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Subject: [boost] Progress on the tweener library (was: Interest in a tweener library)
From: Julien Jorge (julien.jorge_at_[hidden])
Date: 2012-07-23 02:18:55


I have created a git repository to receive the Boost.Tweener library.
It is currently located at

I have started the templatization of the classes. Most easing functions
are not template yet (only easing_none and easing_bounce are template)
but will be in a few days. single_tweener has two template parameters,
which are the type V of the tweened values and the scalar type S
associated with V. All other classes do not need V and use only S.

There are some points on which I would like to have a feedback:

1. single_tweener takes a reference to std::swap<V> (see line 90 of

  boost::bind( &std::swap<value_type>, boost::ref(val), _1 );

On the non-template version, value_type was double and this line caused
a compilation error on Mac:
  error: no matching function for call to 'bind(<unresolved overloaded
  function type>, const boost::reference_wrapper<double>,

The workaround was to use a custom non-template swap function. Do you
have an idea on how to avoid the same issue in the new code?

2. The current directory structure looks like this:
├── include
│   └── boost
│   └── tweener
│   ├── detail
│   │   └── impl
│   │   └── easing
│   └── easing
└── test

There is also a doc and examples folder but they are currently empty and
thus not in the git repository. I'm not sure about the
detail/impl/easing tree. Should I put the implementation of the easing
functions in boost/tweener/easing/detail/impl instead?

3. Is there a prefered place to store the git repository?


Julien Jorge

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