Use std::unordered_map instead of hash_map where available.

2 files changed, 31 insertions, 0 deletions

diff --git a/Source/Checks/cm_cxx11_unordered_map.cmake b/Source/Checks/cm_cxx11_unordered_map.cmake
new file mode 100644
index 0000000..80fe391
--- /dev/null
+++ b/Source/Checks/cm_cxx11_unordered_map.cmake
@@ -0,0 +1,25 @@
+
+if(CMAKE_CXX_STANDARD AND NOT DEFINED CMake_HAVE_CXX11_UNORDERED_MAP)
+  message(STATUS "Checking if compiler supports C++11 unordered_map")
+  try_compile(CMake_HAVE_CXX11_UNORDERED_MAP
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${CMAKE_CURRENT_LIST_DIR}/cm_cxx11_unordered_map.cpp
+    CMAKE_FLAGS -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
+    OUTPUT_VARIABLE OUTPUT
+    )
+  if(CMake_HAVE_CXX11_UNORDERED_MAP)
+    message(STATUS "Checking if compiler supports C++11 unordered_map - yes")
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+      "Determining if compiler supports C++11 unordered_map passed with the following output:\n"
+      "${OUTPUT}\n"
+      "\n"
+      )
+  else()
+    message(STATUS "Checking if compiler supports C++11 unordered_map - no")
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+      "Determining if compiler supports C++11 unordered_map failed with the following output:\n"
+      "${OUTPUT}\n"
+      "\n"
+      )
+  endif()
+endif()
diff --git a/Source/Checks/cm_cxx11_unordered_map.cpp b/Source/Checks/cm_cxx11_unordered_map.cpp
new file mode 100644
index 0000000..beeb31b
--- /dev/null
+++ b/Source/Checks/cm_cxx11_unordered_map.cpp
@@ -0,0 +1,6 @@
+#include <unordered_map>
+int main() {
+  std::unordered_map<int, int> map;
+  map[0] = 0;
+  return 0;
+}