Added getters for Variable rank

mdio/variable.h

@@ -874,6 +874,12 @@ class Variable {
    */
   IndexDomainView<R> dimensions() const { return store.domain(); }
 
+  /**
+   * @brief Gets the rank of the variable.
+   * @return std::size_t The rank of the variable.
+   */
+  std::size_t rank() const { return store.rank(); }
+
   /**
    * @brief Returns the number of samples in the variable.
    * @return Index The number of samples in the variable.
@@ -1687,6 +1693,12 @@ struct VariableData {
    */
   IndexDomainView<R> dimensions() const { return data.domain; }
 
+  /**
+   * @brief Gets the rank of the VariableData
+   * @return std::size_t The rank of the VariableData
+   */
+  std::size_t rank() const { return data.data.rank(); }
+
   /**
    * @brief Returns the number of samples in the variable.
    * @return Index The number of samples in the variable.

mdio/variable_test.cc

@@ -361,6 +361,15 @@ TEST(Variable, open) {
   std::filesystem::remove_all("name");
 }
 
+TEST(Variable, rank) {
+  auto variable =
+      mdio::Variable<>::Open(json_good, mdio::constants::kCreateClean);
+  ASSERT_TRUE(variable.status().ok()) << variable.status();
+  auto rank = variable.value().rank();
+  EXPECT_EQ(rank, 2);
+  std::filesystem::remove_all("name");
+}
+
 TEST(Variable, openMetadata) {
   auto json = json_good["metadata"];
 
@@ -1050,6 +1059,19 @@ TEST(VariableData, testConstruction) {
   std::filesystem::remove_all("name");
 }
 
+TEST(VariableData, rank) {
+  auto variableFuture =
+      mdio::Variable<>::Open(json_good, mdio::constants::kCreateClean);
+  ASSERT_TRUE(variableFuture.status().ok()) << variableFuture.status();
+  auto variableObject = variableFuture.value();
+  auto variableDataFuture = variableObject.Read();
+  ASSERT_TRUE(variableDataFuture.status().ok()) << variableDataFuture.status();
+  auto variableDataObject = variableDataFuture.result();
+  EXPECT_EQ(variableDataObject.value().rank(), 2);
+
+  std::filesystem::remove_all("name");
+}
+
 TEST(VariableData, writeChunkedData) {
   auto result =
       mdio::Variable<>::Open(json_good, mdio::constants::kCreateClean).result();