Prior to this commit the default C++ code generator was `c++0x`.
A code generated with `c++0x` code-gen might have a vulnerability (undefined behavior) connected evolution of enums in a schema. This UB could break the backward compatibility if previously generated code casts an unknown enumerator to enum type that knows nothing about future enumerators added to the schema.
The main differences between `c++0x` and `c++11`:
- generated enums use explicitly declared underlying type;
- generated object-API tables don't declare default ctor() explicitly, instead of it default data member initializers are generated.
Please use `flatc --cpp-std c++0x` option for backward compatibility with old compilers.
* Add test for optional enums in Kotlin
* Rename optional_scalars2.fbs into optional_scalars.fbs
Also updated all references in the project to point to
"optional_scalars.fbs" instead of "optional_scalars2.fbs".
* Moved C++ to optional_scalars2 and added some tests.
Also deleted unused optional_scalars_generated.lobster
* Fixed whitespece in C++ gencode & fixed BUILD file
* Moved C++ onto optional_scalars2 in the .bat file
Co-authored-by: Casper Neo <cneo@google.com>
