Fix MSVC compilation

Author: franzpoeschel

include/openPMD/auxiliary/Future.hpp

@@ -59,6 +59,11 @@ class DeferredComputation
     std::variant<detail::OneTimeTask<T>, detail::CachedValue<T>> m_task;
 
 public:
+    static constexpr bool noexcept_move =
+        std::is_move_constructible_v<detail::OneTimeTask<T>> &&
+        std::is_move_assignable_v<detail::OneTimeTask<T>> &&
+        std::is_move_constructible_v<detail::CachedValue<T>> &&
+        std::is_move_assignable_v<detail::CachedValue<T>>;
     /** Construct from a callable
      *
      * @param task The callable to execute
@@ -72,10 +77,11 @@ class DeferredComputation
 
     explicit DeferredComputation();
 
-    DeferredComputation(DeferredComputation &&) noexcept;
+    DeferredComputation(DeferredComputation &&) noexcept(noexcept_move);
     DeferredComputation(DeferredComputation const &) = delete;
 
-    auto operator=(DeferredComputation &&) noexcept -> DeferredComputation &;
+    auto operator=(DeferredComputation &&) noexcept(noexcept_move)
+        -> DeferredComputation &;
     auto operator=(DeferredComputation const &)
         -> DeferredComputation & = delete;
 

src/auxiliary/Future.cpp

@@ -57,12 +57,12 @@ template <typename T>
 DeferredComputation<T>::DeferredComputation() = default;
 
 template <typename T>
-DeferredComputation<T>::DeferredComputation(DeferredComputation &&) noexcept =
-    default;
+DeferredComputation<T>::DeferredComputation(DeferredComputation &&) noexcept(
+    noexcept_move) = default;
 
 template <typename T>
-auto DeferredComputation<T>::operator=(DeferredComputation &&) noexcept
-    -> DeferredComputation & = default;
+auto DeferredComputation<T>::operator=(DeferredComputation &&) noexcept(
+    noexcept_move) -> DeferredComputation & = default;
 
 template <typename T>
 DeferredComputation<T>::~DeferredComputation()