add immer table cerealize as vector style

lager/extra/cereal/immer_table.hpp

@@ -0,0 +1,71 @@
+//
+// lager - library for functional interactive c++ programs
+// Copyright (C) 2017 Juan Pedro Bolivar Puente
+//
+// This file is part of lager.
+//
+// lager is free software: you can redistribute it and/or modify
+// it under the terms of the MIT License, as detailed in the LICENSE
+// file located at the root of this source code distribution,
+// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
+//
+
+#pragma once
+
+#include <lager/config.hpp>
+
+#include <cereal/cereal.hpp>
+
+#include <immer/table.hpp>
+#include <immer/table_transient.hpp>
+#include <type_traits>
+
+namespace cereal {
+// This code has mostly been adapted from <cereal/types/vector.hpp>
+// We don't deal for now with data that could be potentially serialized
+// directly in binary format.
+
+template <typename Archive,
+          typename T,
+          typename K,
+          typename H,
+          typename E,
+          typename MP,
+          std::uint32_t B>
+void CEREAL_SAVE_FUNCTION_NAME(Archive& ar,
+                               const immer::table<T, K, H, E, MP, B>& table)
+{
+    ar(make_size_tag(static_cast<size_type>(table.size())));
+    for (auto&& v : table)
+        ar(v);
+}
+
+template <typename Archive,
+          typename T,
+          typename K,
+          typename H,
+          typename E,
+          typename MP,
+          std::uint32_t B>
+void CEREAL_LOAD_FUNCTION_NAME(Archive& ar,
+                               immer::table<T, K, H, E, MP, B>& table)
+{
+    size_type size{};
+    ar(make_size_tag(size));
+
+    if (!size)
+        return;
+
+    auto t = immer::table<T, K, H, E, MP, B>{}.transient();
+
+    for (auto i = size_type{}; i < size; ++i) {
+        T x;
+        ar(x);
+        t.insert(std::move(x));
+    }
+    table = std::move(t).persistent();
+
+    assert(size == table.size());
+}
+
+} // namespace cereal

test/cereal/immer_table.cpp

@@ -0,0 +1,29 @@
+//
+// lager - library for functional interactive c++ programs
+// Copyright (C) 2017 Juan Pedro Bolivar Puente
+//
+// This file is part of lager.
+//
+// lager is free software: you can redistribute it and/or modify
+// it under the terms of the MIT License, as detailed in the LICENSE
+// file located at the root of this source code distribution,
+// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
+//
+
+#include "cerealize.hpp"
+#include <catch2/catch.hpp>
+#include <lager/extra/cereal/immer_table.hpp>
+
+struct entry_t
+{
+    size_t id;
+    size_t value;
+};
+
+TEST_CASE("basic")
+{
+    auto x = immer::table<entry_t>{{.id = 1, .value = 2}, //
+                                   {.id = 3, .value = 4}};
+    auto y = cerealize(x);
+    CHECK(x == y);
+}