Is there any boost-independent version of boost/tr1 shared_ptr

Question

I'm looking for independent implementation of boost/tr1 shared_ptr, weak_ptr and enable_shared_from_this.

I need:

• Boost independent very small implementation of these features.
• I need support of only modern compilers like GCC-4.x, MSVC-2008, Intel not things like MSVC6 or gcc-3.3
• I need it to be licensed under non-copyleft LGPL compatible license like Boost/Mit/3-clause BSD.

So I can include it in my library.

Note - it is quite hard to extract shared_ptr from boost, at least BCP gives about 324 files...

Answer 1

Recent versions of GCC include an implementation of TR1.

#include <tr1/memory>

This gives you all three things you mention, in the std::tr1 namespace.

Answer 2

I extracted shared_ptr from Boost to use it separately, and it was definitely fewer than 300 files. That was 3 years ago however so things may have changed (maybe there are more files in the config folder these days?). What I needed for the shared_ptr was:

• assert.hpp
• checked_delete.hpp
• throw_exception.hpp
• config.hpp and config directory
• detail/bad_weak_ptr.hpp
• detail/interlocked.hpp
• detail/shared_count.hpp
• detail/sp_counted_base.hpp
• detail/sp_counted_base_w32.hpp
• detail/sp_counted_impl.hpp
• detail/workaround.hpp
• and finally, shared_ptr.hpp itself.

I don't think weak_ptr and enable_shared_from_this will add a lot of files to that.

Answer 3

BCP work at the component level, so any dependency between components result in an explosion of the number of files.

I would try to include the files that I need an those that the compiler tell me that are not found, one by one. When your product is build you should have the needed files.

This should reduce a lot the number of files, at the expenses of some of your time.

It would be clearly a must if BCP was able to do this for you: worked at the file level and not at the component level, and was able to take care of conditional compilation.