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typedef boost::variant<int, double> Type; class Append: public boost::static_visitor<> { public: void operator()(int) {} void operator()(double) {} }; Type type(1.2); Visitor visitor; boost::apply_visitor(visitor, type); Is it possible to change the visitor such that it receives extra data as follows: class Append: public boost::static_visitor<> { public: void operator()(int, const std::string&) {} void operator()(double, const std::string&) {} }; This string value changes during the lifetime of the Append object. Passing the string in via the constructor is not an option in this case.
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