5 files changed, 234 insertions, 0 deletions
diff --git a/third_party/immer/test/box/default.cpp b/third_party/immer/test/box/default.cpp
new file mode 100644
index 000000000000..fbd1b178df08
--- /dev/null
+++ b/third_party/immer/test/box/default.cpp
@@ -0,0 +1,12 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/box.hpp>
+
+#define BOX_T ::immer::box
+#include "generic.ipp"
diff --git a/third_party/immer/test/box/gc.cpp b/third_party/immer/test/box/gc.cpp
new file mode 100644
index 000000000000..04e459559abc
--- /dev/null
+++ b/third_party/immer/test/box/gc.cpp
@@ -0,0 +1,20 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/box.hpp>
+#include <immer/heap/gc_heap.hpp>
+#include <immer/refcount/no_refcount_policy.hpp>
+
+using gc_memory = immer::memory_policy<immer::heap_policy<immer::gc_heap>,
+                                       immer::no_refcount_policy>;
+
+template <typename T>
+using test_box_t = immer::box<T, gc_memory>;
+
+#define BOX_T test_box_t
+#include "generic.ipp"
diff --git a/third_party/immer/test/box/generic.ipp b/third_party/immer/test/box/generic.ipp
new file mode 100644
index 000000000000..cfb5f04ea1b9
--- /dev/null
+++ b/third_party/immer/test/box/generic.ipp
@@ -0,0 +1,58 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#ifndef BOX_T
+#error "define the box template to use in BOX_T"
+#endif
+
+#include <catch.hpp>
+
+TEST_CASE("construction and copy")
+{
+    auto x = BOX_T<int>{};
+    CHECK(x == 0);
+
+    auto y = x;
+    CHECK(&x.get() == &y.get());
+
+    auto z = std::move(x);
+    CHECK(&z.get() == &y.get());
+}
+
+TEST_CASE("equality")
+{
+    auto x = BOX_T<int>{};
+    auto y = x;
+    CHECK(x == 0.0f);
+    CHECK(x == y);
+    CHECK(x == BOX_T<int>{});
+    CHECK(x != BOX_T<int>{42});
+}
+
+TEST_CASE("update")
+{
+    auto x = BOX_T<int>{};
+    auto y = x.update([](auto v) { return v + 1; });
+    CHECK(x == 0);
+    CHECK(y == 1);
+}
+
+TEST_CASE("update move")
+{
+    auto x    = BOX_T<int>{};
+    auto addr = &x.get();
+    auto y    = std::move(x).update(
+        [](auto&& v) { return std::forward<decltype(v)>(v) + 1; });
+
+    CHECK(y == 1);
+    if (std::is_empty<typename BOX_T<int>::memory_policy::refcount>::value) {
+        CHECK(&y.get() != addr);
+    } else {
+        CHECK(&y.get() == addr);
+    }
+}
diff --git a/third_party/immer/test/box/recursive.cpp b/third_party/immer/test/box/recursive.cpp
new file mode 100644
index 000000000000..4c8fce07dea2
--- /dev/null
+++ b/third_party/immer/test/box/recursive.cpp
@@ -0,0 +1,108 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/algorithm.hpp>
+#include <immer/box.hpp>
+#include <immer/flex_vector.hpp>
+#include <immer/map.hpp>
+#include <immer/set.hpp>
+#include <immer/vector.hpp>
+
+#include <catch.hpp>
+
+struct rec_vec
+{
+    int data;
+    immer::vector<immer::box<rec_vec>> children;
+};
+
+TEST_CASE("recursive vector")
+{
+    auto v1 = rec_vec{42,
+                      {rec_vec{12, {}},
+                       rec_vec{13, {rec_vec{5, {}}, rec_vec{7, {}}}},
+                       rec_vec{15, {}}}};
+    CHECK(v1.data == 42);
+    CHECK(v1.children[0]->data == 12);
+    CHECK(v1.children[1]->children[0]->data == 5);
+}
+
+struct rec_fvec
+{
+    int data;
+    immer::flex_vector<immer::box<rec_fvec>> children;
+};
+
+TEST_CASE("recursive flex_vector")
+{
+    auto v1 = rec_fvec{42,
+                       {rec_fvec{12, {}},
+                        rec_fvec{13, {rec_fvec{5, {}}, rec_fvec{7, {}}}},
+                        rec_fvec{15, {}}}};
+    CHECK(v1.data == 42);
+    CHECK(v1.children[0]->data == 12);
+    CHECK(v1.children[1]->children[0]->data == 5);
+}
+
+struct rec_map
+{
+    int data;
+    immer::map<std::string, immer::box<rec_map>> children;
+};
+
+TEST_CASE("recursive map")
+{
+    auto v1 = rec_map{42, {}};
+    auto v2 = rec_map{43, v1.children.set("hello", rec_map{12, {}})};
+    auto v3 = rec_map{44, v2.children.set("world", rec_map{13, {}})};
+
+    CHECK(v3.data == 44);
+    CHECK(v3.children["hello"]->data == 12);
+    CHECK(v3.children["world"]->data == 13);
+}
+
+struct rec_set
+{
+    int data;
+    immer::set<immer::box<rec_set>> children;
+
+    bool operator==(const rec_set& other) const
+    {
+        return data == other.data && children == other.children;
+    }
+    bool operator!=(const rec_set& other) const { return !(*this == other); }
+};
+
+namespace std {
+
+template <>
+struct hash<rec_set>
+{
+    auto operator()(const rec_set& s)
+    {
+        return std::hash<decltype(s.data)>{}(s.data) ^
+               immer::accumulate(
+                   s.children, std::size_t{}, [](auto ac, auto v) {
+                       return std::hash<decltype(v)>{}(v);
+                   });
+    }
+};
+
+} // namespace std
+
+TEST_CASE("recursive set")
+{
+    auto v1 = rec_set{42, {}};
+    auto v2 = rec_set{43, v1.children.insert(rec_set{12, {}})};
+    auto v3 = rec_set{44, v2.children.insert(rec_set{13, {}})};
+
+    CHECK(v3.data == 44);
+    CHECK(v3.children.count(rec_set{12, {}}) == 1);
+    CHECK(v3.children.count(rec_set{13, {}}) == 1);
+    CHECK(v3.children.count(rec_set{14, {}}) == 0);
+}
diff --git a/third_party/immer/test/box/vector-of-boxes-transient.cpp b/third_party/immer/test/box/vector-of-boxes-transient.cpp
new file mode 100644
index 000000000000..623c8ba37d32
--- /dev/null
+++ b/third_party/immer/test/box/vector-of-boxes-transient.cpp
@@ -0,0 +1,36 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/box.hpp>
+#include <immer/vector.hpp>
+#include <immer/vector_transient.hpp>
+
+#include <catch.hpp>
+
+TEST_CASE("issue-33")
+{
+    using Element = immer::box<std::string>;
+    auto vect     = immer::vector<Element>{};
+
+    // this one works fine
+    for (auto i = 0; i < 100; ++i) {
+        vect = vect.push_back(Element("x"));
+    }
+
+    // this one doesn't compile
+    auto t = vect.transient();
+
+    for (auto i = 0; i < 100; ++i) {
+        t.push_back(Element("x"));
+    }
+
+    vect = t.persistent();
+
+    CHECK(*vect[0] == "x");
+    CHECK(*vect[99] == "x");
+}