Workaround for Hipcc error (reference to host function in host device function) (#1754)

* Fix weird Hipcc error

Author: franzpoeschel

include/openPMD/snapshots/RandomAccessIterator.hpp

@@ -62,14 +62,15 @@ class RandomAccessIterator
 
     ~RandomAccessIterator() override;
 
-    RandomAccessIterator(RandomAccessIterator const &other);
+    RandomAccessIterator(RandomAccessIterator const &other) = default;
     RandomAccessIterator(RandomAccessIterator &&other) noexcept(
-        noexcept(iterator_t(std::declval<iterator_t &&>())));
+        noexcept(iterator_t(std::declval<iterator_t &&>()))) = default;
 
-    RandomAccessIterator &operator=(RandomAccessIterator const &other);
     RandomAccessIterator &
-    operator=(RandomAccessIterator &&other) noexcept(noexcept(
-        std::declval<iterator_t>().operator=(std::declval<iterator_t &&>())));
+    operator=(RandomAccessIterator const &other) = default;
+    RandomAccessIterator &operator=(RandomAccessIterator &&other) noexcept(
+        noexcept(std::declval<iterator_t>().operator=(
+            std::declval<iterator_t &&>()))) = default;
 
     auto operator*() -> value_type &;
     auto operator*() const -> value_type const &;

src/snapshots/RandomAccessIterator.cpp

@@ -9,24 +9,6 @@ inline RandomAccessIterator<iterator_t>::RandomAccessIterator(iterator_t it)
 template <typename iterator_t>
 RandomAccessIterator<iterator_t>::~RandomAccessIterator() = default;
 
-template <typename iterator_t>
-RandomAccessIterator<iterator_t>::RandomAccessIterator(
-    RandomAccessIterator const &other) = default;
-template <typename iterator_t>
-RandomAccessIterator<iterator_t>::RandomAccessIterator(
-    RandomAccessIterator
-        &&other) noexcept(noexcept(iterator_t(std::declval<iterator_t &&>()))) =
-    default;
-template <typename iterator_t>
-RandomAccessIterator<iterator_t> &RandomAccessIterator<iterator_t>::operator=(
-    RandomAccessIterator const &other) = default;
-template <typename iterator_t>
-RandomAccessIterator<iterator_t> &RandomAccessIterator<iterator_t>::operator=(
-    RandomAccessIterator
-        &&other) noexcept(noexcept(std::declval<iterator_t>().
-                                   operator=(std::declval<iterator_t &&>()))) =
-    default;
-
 template <typename iterator_t>
 auto RandomAccessIterator<iterator_t>::operator*() -> value_type &
 {