1 files changed, 106 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/core/to.cpp b/src/boost/libs/hana/test/core/to.cpp
new file mode 100644
index 000000000..f4dd54ef7
--- /dev/null
+++ b/src/boost/libs/hana/test/core/to.cpp
@@ -0,0 +1,106 @@
+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#include <boost/hana/core/to.hpp>
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/core/tag_of.hpp>
+
+#include <string>
+#include <type_traits>
+namespace hana = boost::hana;
+
+
+template <typename X, typename Y>
+constexpr auto operator==(X x, Y y)
+{ return x.value == y.value; }
+
+struct Datatype {
+    int value;
+    using hana_tag = Datatype;
+};
+
+struct Other {
+    int value;
+    using hana_tag = Datatype;
+};
+
+struct SpecializedFrom;
+struct specialized_from {
+    int value;
+    using hana_tag = SpecializedFrom;
+};
+
+struct SpecializedTo;
+struct specialized_to {
+    int value;
+    using hana_tag = SpecializedTo;
+};
+
+namespace boost { namespace hana {
+    template <>
+    struct to_impl<SpecializedTo, SpecializedFrom> {
+        template <typename T>
+        static constexpr auto apply(T t)
+        { return specialized_to{t.value}; }
+    };
+}}
+
+template <typename F, typename T>
+void check_convert(F f, T t) {
+    using From = hana::tag_of_t<F>;
+    using To = hana::tag_of_t<T>;
+
+    // Check From -> To conversion
+    BOOST_HANA_RUNTIME_CHECK(hana::to<To>(f) == t);
+    static_assert(std::is_same<
+        hana::tag_of_t<decltype(hana::to<To>(f))>, To
+    >{}, "");
+
+    static_assert(hana::is_convertible<From, To>{}, "");
+
+
+    // Make sure From -> From and To -> To are the identity.
+    BOOST_HANA_RUNTIME_CHECK(hana::to<From>(f) == f);
+    static_assert(std::is_same<
+        hana::tag_of_t<decltype(hana::to<From>(f))>, From
+    >{}, "");
+
+    BOOST_HANA_RUNTIME_CHECK(hana::to<To>(t) == t);
+    static_assert(std::is_same<
+        hana::tag_of_t<decltype(hana::to<To>(t))>, To
+    >{}, "");
+
+    static_assert(hana::is_convertible<From, From>{}, "");
+    static_assert(hana::is_convertible<To, To>{}, "");
+
+    static_assert(hana::is_embedded<From, From>{}, "");
+    static_assert(hana::is_embedded<To, To>{}, "");
+}
+
+template <typename X>
+void check_variable_template_in_dependent_context(X x) {
+    hana::to<int>(x);
+}
+
+int main() {
+    // Clang used to assert in the code generation when we used variable
+    // templates inside a lambda; this is to catch this.
+    check_variable_template_in_dependent_context(3);
+
+    check_convert("abcdef", std::string{"abcdef"});
+    check_convert(int{1}, double{1});
+    check_convert(double{1}, int{1});
+    check_convert(std::true_type{}, int{1});
+    check_convert(std::false_type{}, int{0});
+    check_convert(Datatype{1}, Datatype{1});
+    check_convert(Other{1}, Other{1});
+    check_convert(specialized_from{1}, specialized_to{1});
+
+    static_assert(!hana::is_convertible<void, int>{}, "");
+    static_assert(!hana::is_embedded<void, int>{}, "");
+
+    static_assert(hana::is_convertible<int, void>{}, "");
+    static_assert(!hana::is_embedded<int, void>{}, "");
+}