Implement std::enable_if in HB

Change-Id: I72f415403ef0d88defc80f81cb1038013f94b99f
RTC:152209
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/24091
Tested-by: Jenkins Server
Reviewed-by: Martin Gloff <mgloff@us.ibm.com>
Tested-by: FSP CI Jenkins
Reviewed-by: A. P. Williams III <iawillia@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/usr/testcore/lib/enable_if.H b/src/usr/testcore/lib/enable_if.H
new file mode 100644
index 000000000..feb209e3e
--- /dev/null
+++ b/src/usr/testcore/lib/enable_if.H
@@ -0,0 +1,83 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/testcore/lib/enable_if.H $                            */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2016                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+#ifndef __LIB_ENABLE_IF_H
+#define __LIB_ENABLE_IF_H
+
+#include <cxxtest/TestSuite.H>
+#include <type_traits>
+
+// STLEnableIfTest1 overloads are enabled via the return type
+template<class T>
+typename std::enable_if<std::is_integral<T>::value, T>::type
+    STLEnableIfTest1(T t)
+{
+    t += 2;
+    return t;
+}
+
+template<class T>
+typename std::enable_if<!std::is_integral<T>::value, T>::type
+    STLEnableIfTest1(T t)
+{
+    // if floating point
+    if ( std::is_same<float, typename std::remove_cv<T>::type>::value  ||
+         std::is_same<double, typename std::remove_cv<T>::type>::value  ||
+         std::is_same<long double, typename std::remove_cv<T>::type>::value )
+    {
+        t += 1.1;
+    }
+    return t;
+}
+
+
+class STLEnableIfTest : public CxxTest::TestSuite
+{
+    public:
+        void testEnableIf()
+        {
+            using namespace std;
+
+            int i = 1;
+            if (STLEnableIfTest1(i) != 3)
+            {
+                TS_FAIL("enable_if: expected integral function call to return 3 but see %d",
+                    STLEnableIfTest1(i));
+            }
+            else
+            {
+                TS_TRACE("enable_if: expected integral function called");
+            }
+
+            float f = 1.1;
+            if (STLEnableIfTest1(f) != 2.2)
+            {
+                TS_FAIL("enable_if: expected non-integral function call to return 2.2 but see %f",
+                    STLEnableIfTest1(f));
+            }
+        }
+
+};
+
+#endif