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some comments for dynamic_graph.hpp

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This commit is contained in:
Moritz Seemann 2017-01-11 16:49:44 +01:00
parent f896aaf881
commit f12fdeb23e
1 changed files with 12 additions and 2 deletions
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14
include/util/dynamic_graph.hpp
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@ -161,9 +161,13 @@ template <typename EdgeDataT> class DynamicGraph
EdgeIterator InsertEdge(const NodeIterator from, const NodeIterator to, const EdgeDataT &data)
{
Node &node = node_array[from];
EdgeIterator newFirstEdge = node.edges + node.first_edge;
if (newFirstEdge >= edge_list.size() || !isDummy(newFirstEdge))
EdgeIterator one_beyond_last_of_node = node.edges + node.first_edge;
// if we can't write at the end of this nodes edges
// that is: the end is the end of the edge_list,
// or the beginning of the next nodes edges
if (one_beyond_last_of_node == edge_list.size() || !isDummy(one_beyond_last_of_node))
{
// can we write before this nodes edges?
if (node.first_edge != 0 && isDummy(node.first_edge - 1))
{
node.first_edge--;
@ -171,20 +175,24 @@ template <typename EdgeDataT> class DynamicGraph
}
else
{
// we have to move this nodes edges to the end of the edge_list
EdgeIterator newFirstEdge = (EdgeIterator)edge_list.size();
unsigned newSize = node.edges * 1.1 + 2;
EdgeIterator requiredCapacity = newSize + edge_list.size();
EdgeIterator oldCapacity = edge_list.capacity();
// make sure there is enough space at the end
if (requiredCapacity >= oldCapacity)
{
edge_list.reserve(requiredCapacity * 1.1);
}
edge_list.resize(edge_list.size() + newSize);
// move the edges over and invalidate the old ones
for (const auto i : irange(0u, node.edges))
{
edge_list[newFirstEdge + i] = edge_list[node.first_edge + i];
makeDummy(node.first_edge + i);
}
// invalidate until the end of edge_list
for (const auto i : irange(node.edges + 1, newSize))
{
makeDummy(newFirstEdge + i);
@ -192,6 +200,8 @@ template <typename EdgeDataT> class DynamicGraph
node.first_edge = newFirstEdge;
}
}
// get the position for the edge that is to be inserted
// and write it
Edge &edge = edge_list[node.first_edge + node.edges];
edge.target = to;
edge.data = data;