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boost::apply_visitor /*three or more variant parameters*/
// In header: <boost/variant/multivisitors.hpp> template<typename MultiVisitor, typename Variant1, typename Variant2, typename Variant3> ( visitor, operand1, operand2, operand3, ... other_operands); template<typename MultiVisitor, typename Variant1, typename Variant2, typename Variant3> ( visitor, operand1, operand2, operand3, ... other_operands);
Allows compile-time checked type-safe application of the
given visitor to the content of the given variant, ensuring that all
types are handled by the visitor. See apply_visitor
for more information.