Is there a GCC pragma to switch C++11 on and off?

Question

I have some headers that fight with C++11 but I'd like to use features like initializer lists in my code. My research says that you can enable newer features at the command-line only, like:

g++ -std=c++11

What I'd really like is to put in my code:

#pragma CXX11_OFF
#include <old.hpp>
#pragma CXX11_ON

vector<int> v {1,2,3};

I haven't been able to find such a pragma. Does it exist?

Answer 1

#pragma GCC diagnostic warning "-std=c++11"

This line adds a cpp 11 flag to compiler.

Answer 2

No. Such a pragma does not exist.

You can find a list of all pragmas GCC supports in § 6.61 of the manual.

Answer 3

I don't know if there exists such a pragma. But turning C++11 on and off during the same compilation unit looks akward to me. Perhaps you should place the "old" part inside a dll and import it then in the "new" part. Then you can only compile the new part with c++11 enabled