CXX-739 Add comparison operators to bsoncxx::view_or_value

Author: samantharitter

src/bsoncxx/view_or_value.hpp

@@ -127,6 +127,22 @@ class view_or_value {
     View _view;
 };
 
+///
+/// Compare view_or_value objects.
+///
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator==(const view_or_value<View, Value>& lhs,
+                               const view_or_value<View, Value>& rhs) {
+    return lhs.view() == rhs.view();
+}
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator!=(const view_or_value<View, Value>& lhs,
+                               const view_or_value<View, Value>& rhs) {
+    return !(lhs == rhs);
+}
+
 ///
 /// Equality operators for comparison with plain Views.
 ///
@@ -151,6 +167,30 @@ BSONCXX_INLINE bool operator!=(View lhs, const view_or_value<View, Value>& rhs)
     return !(rhs == lhs);
 }
 
+///
+/// Equality operators for comparison with plain Values.
+///
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator==(const view_or_value<View, Value>& lhs, const Value& rhs) {
+    return lhs.view() == View(rhs);
+}
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator==(const Value& lhs, const view_or_value<View, Value>& rhs) {
+    return rhs == lhs;
+}
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator!=(const view_or_value<View, Value>& lhs, const Value& rhs) {
+    return !(lhs == rhs);
+}
+
+template <typename View, typename Value>
+BSONCXX_INLINE bool operator!=(const Value& lhs, const view_or_value<View, Value>& rhs) {
+    return !(rhs == lhs);
+}
+
 BSONCXX_INLINE_NAMESPACE_END
 }  // namespace bsoncxx