Add c++14 requirement for rigid_body_solver

Author: davidscn

quickstart/solid-cpp/CMakeLists.txt

@@ -2,6 +2,11 @@ CMAKE_MINIMUM_REQUIRED(VERSION 3.10.2)
 SET(TARGET "rigid_body_solver")
 PROJECT(${TARGET} LANGUAGES CXX DESCRIPTION "rigid_body_solver")
 
+# The rigid body solver requires c++14
+SET(CMAKE_CXX_STANDARD 14)
+SET(CMAKE_CXX_EXTENSIONS OFF)
+SET(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 FIND_PACKAGE(precice REQUIRED CONFIG)
 ADD_EXECUTABLE(
         ${TARGET}