From aa50cdac439121f9e40ff2638368dc913a0e2361 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 16 Sep 2016 13:21:10 -0400
Subject: [PATCH] Check for availability of unique_ptr and make_unique when
 building CMake

Some code paths may find these useful if available.
---
 Source/Checks/cm_cxx_features.cmake  | 5 +++++
 Source/Checks/cm_cxx_make_unique.cxx | 6 ++++++
 Source/Checks/cm_cxx_unique_ptr.cxx  | 6 ++++++
 Source/cmConfigure.cmake.h.in        | 2 ++
 4 files changed, 19 insertions(+)
 create mode 100644 Source/Checks/cm_cxx_make_unique.cxx
 create mode 100644 Source/Checks/cm_cxx_unique_ptr.cxx

diff --git a/Source/Checks/cm_cxx_features.cmake b/Source/Checks/cm_cxx_features.cmake
index 6fde7b67d..c6a532fcc 100644
--- a/Source/Checks/cm_cxx_features.cmake
+++ b/Source/Checks/cm_cxx_features.cmake
@@ -32,8 +32,13 @@ function(cm_check_cxx_feature name)
 endfunction()
 
 if(CMAKE_CXX_STANDARD)
+  cm_check_cxx_feature(make_unique)
+  if(CMake_HAVE_CXX_MAKE_UNIQUE)
+    set(CMake_HAVE_CXX_UNIQUE_PTR 1)
+  endif()
   cm_check_cxx_feature(nullptr)
   cm_check_cxx_feature(override)
+  cm_check_cxx_feature(unique_ptr)
   cm_check_cxx_feature(unordered_map)
   cm_check_cxx_feature(unordered_set)
 endif()
diff --git a/Source/Checks/cm_cxx_make_unique.cxx b/Source/Checks/cm_cxx_make_unique.cxx
new file mode 100644
index 000000000..a3ff68f9b
--- /dev/null
+++ b/Source/Checks/cm_cxx_make_unique.cxx
@@ -0,0 +1,6 @@
+#include <memory>
+int main()
+{
+  std::unique_ptr<int> u = std::make_unique<int>(0);
+  return *u;
+}
diff --git a/Source/Checks/cm_cxx_unique_ptr.cxx b/Source/Checks/cm_cxx_unique_ptr.cxx
new file mode 100644
index 000000000..a9d4ce5d1
--- /dev/null
+++ b/Source/Checks/cm_cxx_unique_ptr.cxx
@@ -0,0 +1,6 @@
+#include <memory>
+int main()
+{
+  std::unique_ptr<int> u(new int(0));
+  return *u;
+}
diff --git a/Source/cmConfigure.cmake.h.in b/Source/cmConfigure.cmake.h.in
index ccea22d68..8365367a0 100644
--- a/Source/cmConfigure.cmake.h.in
+++ b/Source/cmConfigure.cmake.h.in
@@ -30,8 +30,10 @@
 #cmakedefine CMAKE_USE_MACH_PARSER
 #cmakedefine CMAKE_USE_LIBUV
 #cmakedefine CMAKE_ENCODING_UTF8
+#cmakedefine CMake_HAVE_CXX_MAKE_UNIQUE
 #cmakedefine CMake_HAVE_CXX_NULLPTR
 #cmakedefine CMake_HAVE_CXX_OVERRIDE
+#cmakedefine CMake_HAVE_CXX_UNIQUE_PTR
 #cmakedefine CMake_HAVE_CXX_UNORDERED_MAP
 #cmakedefine CMake_HAVE_CXX_UNORDERED_SET
 #define CMAKE_BIN_DIR "/@CMAKE_BIN_DIR@"