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Fix: prevented the binding illegal temporary to optional<const int&>
Older MSVC versions add illegal temporary when you want to assign from const integral value.
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@ -16,6 +16,7 @@
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* Now `boost::optional` is specialized for reference parameters. This addresses a couple of issues:
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* the `sizeof` of optional reference is that of a pointer,
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* some bugs connected to copying optional references are gone,
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* all run-time bugs caused by incorrect reference binding on some compilers are now turned into compile-time errors,
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* you can swap optional references: it is like swapping pointers: shalow, underlying objects are not affected,
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* optional references to abstract types work.
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* Documented nested typedefs ([@https://svn.boost.org/trac/boost/ticket/5193 Trac #5193]).
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