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//-----------------------------------------------------------------------------
// boost-libs variant/test/variant_multivisit_test.cpp source file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2013-2025 Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/config.hpp"
#include "boost/noncopyable.hpp"
#define BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS 5
#include "boost/variant/multivisitors.hpp"
#include "boost/variant.hpp"
#include "boost/core/lightweight_test.hpp"
struct my_noncopyable : boost::noncopyable {
my_noncopyable(){}
~my_noncopyable(){}
};
typedef boost::variant<my_noncopyable, int> variant_noncopy_t;
typedef boost::variant<char, unsigned char, signed char, unsigned short, int> variant5_t;
struct test_visitor: boost::static_visitor<> {
// operators that shall not be called
template <class T1, class T2, class T3>
void operator()(T1&, T2&, T3&) const
{
BOOST_TEST(false);
}
template <class T1, class T2, class T3, class T4>
void operator()(T1&, T2&, T3&, T4&) const
{
BOOST_TEST(false);
}
template <class T1, class T2, class T3, class T4, class T5>
void operator()(T1&, T2&, T3&, T4&, T5&) const
{
BOOST_TEST(false);
}
// operators that are OK to call
void operator()(char v0, unsigned char v1, signed char v2) const
{
BOOST_TEST(v0 == 0);
BOOST_TEST(v1 == 1);
BOOST_TEST(v2 == 2);
}
void operator()(char v0, unsigned char v1, signed char v2, unsigned short v3) const
{
BOOST_TEST(v0 == 0);
BOOST_TEST(v1 == 1);
BOOST_TEST(v2 == 2);
BOOST_TEST(v3 == 3);
}
void operator()(char v0, unsigned char v1, signed char v2, unsigned short v3, int v4) const
{
BOOST_TEST(v0 == 0);
BOOST_TEST(v1 == 1);
BOOST_TEST(v2 == 2);
BOOST_TEST(v3 == 3);
BOOST_TEST(v4 == 4);
}
// Noncopyables
void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
BOOST_TEST(true);
}
void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
BOOST_TEST(true);
}
void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
BOOST_TEST(true);
}
void operator()(my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&, my_noncopyable&) const {
BOOST_TEST(true);
}
};
typedef boost::variant<int, double, bool> bool_like_t;
typedef boost::variant<int, double> arithmetics_t;
struct if_visitor: public boost::static_visitor<arithmetics_t> {
template <class T0, class T1, class T2>
arithmetics_t operator()(T0 b, T1 v1, T2 v2) const {
if (!!b) {
return v1;
} else {
return v2;
}
}
};
int main()
{
test_visitor v;
variant5_t v_array5[5];
v_array5[0] = char(0);
v_array5[1] = static_cast<unsigned char>(1);
v_array5[2] = static_cast<signed char>(2);
v_array5[3] = static_cast<unsigned short>(3);
v_array5[4] = static_cast<int>(4);
boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2]);
boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2]);
// Following test also pass, but requires many Gigabytes of RAM for compilation and compile for about 15 minutes
//#define BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
#ifdef BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2], v_array5[3]);
boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2], v_array5[3]);
boost::apply_visitor(v, v_array5[0], v_array5[1], v_array5[2], v_array5[3], v_array5[4]);
boost::apply_visitor(test_visitor(), v_array5[0], v_array5[1], v_array5[2], v_array5[3], v_array5[4]);
#endif
bool_like_t v0(1), v1(true), v2(1.0);
BOOST_TEST(
boost::apply_visitor(if_visitor(), v0, v1, v2)
==
arithmetics_t(true)
);
if_visitor if_vis;
BOOST_TEST(
boost::apply_visitor(if_vis)(v0, v1, v2)
==
arithmetics_t(true)
);
variant_noncopy_t vnonc[6];
boost::apply_visitor(v, vnonc[0], vnonc[1], vnonc[2]);
boost::apply_visitor(test_visitor(), vnonc[0], vnonc[1], vnonc[2], vnonc[3]);
#ifdef BOOST_VARIANT_MULTIVISITORS_TEST_VERY_EXTREME
boost::apply_visitor(v, vnonc[0], vnonc[1], vnonc[2], vnonc[3], vnonc[4]);
boost::apply_visitor(test_visitor(), vnonc[0], vnonc[1], vnonc[2], vnonc[3], vnonc[4], vnonc[5]);
#endif
return boost::report_errors();
}
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