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What's New? Intel® Threading Building Blocks 4.3 Update 4

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Changes (w.r.t. Intel TBB 4.3 Update 3):
- Added a C++11 variadic constructor for enumerable_thread_specific.
    The arguments from this constructor are used to construct
    thread-local values.
- Improved exception safety for enumerable_thread_specific.
- Added documentation for tbb::flow::tagged_msg class and
    tbb::flow::output_port function.
- Fixed build errors for systems that do not support dynamic linking.
- C++11 move aware insert and emplace methods have been added to
    concurrent unordered containers.

Preview Features:
- Interface-breaking change: typedefs changed for node predecessor and
    successor lists, affecting copy_predecessors and copy_successors
    methods.
- Added template class composite_node to the flow graph API. It packages
    a subgraph to represent it as a first-class flow graph node.
- make_edge and remove_edge now accept multiport nodes as arguments,
    automatically using the node port with index 0 for an edge.

Open-source contributions integrated:
- Draft code for enumerable_thread_specific constructor with multiple
    arguments (see above) by Adrien Guinet.
- Fix for GCC invocation on IBM* Blue Gene*
    by Jeff Hammond and Raf Schietekat.
- Extended testing with smart pointers for Clang & libc++
    by Raf Schietekat.


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