Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Function apply_visitor /*three or more variant parameters*/

Function apply_visitor /three or more variant parameters/

boost::apply_visitor /*three or more variant parameters*/

Synopsis

// In header: <boost/variant/multivisitors.hpp>


template<typename MultiVisitor, typename Variant1, typename Variant2, 
         typename Variant3> 
  typename MultiVisitor::result_type OR decltype(auto) 
  apply_visitor /*three or more variant parameters*/(MultiVisitor & visitor, 
                                                     Variant1&& operand1, 
                                                     Variant2&& operand2, 
                                                     Variant3&& operand3, 
                                                     ... other_operands);
template<typename MultiVisitor, typename Variant1, typename Variant2, 
         typename Variant3> 
  typename MultiVisitor::result_type OR decltype(auto) 
  apply_visitor /*three or more variant parameters*/(const MultiVisitor & visitor, 
                                                     Variant1&& operand1, 
                                                     Variant2&& operand2, 
                                                     Variant3&& operand3, 
                                                     ... other_operands);

Description

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.