So I have a polyglot header file that is included/imported from Python and C++. The part I'm insterested in looks like so:
#pragma once
#if 0
"""
#endif
constexpr int
#if 0
"""
#endif
val = 2;
The idea is that Python code that imports it will see:
"""
constexpr int
"""
val = 2;
while C++ code that inculdes it will see
constexpr int
val = 2;
What I find strange I that I get the following warning (only when compiling in Linux):
warning: missing terminating " character
And this can be shown in simple c++ Demo (where the header is not included but defined inline)
The thing is that the """ sequence is mentioned inside an #if 0 / #endif block. Why am I getting warnings for something that should be preprocessed out, and is there a way to avoid them?
Discussion about whether this is a logical thing to do for OP aside:
For the purpose of a polyglot, this works without warnings:
#if 0
""""
#endif
constexpr int
#if 0
" """
#endif
val = 2;
The C++ compiler is now happy about matched quotes and for the python interpreter, the docstring now starts with a " and ends in " . The last space in the docstring is needed for python to recognize the triple quotes at the end.