1 files changed, 71 insertions, 0 deletions
diff --git a/libcxx/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp b/libcxx/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp
new file mode 100644
index 00000000000..10bf7f8576f
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <complex>
+
+// template<class T>
+//   complex<T>
+//   proj(const complex<T>& x);
+
+#include <complex>
+#include <cassert>
+
+#include "../cases.h"
+
+template <class T>
+void
+test(const std::complex<T>& z, std::complex<T> x)
+{
+    assert(proj(z) == x);
+}
+
+template <class T>
+void
+test()
+{
+    test(std::complex<T>(1, 2), std::complex<T>(1, 2));
+    test(std::complex<T>(-1, 2), std::complex<T>(-1, 2));
+    test(std::complex<T>(1, -2), std::complex<T>(1, -2));
+    test(std::complex<T>(-1, -2), std::complex<T>(-1, -2));
+}
+
+void test_edges()
+{
+    const unsigned N = sizeof(x) / sizeof(x[0]);
+    for (unsigned i = 0; i < N; ++i)
+    {
+        std::complex<double> r = proj(x[i]);
+        switch (classify(x[i]))
+        {
+        case zero:
+        case non_zero:
+            assert(r == x[i]);
+            assert(std::signbit(real(r)) == std::signbit(real(x[i])));
+            assert(std::signbit(imag(r)) == std::signbit(imag(x[i])));
+            break;
+        case inf:
+            assert(std::isinf(real(r)) && real(r) > 0);
+            assert(imag(r) == 0);
+            assert(std::signbit(imag(r)) == std::signbit(imag(x[i])));
+            break;
+        case NaN:
+        case non_zero_nan:
+            assert(classify(r) == classify(x[i]));
+            break;
+        }
+    }
+}
+
+int main()
+{
+    test<float>();
+    test<double>();
+    test<long double>();
+    test_edges();
+}