Update sample makefiles to C++14, as that's what PyTorch requires now

Signed-off-by: Edward Z. Yang <[email protected]>

Author: ezyang

advanced_source/cpp_export.rst

@@ -205,7 +205,7 @@ minimal ``CMakeLists.txt`` to build it could look as simple as:
 
   add_executable(example-app example-app.cpp)
   target_link_libraries(example-app "${TORCH_LIBRARIES}")
-  set_property(TARGET example-app PROPERTY CXX_STANDARD 11)
+  set_property(TARGET example-app PROPERTY CXX_STANDARD 14)
 
 The last thing we need to build the example application is the LibTorch
 distribution. You can always grab the latest stable release from the `download

advanced_source/cpp_frontend.rst

@@ -144,7 +144,7 @@ on we'll use this ``CMakeLists.txt`` file:
 
   add_executable(dcgan dcgan.cpp)
   target_link_libraries(dcgan "${TORCH_LIBRARIES}")
-  set_property(TARGET dcgan PROPERTY CXX_STANDARD 11)
+  set_property(TARGET dcgan PROPERTY CXX_STANDARD 14)
 
 .. note::