forked from boostorg/optional
960631e201ee2e0906081acbab31a2dfec6891f3
[SVN r71048]
Refs #4987. Added forward declaration of namespace-scope swap for boost::optional, this should fix GCC compilation errors. Also swap implementation now uses Boost.Utility.Swap to make use of the workarounds for some broken compilers. If it breaks for your compiler, let me know in the mentioned ticket.
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Boost.org optional module
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