ceph/src/boost/libs/variant/test/variant_multivisit_test.cpp

   1 //-----------------------------------------------------------------------------
   2 // boost-libs variant/test/variant_multivisit_test.cpp source file
   3 // See http://www.boost.org for updates, documentation, and revision history.
   4 //-----------------------------------------------------------------------------
   5 //
   6 // Copyright (c) 2013-2022 Antony Polukhin
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See
   9 // accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11
  12 #include "boost/config.hpp"
  13 #include "boost/noncopyable.hpp"
  14 #define BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS 5
  15 #include "boost/variant/multivisitors.hpp"
  16 #include "boost/variant.hpp"
  17
  18 #include "boost/core/lightweight_test.hpp"
  19
  20 struct my_noncopyable : boost::noncopyable {
  21     my_noncopyable(){}
  22     ~my_noncopyable(){}
  23 };
  24
  25 typedef boost::variant<my_noncopyable, int>         variant_noncopy_t;
  26
  27
  28 typedef boost::variant<char, unsigned char, signed char, unsigned short, int>         variant5_t;
  29
  30 struct test_visitor: boost::static_visitor<> {
  31     // operators that shall not be called
  32     template <class  T1, class  T2, class  T3>
  33     void operator()(T1&, T2&, T3&) const
  34     {
  35         BOOST_TEST(false);
  36     }
  37
  38     template <class  T1, class  T2, class  T3, class  T4>
  39     void operator()(T1&, T2&, T3&, T4&) const
  40     {
  41         BOOST_TEST(false);
  42     }
  43
  44     template <class  T1, class  T2, class  T3, class  T4, class  T5>
  45     void operator()(T1&, T2&, T3&, T4&, T5&) const
  46     {
  47         BOOST_TEST(false);
  48     }
  49
  50     // operators that are OK to call
  51     void operator()(char v0, unsigned char v1, signed char v2) const
  52     {
  53         BOOST_TEST(v0 == 0);
  54         BOOST_TEST(v1 == 1);
  55         BOOST_TEST(v2 == 2);
  56     }
  57
  58     void operator()(char v0, unsigned char v1, signed char v2, unsigned short v3) const
  59     {
  60         BOOST_TEST(v0 == 0);
  61         BOOST_TEST(v1 == 1);
  62         BOOST_TEST(v2 == 2);
  63         BOOST_TEST(v3 == 3);
  64     }
  65
  66     void operator()(char v0, unsigned char v1, signed char v2, unsigned short v3, int v4) const
  67     {
  68         BOOST_TEST(v0 == 0);
  69         BOOST_TEST(v1 == 1);
  70         BOOST_TEST(v2 == 2);
  71         BOOST_TEST(v3 == 3);
  72         BOOST_TEST(v4 == 4);
  73     }
  74
  75
  76     // Noncopyables
  77     void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
  78         BOOST_TEST(true);
  79     }
  80     void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
  81         BOOST_TEST(true);
  82     }
  83     void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
  84         BOOST_TEST(true);
  85     }
  86     void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
  87         BOOST_TEST(true);
  88     }
  89 };
  90
  91 typedef boost::variant<int, double, bool> bool_like_t;
  92 typedef boost::variant<int, double> arithmetics_t;
  93
  94 struct if_visitor: public boost::static_visitor<arithmetics_t> {
  95     template <class T0, class T1, class T2>
  96     arithmetics_t operator()(T0 b, T1 v1, T2 v2) const {
  97         if (!!b) {
  98             return v1;
  99         } else {
 100             return v2;
 101         }
 102     }
 103 };
 104
 105
 106 int main()
 107 {
 108     test_visitor v;
 109
 110     variant5_t v_array5[5];
 111     v_array5[0] = char(0);
 112     v_array5[1] = static_cast<unsigned char>(1);
 113     v_array5[2] = static_cast<signed char>(2);
 114     v_array5[3] = static_cast<unsigned short>(3);
 115     v_array5[4] = static_cast<int>(4);
 116
 117     boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2]);
 118     boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2]);
 119
 120 // Following test also pass, but requires many Gigabytes of RAM for compilation and compile for about 15 minutes
 121 //#define BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
 122 #ifdef BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
 123     boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2], v_array5[3]);
 124     boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2], v_array5[3]);
 125
 126     boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2], v_array5[3], v_array5[4]);
 127     boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2], v_array5[3], v_array5[4]);
 128 #endif
 129
 130     bool_like_t v0(1), v1(true), v2(1.0);
 131
 132     BOOST_TEST(
 133         boost::apply_visitor(if_visitor(), v0, v1, v2)
 134         ==
 135         arithmetics_t(true)
 136     );
 137
 138 #if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
 139     if_visitor if_vis;
 140     BOOST_TEST(
 141         boost::apply_visitor(if_vis)(v0, v1, v2)
 142         ==
 143         arithmetics_t(true)
 144     );
 145 #endif
 146
 147
 148     variant_noncopy_t vnonc[6];
 149     boost::apply_visitor(v, vnonc[0], vnonc[1], vnonc[2]);
 150     boost::apply_visitor(test_visitor(), vnonc[0], vnonc[1], vnonc[2], vnonc[3]);
 151
 152 #ifdef BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
 153     boost::apply_visitor(v, vnonc[0], vnonc[1], vnonc[2], vnonc[3], vnonc[4]);
 154     boost::apply_visitor(test_visitor(), vnonc[0], vnonc[1], vnonc[2], vnonc[3], vnonc[4], vnonc[5]);
 155 #endif
 156
 157     return boost::report_errors();
 158 }