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//-----------------------------------------------------------------------------
// boost-libs variant/test/variant_visit_test.cpp source file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// 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/variant/variant.hpp"
#include "boost/variant/apply_visitor.hpp"
#include "boost/variant/static_visitor.hpp"
#include "boost/core/lightweight_test.hpp"
#include "boost/mpl/bool.hpp"
#include "boost/mpl/and.hpp"
#include "boost/type_traits/is_same.hpp"
struct udt1
{
};
struct udt2
{
};
template <typename T>
class unary_check_content_type
: public boost::static_visitor<bool>
{
public:
// not recommended design, but simplifies workarounds:
template <typename U>
bool operator()(U&) const
{
return ::boost::is_same<T,U>::value;
}
};
template <typename T1, typename T2>
class binary_check_content_type
: public boost::static_visitor<bool>
{
public:
// not recommended design, but simplifies workarounds:
template <typename U1, typename U2>
bool operator()(U1&, U2&) const
{
return ::boost::mpl::and_<
boost::is_same<T1,U1>
, boost::is_same<T2,U2>
>::value;
}
};
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS // BOOST_NO_CXX11_RVALUE_REFERENCES is not enough for disabling buggy GCCs < 4.8
struct rvalue_ref_visitor
{
typedef int result_type;
int operator()(udt1&&) const { return 0; }
int operator()(udt2&&) const { return 1; }
};
#endif
#ifdef BOOST_VARIANT_HAS_DECLTYPE_APPLY_VISITOR_RETURN_TYPE
struct rvalue_ref_decltype_visitor
{
int operator()(udt1&&) const { return 0; }
int operator()(udt2&&) const { return 1; }
};
#endif
template <typename Checker, typename Variant>
inline void unary_test(Variant& var, Checker* = nullptr)
{
Checker checker;
const Checker& const_checker = checker;
// standard tests
BOOST_TEST( boost::apply_visitor(checker, var) );
BOOST_TEST( boost::apply_visitor(const_checker, var) );
BOOST_TEST( boost::apply_visitor(Checker(), var) );
// delayed tests
BOOST_TEST( boost::apply_visitor(checker)(var) );
BOOST_TEST( boost::apply_visitor(const_checker)(var) );
}
template <typename Checker, typename Variant1, typename Variant2>
inline void binary_test(Variant1& var1, Variant2& var2, Checker* = nullptr)
{
Checker checker;
const Checker& const_checker = checker;
// standard tests
BOOST_TEST( boost::apply_visitor(checker, var1, var2) );
BOOST_TEST( boost::apply_visitor(const_checker, var1, var2) );
BOOST_TEST( boost::apply_visitor(Checker(), var1, var2) );
// delayed tests
BOOST_TEST( boost::apply_visitor(checker)(var1, var2) );
BOOST_TEST( boost::apply_visitor(const_checker)(var1, var2) );
}
int main()
{
typedef boost::variant<udt1,udt2> var_t;
udt1 u1;
var_t var1(u1);
udt2 u2;
var_t var2(u2);
const var_t& cvar1 = var1;
const var_t& cvar2 = var2;
//
// unary tests
//
typedef unary_check_content_type<udt1> check1_t;
typedef unary_check_content_type<const udt1> check1_const_t;
typedef unary_check_content_type<udt2> check2_t;
typedef unary_check_content_type<const udt2> check2_const_t;
unary_test< check1_t >(var1);
unary_test< check1_const_t >(cvar1);
unary_test< check2_t >(var2);
unary_test< check2_const_t >(cvar2);
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS // BOOST_NO_CXX11_RVALUE_REFERENCES is not enough for disabling buggy GCCs < 4.8
BOOST_TEST_EQ( (boost::apply_visitor(
rvalue_ref_visitor(),
boost::variant<udt1, udt2>(udt2()))), 1 );
#endif
#ifdef BOOST_VARIANT_HAS_DECLTYPE_APPLY_VISITOR_RETURN_TYPE
BOOST_TEST_EQ( (boost::apply_visitor(
rvalue_ref_decltype_visitor(),
boost::variant<udt1, udt2>(udt2()))), 1 );
#endif
//
// binary tests
//
typedef binary_check_content_type<udt1,udt2> check12_t;
typedef binary_check_content_type<const udt1, const udt2> check12_const_t;
typedef binary_check_content_type<udt2,udt1> check21_t;
typedef binary_check_content_type<const udt2, const udt1> check21_const_t;
binary_test< check12_t >(var1,var2);
binary_test< check12_const_t >(cvar1,cvar2);
binary_test< check21_t >(var2,var1);
binary_test< check21_const_t >(cvar2,cvar1);
return boost::report_errors();
}
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