diff --git a/libcxx/test/utilities/function.objects/arithmetic.operations/transparent.pass.cpp b/libcxx/test/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
new file mode 100644
index 000000000000..43e2e2120b27
--- /dev/null
+++ b/libcxx/test/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
@@ -0,0 +1,52 @@
+#include <functional>
+#include <string>
+
+template <class _Tp>
+struct is_transparent
+{
+private:
+    struct __two {char __lx; char __lxx;};
+    template <class _Up> static __two __test(...);
+    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+public:
+    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+};
+
+
+int main () {
+#if _LIBCPP_STD_VER > 11
+
+    static_assert ( !is_transparent<std::plus<int>>::value, "" );
+    static_assert ( !is_transparent<std::plus<std::string>>::value, "" );
+    static_assert (  is_transparent<std::plus<void>>::value, "" );
+    static_assert (  is_transparent<std::plus<>>::value, "" );
+
+    static_assert ( !is_transparent<std::minus<int>>::value, "" );
+    static_assert ( !is_transparent<std::minus<std::string>>::value, "" );
+    static_assert (  is_transparent<std::minus<void>>::value, "" );
+    static_assert (  is_transparent<std::minus<>>::value, "" );
+
+    static_assert ( !is_transparent<std::multiplies<int>>::value, "" );
+    static_assert ( !is_transparent<std::multiplies<std::string>>::value, "" );
+    static_assert (  is_transparent<std::multiplies<void>>::value, "" );
+    static_assert (  is_transparent<std::multiplies<>>::value, "" );
+
+    static_assert ( !is_transparent<std::divides<int>>::value, "" );
+    static_assert ( !is_transparent<std::divides<std::string>>::value, "" );
+    static_assert (  is_transparent<std::divides<void>>::value, "" );
+    static_assert (  is_transparent<std::divides<>>::value, "" );
+
+    static_assert ( !is_transparent<std::modulus<int>>::value, "" );
+    static_assert ( !is_transparent<std::modulus<std::string>>::value, "" );
+    static_assert (  is_transparent<std::modulus<void>>::value, "" );
+    static_assert (  is_transparent<std::modulus<>>::value, "" );
+
+    static_assert ( !is_transparent<std::negate<int>>::value, "" );
+    static_assert ( !is_transparent<std::negate<std::string>>::value, "" );
+    static_assert (  is_transparent<std::negate<void>>::value, "" );
+    static_assert (  is_transparent<std::negate<>>::value, "" );
+    
+#endif
+
+    return 0;
+    }
diff --git a/libcxx/test/utilities/function.objects/bitwise.operations/transparent.pass.cpp b/libcxx/test/utilities/function.objects/bitwise.operations/transparent.pass.cpp
new file mode 100644
index 000000000000..91d263ed03fc
--- /dev/null
+++ b/libcxx/test/utilities/function.objects/bitwise.operations/transparent.pass.cpp
@@ -0,0 +1,42 @@
+#include <functional>
+#include <string>
+
+template <class _Tp>
+struct is_transparent
+{
+private:
+    struct __two {char __lx; char __lxx;};
+    template <class _Up> static __two __test(...);
+    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+public:
+    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+};
+
+
+int main () {
+#if _LIBCPP_STD_VER > 11
+
+    static_assert ( !is_transparent<std::bit_and<int>>::value, "" );
+    static_assert ( !is_transparent<std::bit_and<std::string>>::value, "" );
+    static_assert (  is_transparent<std::bit_and<void>>::value, "" );
+    static_assert (  is_transparent<std::bit_and<>>::value, "" );
+
+    static_assert ( !is_transparent<std::bit_or<int>>::value, "" );
+    static_assert ( !is_transparent<std::bit_or<std::string>>::value, "" );
+    static_assert (  is_transparent<std::bit_or<void>>::value, "" );
+    static_assert (  is_transparent<std::bit_or<>>::value, "" );
+
+    static_assert ( !is_transparent<std::bit_xor<int>>::value, "" );
+    static_assert ( !is_transparent<std::bit_xor<std::string>>::value, "" );
+    static_assert (  is_transparent<std::bit_xor<void>>::value, "" );
+    static_assert (  is_transparent<std::bit_xor<>>::value, "" );
+
+    static_assert ( !is_transparent<std::bit_not<int>>::value, "" );
+    static_assert ( !is_transparent<std::bit_not<std::string>>::value, "" );
+    static_assert (  is_transparent<std::bit_not<void>>::value, "" );
+    static_assert (  is_transparent<std::bit_not<>>::value, "" );
+    
+#endif
+
+    return 0;
+    }
diff --git a/libcxx/test/utilities/function.objects/comparisons/transparent.pass.cpp b/libcxx/test/utilities/function.objects/comparisons/transparent.pass.cpp
new file mode 100644
index 000000000000..516b3644d712
--- /dev/null
+++ b/libcxx/test/utilities/function.objects/comparisons/transparent.pass.cpp
@@ -0,0 +1,52 @@
+#include <functional>
+#include <string>
+
+template <class _Tp>
+struct is_transparent
+{
+private:
+    struct __two {char __lx; char __lxx;};
+    template <class _Up> static __two __test(...);
+    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+public:
+    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+};
+
+
+int main () {
+#if _LIBCPP_STD_VER > 11
+
+    static_assert ( !is_transparent<std::less<int>>::value, "" );
+    static_assert ( !is_transparent<std::less<std::string>>::value, "" );
+    static_assert (  is_transparent<std::less<void>>::value, "" );
+    static_assert (  is_transparent<std::less<>>::value, "" );
+
+    static_assert ( !is_transparent<std::less_equal<int>>::value, "" );
+    static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" );
+    static_assert (  is_transparent<std::less_equal<void>>::value, "" );
+    static_assert (  is_transparent<std::less_equal<>>::value, "" );
+
+    static_assert ( !is_transparent<std::equal_to<int>>::value, "" );
+    static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" );
+    static_assert (  is_transparent<std::equal_to<void>>::value, "" );
+    static_assert (  is_transparent<std::equal_to<>>::value, "" );
+
+    static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" );
+    static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" );
+    static_assert (  is_transparent<std::not_equal_to<void>>::value, "" );
+    static_assert (  is_transparent<std::not_equal_to<>>::value, "" );
+
+    static_assert ( !is_transparent<std::greater<int>>::value, "" );
+    static_assert ( !is_transparent<std::greater<std::string>>::value, "" );
+    static_assert (  is_transparent<std::greater<void>>::value, "" );
+    static_assert (  is_transparent<std::greater<>>::value, "" );
+
+    static_assert ( !is_transparent<std::greater_equal<int>>::value, "" );
+    static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" );
+    static_assert (  is_transparent<std::greater_equal<void>>::value, "" );
+    static_assert (  is_transparent<std::greater_equal<>>::value, "" );
+
+#endif
+
+    return 0;
+    }
diff --git a/libcxx/test/utilities/function.objects/logical.operations/transparent.pass.cpp b/libcxx/test/utilities/function.objects/logical.operations/transparent.pass.cpp
new file mode 100644
index 000000000000..5b3e1877c218
--- /dev/null
+++ b/libcxx/test/utilities/function.objects/logical.operations/transparent.pass.cpp
@@ -0,0 +1,37 @@
+#include <functional>
+#include <string>
+
+template <class _Tp>
+struct is_transparent
+{
+private:
+    struct __two {char __lx; char __lxx;};
+    template <class _Up> static __two __test(...);
+    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+public:
+    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+};
+
+
+int main () {
+#if _LIBCPP_STD_VER > 11
+
+    static_assert ( !is_transparent<std::logical_and<int>>::value, "" );
+    static_assert ( !is_transparent<std::logical_and<std::string>>::value, "" );
+    static_assert (  is_transparent<std::logical_and<void>>::value, "" );
+    static_assert (  is_transparent<std::logical_and<>>::value, "" );
+
+    static_assert ( !is_transparent<std::logical_or<int>>::value, "" );
+    static_assert ( !is_transparent<std::logical_or<std::string>>::value, "" );
+    static_assert (  is_transparent<std::logical_or<void>>::value, "" );
+    static_assert (  is_transparent<std::logical_or<>>::value, "" );
+
+    static_assert ( !is_transparent<std::logical_not<int>>::value, "" );
+    static_assert ( !is_transparent<std::logical_not<std::string>>::value, "" );
+    static_assert (  is_transparent<std::logical_not<void>>::value, "" );
+    static_assert (  is_transparent<std::logical_not<>>::value, "" );
+    
+#endif
+
+    return 0;
+    }