Update to C++17 (#528)

Signed-off-by: Chris Lalancette <[email protected]>

Author: clalancette

test_security/CMakeLists.txt

@@ -2,9 +2,10 @@ cmake_minimum_required(VERSION 3.7)
 
 project(test_security)
 
-# Default to C++14
+# Default to C++17
 if(NOT CMAKE_CXX_STANDARD)
-  set(CMAKE_CXX_STANDARD 14)
+  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
 endif()
 if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   add_compile_options(-Wall -Wextra -Wpedantic)