Boost set default edge weight to one

Question

I am trying to use Boost's graph algorithms (djikstra, bfs etc) and I want the edge weights to be one by default, without having to set them every time I add edges. Is that possible?

Answer 1

Use a weigh_map of static_property_map:

This property map wraps a copy of some particular object, and returns a copy of that object whenever a key object is input.

template <typename KeyType, typename ValueType>
    static_property_map<KeyType, ValueType>
    make_static_property_map(const ValueType& value);

So boost::make_static_property_map(1) would be enough to use as weight map argument to either of those algorithms.

In case you want default values, with possible exceptions, use e.g. function_property_map to do the evaluation.