ChaiScript 6 always used a shared_ptr to wrap C++ objects created in
ChaiScript. Newer versions avoid this by only wrapping objects that cannot
be copied. This has the side effect that ChaiScript depends on correctly
implemented C++ copy and move constructors in unexpected locations.
I don't think the reduced overhead (by avoiding the shared_ptr) justifies
the new behavior in every case.
Therefore, I suggest we temporarily only perform this optimization if the class
is trivially destructible, until unexpected copies and moves in ChaiScript
are fixed (if this is even possible), or there is a sanitizer/compiler warning
that can detect these cases.
Before the change the following code will call the ctor once, move once,
and the dtor twice:
auto obj = MoveableObject();
After this change it will only call the ctor once and the dtor once.
I initially tried to use the existing .clang-format file,
but it does not match the code style (at least with clang-format 11)
and the formatting is not consistent across files.
Therefore, I decided to rewrite the .clang-format with some personal
preferences.
Used command
find . -iname "*.hpp" -o -iname "*.cpp" | xargs clang-format -i -style=file
Needed 1-2 cleanups by hand. 99% was automatic.
* The version that ships with ubuntu 14.04 seems to not work.
I had to build from scratch
* Use cmake to generate the build commands that clang-modernize wants
```sh
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS:bool=true ../ChaiScript/
```
* Use the clang-modernize tool. Note that you have to be pretty explicit
about the include paths if you want it to also update your include
files
```sh
../llvm-build/bin/clang-modernize ../ChaiScript/src/*.cpp -for-compilers=gcc-4.8 -include /home/jason/ChaiScript/include,/hjason/ChaiScript/include/chaiscript,/home/jason/ChaiScript/include/chaiscript/dispatchkit,/home/jason/ChaiScript/include/chaiscript/language -p compile_commands.json
```
* In my case, it left some unused `typedef`s behind, which I cleaned up.
