npl: npls more conveniently instantiable

NPLs can now be instantiated using brace-init lists, as well as by passing
any iterator-capable container.

refs: #4345

Change-Id: Ib43373d5899d0ac14861027c34431fa928eec191
diff --git a/src/name-prefix-list.hpp b/src/name-prefix-list.hpp
index 8351b3b..0912fb3 100644
--- a/src/name-prefix-list.hpp
+++ b/src/name-prefix-list.hpp
@@ -40,6 +40,18 @@
 
   NamePrefixList();
 
+  NamePrefixList(const std::initializer_list<ndn::Name>& names);
+
+  NamePrefixList(const std::initializer_list<NamePrefixList::NamePair>& namesAndSources);
+
+  template<class ContainerType>
+  NamePrefixList(const ContainerType& names)
+  {
+    for (const auto& elem : names) {
+      m_names.push_back(NamePair{elem, {""}});
+    }
+  }
+
   ~NamePrefixList();
 
   /*! \brief inserts name into NamePrefixList