, data-kind compatibility, op schema compliance, required attributes.

Parameters:

  • errors : *QStringList ** Optional list to receive error messages.

Returns:

  • bool — true if valid.

topologicalSort()​

upstreamNodes(nodeId)​

downstreamNodes(nodeId)​

dirtyNodes()​

toJson()​

toCbor()​

Static Methods​

fromJson(json)​

fromCbor(cbor)​

Example​

Used in examples​

ex_mna​

MNA library: register operations, build and run a graph, bind parameters and save a project.

src/examples/ex_mna/main.cpp, line 115
MnaGraph graph;
MnaNode source;
source.id = "source";
source.opType = "ex_constant";
source.attributes["value"] = 3.0;
const MnaPort sourceOut = port("out", MnaPortDir::Output); // name, data kind, direction
source.outputs.append(sourceOut);
graph.addNode(source);

Authors of this file​