paged_vecvec::insert, generic vecvec::view

include/cista/containers/paged_vecvec.h

@@ -323,6 +323,16 @@ struct paged_vecvec {
     return emplace_back(std::string_view{s});
   }
 
+  template <typename Container,
+            typename = std::enable_if_t<std::is_convertible_v<
+                decltype(*std::declval<Container>().begin()), data_value_type>>>
+  void insert(Key const& k, Container&& bucket) {
+    auto p = paged_.create_page(
+        static_cast<typename Paged::page_size_type>(bucket.size()));
+    paged_.copy(p, std::begin(bucket), std::end(bucket));
+    idx_.insert(idx_.begin() + to_idx(k), p);
+  }
+
   void resize(size_type const size) {
     for (auto i = size; i < idx_.size(); ++i) {
       paged_.free_page(idx_[i]);

include/cista/containers/vecvec.h

@@ -34,9 +34,9 @@ struct basic_vecvec {
     data_value_type const* data() const { return empty() ? nullptr : &front(); }
 
     template <typename T = std::decay_t<data_value_type>,
-              typename Traits = std::char_traits<T>>
-    std::basic_string_view<T, Traits> view() const {
-      return std::basic_string_view<T, Traits>{begin(), size()};
+              typename = std::enable_if_t<std::is_trivially_copyable_v<T>>>
+    std::basic_string_view<T> view() const {
+      return {begin(), size()};
     }
 
     value_type& front() {
@@ -191,9 +191,9 @@ struct basic_vecvec {
     data_value_type const* data() const { return empty() ? nullptr : &front(); }
 
     template <typename T = std::decay_t<data_value_type>,
-              typename = std::enable_if_t<std::is_same_v<T, char>>>
-    std::string_view view() const {
-      return std::string_view{begin(), size()};
+              typename = std::enable_if_t<std::is_trivially_copyable_v<T>>>
+    std::basic_string_view<T> view() const {
+      return {begin(), size()};
     }
 
     value_type const& front() const {