CODEWITHSUNDEEP
c++boostboost-icl
Roman Rdgz
Roman Rdgz

Reputation: 13254

Iterating boost::icl::interval_set

I am iterating a boost interval_set<unsigned_int>, and I was expecting each iterator to be a boost interval, whose values would be accessed with the upper and lower methods:

boost::icl::interval_set<unsigned int> outages;
// ...
// Insert intervals into the database
for(boost::icl::interval_set<unsigned int>::iterator it =
    outages.begin(); it != outages.end(); it++){

    DATA_ACQUISITION::InsertInterval(db, it->lower(),
        it->upper())
}

But I am receiving errors at both lower and upper methods: Method ... could not be resolved, which suggests me that the iterator is not pointing to an interval at all.

So, what am I really iterating here? How to iterate though the intervals inserted into the interval_set?

EDIT: Adding SSCCE:

#include <boost/icl/interval_set.hpp>
#include <iostream>
#include <vector>


int main() {
    boost::icl::interval_set<unsigned int> outages;
    for(unsigned int i=0; i<5; i++){
        outages += boost::icl::discrete_interval<unsigned int>::closed(
            (i*10), ((i*10) + 5));
    }

    for(boost::icl::interval_set<unsigned int>::iterator it =
        outages.begin(); it != outages.end(); it++){

        std::cout << it->lower() << boost::icl::upper(*it);
    }
    return 0;
}

Additional info:

Upvotes: 5

Views: 4256

Answers (2)

Roman Rdgz
Roman Rdgz

Reputation: 13254

Finally, I realised that the errors where not from compilation but from Eclipse CDT, and have no effect at all.

Upvotes: 1

sehe
sehe

Reputation: 392911

In latest boost, at least, this is no issue:

Live On Coliru

#include <boost/icl/interval_set.hpp>
#include <iostream>

int main() {
    typedef boost::icl::interval_set<unsigned int> set_t;
    typedef set_t::interval_type ival;
    set_t outages;

    outages.insert(ival::closed(1,1));
    outages.insert(ival::open(7,10));
    outages.insert(ival::open(8,11));
    outages.insert(ival::open(90,120));

    for(set_t::iterator it = outages.begin(); it != outages.end(); it++){
        std::cout << it->lower() << ", " << it->upper() << "\n";
    }
}

Prints

1, 1
7, 11
90, 120

If older boost versions don't directly support the members, try the free functions:

std::cout << lower(*it) << ", " << upper(*it) << "\n";

Here, ADL finds the overloads declared in the boost::icl namespace

Upvotes: 10

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