forked from boostorg/optional
776ed89fb398f089a890f27fc9cd0576c6d3ded1
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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