msvc fixes

include/storage/block.hpp

@@ -14,8 +14,14 @@ namespace storage
 
 struct Block
 {
-    std::uint64_t num_entries = 0;
-    std::uint64_t byte_size = 0;
+    std::uint64_t num_entries;
+    std::uint64_t byte_size;
+
+    Block() : num_entries(0), byte_size(0) {}
+    Block(std::uint64_t num_entries, std::uint64_t byte_size)
+        : num_entries(num_entries), byte_size(byte_size)
+    {
+    }
 };
 
 using NamedBlock = std::tuple<std::string, Block>;

include/util/indexed_data.hpp

@@ -322,7 +322,9 @@ template <typename GroupBlockPolicy, storage::Ownership Ownership> struct Indexe
             auto to_bytes = [&](const auto &data) {
                 values_byte_iter = std::copy_n(&data, sizeof(ValueType), values_byte_iter);
             };
-            std::copy(data + *curr, data + *next, boost::make_function_output_iterator(to_bytes));
+            std::copy(data + *curr,
+                      data + *next,
+                      boost::make_function_output_iterator(std::cref(to_bytes)));
         }
     }