<commit_before>// Dynamically keeps track of the connected components in an
// undirected graph.
#include "sonLibGlobalsInternal.h"

// Data structures

struct _stConnectivity {
    // Data structure keeping track of the nodes, edges, and connected
    // components.
};

struct _stConnectedComponent {
    // Data structure representing a connected component. It's OK
    // if this just contains an ID that indexes into a different data
    // structure or something--no need to keep the actual connected
    // component structure in here.

    // If the graph is modified, you can safely assume that the
    // outside code has discarded all the pointers to connected
    // components (please provide a destructor function so that the
    // memory can be freed in that case).
};

struct _stConnectedComponentIterator {
    // Iterator data structure for components in the graph.
};

struct _stConnectedComponentNodeIterator {
    // Iterator for nodes in a component
};

// Exported methods

stConnectivity *stConnectivity_construct(void) {
    // Initialize the data structure with an empty graph with 0 nodes.
}

void stConnectivity_destruct(stConnectivity *connectivity) {
    // Free the memory for the data structure.
}

void stConnectivity_addNode(stConnectivity *connectivity, void *node) {
    // Add an isolated node to the graph. This should end up in a new
    // connected component with only one member.
}

void stConnectivity_addEdge(stConnectivity *connectivity, void *node1, void *node2) {
    // Add an edge to the graph and update the connected components.
    // NB: The ordering of node1 and node2 shouldn't matter as this is an undirected graph.
}

void stConnectivity_removeEdge(stConnectivity *connectivity, void *node1, void *node2) {
    // Remove an edge from the graph and update the connected components.
}

// Might be cool to be able to add or remove several edges at once, if there is a way to
// make that more efficient than adding them one at a time. Depends on the details of 
// the algorithm you use.

void stConnectivity_removeNode(stConnectivity *connectivity, void *node) {
    // Remove a node (and all its edges) from the graph and update the connected components.
}

stConnectedComponent *stConnectivity_getConnectedComponent(stConnectivity *connectivity, void *node) {
    // Get the connected component that this node is a member of. If
    // the graph is modified, this pointer can be invalidated
}

stConnectedComponentNodeIterator *stConnectedComponent_getNodeIterator(stConnectedComponent *component) {
    // Get an iterator over the nodes in a particular connected
    // component. You can safely assume that the graph won't be
    // modified while this iterator is active.
}

void *stConnectedComponentNodeIterator_getNext(stConnectedComponentNodeIterator *it) {
    // Return the next node of the connected component, or NULL if all have been traversed.
}

void *stConnectedComponentNodeIterator_destruct(stConnectedComponentNodeIterator *it) {
    // Free the iterator data structure.
}

stConnectedComponentIterator *stConnectivity_getConnectedComponentIterator(stConnectivity *connectivity) {
    // Get an iterator over the connected components in the
    // graph. Again, if the graph is modified while the iterator is
    // active, it's ok for it to break.
}

stConnectedComponent *stConnectedComponentIterator_getNext(stConnectedComponentIterator *it) {
    // Return the next connected component in the graph, or NULL if all have been traversed.
}

void *stConnectedComponentIterator_destruct(stConnectedComponentIterator *it) {
    // Free the iterator data structure.
}<commit_msg>whoops<commit_after>// Dynamically keeps track of the connected components in an
// undirected graph.
#include "sonLibGlobalsInternal.h"

// Data structures

struct _stConnectivity {
    // Data structure keeping track of the nodes, edges, and connected
    // components.
};

struct _stConnectedComponent {
    // Data structure representing a connected component. It's OK
    // if this just contains an ID that indexes into a different data
    // structure or something--no need to keep the actual connected
    // component structure in here.

    // If the graph is modified, you can safely assume that the
    // outside code has discarded all the pointers to connected
    // components (please provide a destructor function so that the
    // memory can be freed in that case).
};

struct _stConnectedComponentIterator {
    // Iterator data structure for components in the graph.
};

struct _stConnectedComponentNodeIterator {
    // Iterator for nodes in a component
};

// Exported methods

stConnectivity *stConnectivity_construct(void) {
    // Initialize the data structure with an empty graph with 0 nodes.
}

void stConnectivity_destruct(stConnectivity *connectivity) {
    // Free the memory for the data structure.
}

void stConnectivity_addNode(stConnectivity *connectivity, void *node) {
    // Add an isolated node to the graph. This should end up in a new
    // connected component with only one member.
}

void stConnectivity_addEdge(stConnectivity *connectivity, void *node1, void *node2) {
    // Add an edge to the graph and update the connected components.
    // NB: The ordering of node1 and node2 shouldn't matter as this is an undirected graph.
}

void stConnectivity_removeEdge(stConnectivity *connectivity, void *node1, void *node2) {
    // Remove an edge from the graph and update the connected components.
}

// Might be cool to be able to add or remove several edges at once, if there is a way to
// make that more efficient than adding them one at a time. Depends on the details of 
// the algorithm you use.

void stConnectivity_removeNode(stConnectivity *connectivity, void *node) {
    // Remove a node (and all its edges) from the graph and update the connected components.
}

stConnectedComponent *stConnectivity_getConnectedComponent(stConnectivity *connectivity, void *node) {
    // Get the connected component that this node is a member of. If
    // the graph is modified, this pointer can be invalidated
}

stConnectedComponentNodeIterator *stConnectedComponent_getNodeIterator(stConnectedComponent *component) {
    // Get an iterator over the nodes in a particular connected
    // component. You can safely assume that the graph won't be
    // modified while this iterator is active.
}

void *stConnectedComponentNodeIterator_getNext(stConnectedComponentNodeIterator *it) {
    // Return the next node of the connected component, or NULL if all have been traversed.
}

void stConnectedComponentNodeIterator_destruct(stConnectedComponentNodeIterator *it) {
    // Free the iterator data structure.
}

stConnectedComponentIterator *stConnectivity_getConnectedComponentIterator(stConnectivity *connectivity) {
    // Get an iterator over the connected components in the
    // graph. Again, if the graph is modified while the iterator is
    // active, it's ok for it to break.
}

stConnectedComponent *stConnectedComponentIterator_getNext(stConnectedComponentIterator *it) {
    // Return the next connected component in the graph, or NULL if all have been traversed.
}

void stConnectedComponentIterator_destruct(stConnectedComponentIterator *it) {
    // Free the iterator data structure.
}
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