fix some clang C++20 conversion issues

Signed-off-by: Ralph J. Steinhagen <[email protected]>

include/tag.hpp

@@ -56,8 +56,25 @@ using property_map = std::map<std::string, pmtv::pmt, detail::transparent_less>;
  * so that there is only one tag per scheduler iteration. Multiple tags on the same sample shall be merged to one.
  */
 struct alignas(hardware_constructive_interference_size) tag_t {
-    std::make_signed_t<std::size_t> index = 0;
-    property_map                    map;
+    using signed_index_type = std::make_signed_t<std::size_t>;
+    signed_index_type index{ 0 };
+    property_map      map{};
+
+    tag_t() = default;
+
+    tag_t(signed_index_type index, property_map map_) noexcept : index(index), map(std::move(map_)) {}
+
+    tag_t(const tag_t &other) = default;
+
+    tag_t &
+    operator=(const tag_t &other)
+            = default;
+
+    tag_t(tag_t &&other) noexcept = default;
+
+    tag_t &
+    operator=(tag_t &&other) noexcept
+            = default;
 
     bool
     operator==(const tag_t &other) const

test/qa_tags.cpp

@@ -30,7 +30,7 @@ const boost::ut::suite TagTests = [] {
     };
 
     "DefaultTags"_test = [] {
-        tag_t testTag;
+        tag_t testTag{};
 
         testTag.insert_or_assign(tag::SAMPLE_RATE, pmtv::pmt(3.0f));
         testTag.insert_or_assign(tag::SAMPLE_RATE(4.0f));