File indexing completed on 2025-02-23 09:59:01
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0013 #ifndef BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_HPP
0014 #define BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_HPP
0015
0016 #include <boost/variant/detail/apply_visitor_unary.hpp>
0017 #include <boost/variant/detail/apply_visitor_binary.hpp>
0018 #include <boost/variant/variant_fwd.hpp>
0019
0020
0021 #include <boost/variant/detail/has_result_type.hpp>
0022 #include <boost/core/enable_if.hpp>
0023
0024 namespace boost {
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0041 template <typename Visitor>
0042 class apply_visitor_delayed_t
0043 {
0044 public:
0045
0046 typedef typename Visitor::result_type
0047 result_type;
0048
0049 private:
0050
0051 Visitor& visitor_;
0052
0053 public:
0054
0055 explicit apply_visitor_delayed_t(Visitor& visitor) BOOST_NOEXCEPT
0056 : visitor_(visitor)
0057 {
0058 }
0059
0060 public:
0061 template <typename... Visitables>
0062 result_type operator()(Visitables&... visitables) const
0063 {
0064 return apply_visitor(visitor_, visitables...);
0065 }
0066
0067 private:
0068 apply_visitor_delayed_t& operator=(const apply_visitor_delayed_t&);
0069
0070 };
0071
0072 template <typename Visitor>
0073 inline typename boost::enable_if<
0074 boost::detail::variant::has_result_type<Visitor>,
0075 apply_visitor_delayed_t<Visitor>
0076 >::type apply_visitor(Visitor& visitor)
0077 {
0078 return apply_visitor_delayed_t<Visitor>(visitor);
0079 }
0080
0081 #if !defined(BOOST_NO_CXX14_DECLTYPE_AUTO)
0082
0083 template <typename Visitor>
0084 class apply_visitor_delayed_cpp14_t
0085 {
0086 private:
0087 Visitor& visitor_;
0088
0089 public:
0090
0091 explicit apply_visitor_delayed_cpp14_t(Visitor& visitor) BOOST_NOEXCEPT
0092 : visitor_(visitor)
0093 {
0094 }
0095
0096 public:
0097 template <typename... Visitables>
0098 decltype(auto) operator()(Visitables&... visitables) const
0099 {
0100 return apply_visitor(visitor_, visitables...);
0101 }
0102
0103 private:
0104 apply_visitor_delayed_cpp14_t& operator=(const apply_visitor_delayed_cpp14_t&);
0105
0106 };
0107
0108 template <typename Visitor>
0109 inline typename boost::disable_if<
0110 boost::detail::variant::has_result_type<Visitor>,
0111 apply_visitor_delayed_cpp14_t<Visitor>
0112 >::type apply_visitor(Visitor& visitor)
0113 {
0114 return apply_visitor_delayed_cpp14_t<Visitor>(visitor);
0115 }
0116
0117 #endif
0118
0119
0120 }
0121
0122 #endif