1 files changed, 46 insertions, 0 deletions
diff --git a/src/boost/libs/callable_traits/test/args_constraints.cpp b/src/boost/libs/callable_traits/test/args_constraints.cpp
new file mode 100644
index 00000000..ef651cdb
--- /dev/null
+++ b/src/boost/libs/callable_traits/test/args_constraints.cpp
@@ -0,0 +1,46 @@
+
+/*
+Copyright Barrett Adair 2016-2017
+
+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/callable_traits/args.hpp>
+#include "test.hpp"
+
+struct foo;
+
+template<typename T>
+struct is_substitution_failure_args {
+
+    template<typename>
+    static auto test(...) -> std::true_type;
+
+    template<typename U,
+        TRAIT(boost::callable_traits::args, U, std::tuple)* = nullptr>
+    static auto test(int) -> std::false_type;
+
+    static constexpr bool value = decltype(test<T>(0))::value;
+};
+
+int main() {
+
+    CT_ASSERT(is_substitution_failure_args<int>::value);
+    CT_ASSERT(is_substitution_failure_args<int &>::value);
+    CT_ASSERT(is_substitution_failure_args<int (** const &)()>::value);
+    CT_ASSERT(is_substitution_failure_args<int (foo::** &)()>::value);
+    CT_ASSERT(is_substitution_failure_args<int (foo::** const)()>::value);
+    CT_ASSERT(is_substitution_failure_args<int (foo::** const &)()>::value);
+    CT_ASSERT(is_substitution_failure_args<int (foo::** volatile)()>::value);
+    CT_ASSERT(!is_substitution_failure_args<int (* const &)()>::value);
+    CT_ASSERT(!is_substitution_failure_args<int (foo::* &)()>::value);
+    CT_ASSERT(!is_substitution_failure_args<int (foo::* const)()>::value);
+    CT_ASSERT(!is_substitution_failure_args<int (foo::* const &)()>::value);
+    CT_ASSERT(!is_substitution_failure_args<int (foo::* volatile)()>::value);
+    auto lambda = [](){};
+    CT_ASSERT(!is_substitution_failure_args<decltype(lambda)&>::value);
+    CT_ASSERT(is_substitution_failure_args<void>::value);
+}
+