sched: fix compilation issue for gcc4.8

srsenb/hdr/stack/mac/sched_common.h

@@ -88,14 +88,12 @@ using prbmask_t = srslte::bounded_bitset<100, true>;
 struct prb_interval;
 struct rbg_interval : public srslte::interval<uint32_t> {
   using interval::interval;
-  rbg_interval(srslte::interval<uint32_t> i) : interval(i) {}
   static rbg_interval rbgmask_to_rbgs(const rbgmask_t& mask);
 };
 
 //! Struct to express a {min,...,max} range of PRBs
 struct prb_interval : public srslte::interval<uint32_t> {
   using interval::interval;
-  prb_interval(srslte::interval<uint32_t> i) : interval(i) {}
   static prb_interval rbgs_to_prbs(const rbg_interval& rbgs, uint32_t cell_nof_prb);
   static prb_interval riv_to_prbs(uint32_t riv, uint32_t nof_prbs, int nof_vrbs = -1);
 };

srsenb/src/stack/mac/schedulers/sched_base.cc

@@ -18,10 +18,12 @@ namespace srsenb {
  * Common UL/DL Helper methods
  ********************************/
 
-template <size_t N>
+template <typename RBMask,
-srslte::interval<uint32_t> find_contiguous_interval(const srslte::bounded_bitset<N, true>& in_mask, uint32_t max_size)
+          typename RBInterval =
+              typename std::conditional<std::is_same<RBMask, prbmask_t>::value, prb_interval, rbg_interval>::type>
+RBInterval find_contiguous_interval(const RBMask& in_mask, uint32_t max_size)
 {
-  srslte::interval<uint32_t> interv, max_interv;
+  RBInterval interv, max_interv;
 
   for (uint32_t n = 0; n < in_mask.size() and interv.length() < max_size; n++) {
     if (not in_mask.test(n) and interv.empty()) {