#273: add std::optional serializer

src/checkpoint/checkpoint.h

@@ -65,6 +65,7 @@
 #include "checkpoint/container/unique_ptr_serialize.h"
 #include "checkpoint/container/view_serialize.h"
 #include "checkpoint/container/variant_serialize.h"
+#include "checkpoint/container/optional_serialize.h"
 
 #include "checkpoint/container/kokkos_unordered_map_serialize.h"
 #include "checkpoint/container/kokkos_pair_serialize.h"

src/checkpoint/container/optional_serialize.h

@@ -0,0 +1,95 @@
+/*
+//@HEADER
+// *****************************************************************************
+//
+//                             optional_serialize.h
+//                 DARMA/checkpoint => Serialization Library
+//
+// Copyright 2019 National Technology & Engineering Solutions of Sandia, LLC
+// (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the U.S.
+// Government retains certain rights in this software.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from this
+//   software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Questions? Contact [email protected]
+//
+// *****************************************************************************
+//@HEADER
+*/
+
+#if !defined INCLUDED_CHECKPOINT_CONTAINER_OPTIONAL_SERIALIZE_H
+#define INCLUDED_CHECKPOINT_CONTAINER_OPTIONAL_SERIALIZE_H
+
+#include "checkpoint/common.h"
+
+#include <optional>
+
+namespace checkpoint {
+
+template <typename SerializerT, typename T>
+void deserializeOptional(SerializerT& s, std::optional<T>& optional) {
+  using BoolReconstructor =
+    dispatch::Reconstructor<typename dispatch::CleanType<bool>::CleanT>;
+  using ValReconstructor =
+    dispatch::Reconstructor<typename dispatch::CleanType<T>::CleanT>;
+
+  dispatch::Allocator<bool> boolAllocated;
+  dispatch::Allocator<T> valAllocated;
+
+  auto* has_value = BoolReconstructor::construct(boolAllocated.buf);
+  s | *has_value;
+  if (*has_value) {
+    auto* value = ValReconstructor::construct(valAllocated.buf);
+    s | *value;
+    optional = *value;
+  } else {
+    optional.reset();
+  }
+}
+
+template <typename SerializerT, typename T>
+void serialize(SerializerT& s, std::optional<T>& optional) {
+  if (s.isFootprinting()) {
+    s.countBytes(optional);
+    if (optional.has_value()) {
+      s.addBytes(sizeof(*optional));
+    }
+  } else if (s.isUnpacking()) {
+    deserializeOptional(s, optional);
+  } else {
+    bool has_value = optional.has_value();
+
+    s | has_value;
+    if (has_value) {
+      s | *optional;
+    }
+  }
+}
+
+} /* end namespace checkpoint */
+
+#endif /*INCLUDED_CHECKPOINT_CONTAINER_OPTIONAL_SERIALIZE_H*/

tests/unit/test_footprinter.cc

@@ -533,6 +533,27 @@ TEST_F(TestFootprinter, test_vector) {
   }
 }
 
+TEST_F(TestFootprinter, test_optional_footprint) {
+  {
+    std::optional<bool> opt = true;
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt) + sizeof(bool));
+    opt.reset();
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt));
+  }
+  {
+    std::optional<long long> opt = 123;
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt) + sizeof(long long));
+    opt.reset();
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt));
+  }
+  {
+    std::optional<std::string> opt = "999";
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt) + sizeof(std::string("999")));
+    opt.reset();
+    EXPECT_EQ(checkpoint::getMemoryFootprint(opt), sizeof(opt));
+  }
+}
+
 TEST_F(TestFootprinter, test_virtual_serialize) {
   {
     std::unique_ptr<TestBase> ptr = std::make_unique<TestDerived2>(0);

tests/unit/test_optional.cc

@@ -0,0 +1,93 @@
+/*
+//@HEADER
+// *****************************************************************************
+//
+//                               test_optional.cc
+//                 DARMA/checkpoint => Serialization Library
+//
+// Copyright 2019 National Technology & Engineering Solutions of Sandia, LLC
+// (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the U.S.
+// Government retains certain rights in this software.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from this
+//   software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Questions? Contact [email protected]
+//
+// *****************************************************************************
+//@HEADER
+*/
+
+#include <gtest/gtest.h>
+
+#include "test_harness.h"
+
+#include <checkpoint/checkpoint.h>
+
+#include <optional>
+#include <string>
+
+namespace checkpoint { namespace tests { namespace unit {
+
+using TestOptional = TestHarness;
+
+template <typename T>
+void testOptional(std::optional<T> before) {
+    // Test serialization when containing the value
+    {
+        auto ret = checkpoint::serialize(before);
+        auto after = checkpoint::deserialize<std::optional<T>>(ret->getBuffer());
+
+        EXPECT_TRUE(nullptr != after);
+        EXPECT_EQ(before.has_value(), after->has_value());
+        EXPECT_EQ(before, *after);
+    }
+
+    before.reset();
+
+    // Test serialization when there is not value
+    {
+        auto ret = checkpoint::serialize(before);
+        auto after = checkpoint::deserialize<std::optional<T>>(ret->getBuffer());
+
+        EXPECT_TRUE(nullptr != after);
+        EXPECT_EQ(before.has_value(), after->has_value());
+        EXPECT_EQ(before, *after);
+    }
+}
+
+TEST_F(TestOptional, test_optional) {
+    testOptional<bool>({true});
+    testOptional<uint8_t>({1});
+    testOptional<uint16_t>({2});
+    testOptional<int>({3});
+    testOptional<long long>({4});
+    testOptional<float>({5});
+    testOptional<double>({6});
+    testOptional<std::string>({"7"});
+}
+
+}}} // end namespace checkpoint::tests::unit