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Example custom interval demonstrates how to use interval containers with an own interval class type.
#include <iostream> #include <boost/icl/interval_set.hpp> using namespace std; using namespace boost::icl; // Here is a typical class that may model intervals in your application. class MyInterval { public: MyInterval(): _first(), _past(){} MyInterval(int lo, int up): _first(lo), _past(up){} int first()const{ return _first; } int past ()const{ return _past; } private: int _first, _past; }; namespace boost{ namespace icl { // Class template interval_traits serves as adapter to register and customize your interval class template<> struct interval_traits< MyInterval > //1. Partially specialize interval_traits for { // your class MyInterval //2. Define associated types typedef MyInterval interval_type; //2.1 MyInterval will be the interval_type typedef int domain_type; //2.2 The elements of the domain are ints typedef std::less<int> domain_compare; //2.3 This is the way our element shall be ordered. //3. Next we define the essential functions // of the specialisation //3.1 Construction of intervals static interval_type construct(const domain_type& lo, const domain_type& up) { return interval_type(lo, up); } //3.2 Selection of values static domain_type lower(const interval_type& inter_val){ return inter_val.first(); }; static domain_type upper(const interval_type& inter_val){ return inter_val.past(); }; }; template<> struct interval_bound_type<MyInterval> //4. Finally we define the interval borders. { // Choose between static_open (lo..up) typedef interval_bound_type type; // static_left_open (lo..up] BOOST_STATIC_CONSTANT(bound_type, value = interval_bounds::static_right_open); }; // and static_closed [lo..up] }} // namespace boost icl void custom_interval() { // Now we can use class MyInterval with interval containers: typedef interval_set<int, std::less, MyInterval> MyIntervalSet; MyIntervalSet mySet; mySet += MyInterval(1,9); cout << mySet << endl; mySet.subtract(3) -= 6; cout << mySet << " subtracted 3 and 6\n"; mySet ^= MyInterval(2,8); cout << mySet << " flipped between 2 and 7\n"; } int main() { cout << ">>Interval Container Library: Sample custom_interval.cpp <<\n"; cout << "-----------------------------------------------------------\n"; cout << "This program uses a user defined interval class:\n"; custom_interval(); return 0; } // Program output: /*----------------------------------------------------------------------------- >>Interval Container Library: Sample custom_interval.cpp << ----------------------------------------------------------- This program uses a user defined interval class: {[1, 9)} {[1, 3) [4, 6) [7, 9)} subtracted 3 and 6 {[1,2) [3,4) [6,7) [8,9)} flipped between 2 and 7 -----------------------------------------------------------------------------*/