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//-----------------------------------------------------------------------------
// boost-libs variant/test/variant_get_test.cpp source file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2014-2025 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)
#ifdef _MSC_VER
#pragma warning(disable: 4127) // conditional expression is constant
#pragma warning(disable: 4181) // qualifier applied to reference type; ignored
#endif
#include "boost/variant/get.hpp"
#include "boost/variant/variant.hpp"
#include "boost/variant/polymorphic_get.hpp"
#include "boost/variant/recursive_wrapper.hpp"
#include "boost/core/lightweight_test.hpp"
struct base {
int trash;
base() : trash(123) {}
base(const base& b) : trash(b.trash) { int i = 100; (void)i; }
const base& operator=(const base& b) {
trash = b.trash;
int i = 100; (void)i;
return *this;
}
virtual ~base(){}
};
struct derived1 : base{};
struct derived2 : base{};
struct vbase { short trash; virtual ~vbase(){} virtual int foo() const { return 0; } };
struct vderived1 : virtual vbase{ virtual int foo() const { return 1; } };
struct vderived2 : virtual vbase{ virtual int foo() const { return 3; } };
struct vderived3 : vderived1, vderived2 { virtual int foo() const { return 3; } };
typedef boost::variant<int, base, derived1, derived2, std::string> var_t;
typedef boost::variant<int, derived1, derived2, std::string> var_t_shortened;
typedef boost::variant<base, derived1, derived2> var_t_no_fallback;
typedef boost::variant<int&, base&, derived1&, derived2&, std::string&> var_ref_t;
typedef boost::variant<const int&, const base&, const derived1&, const derived2&, const std::string&> var_cref_t;
struct recursive_structure;
typedef boost::variant<
int, base, derived1, derived2, std::string, boost::recursive_wrapper<recursive_structure>
> var_req_t;
struct recursive_structure { var_req_t var; };
template <class TypeInVariant, class V, class TestType>
inline void check_polymorphic_get_on_types_impl_single_type(V* v)
{
typedef typename boost::add_reference<TestType>::type ref_test_t;
typedef typename boost::add_reference<const TestType>::type cref_test_t;
const bool exact_same = !!boost::is_same<TypeInVariant, TestType>::value;
const bool ref_same = !!boost::is_same<TypeInVariant, ref_test_t>::value;
if (exact_same || ref_same) {
BOOST_TEST(boost::polymorphic_get<TestType>(v));
BOOST_TEST(boost::polymorphic_get<const TestType>(v));
BOOST_TEST(boost::polymorphic_strict_get<TestType>(v));
BOOST_TEST(boost::polymorphic_strict_get<const TestType>(v));
BOOST_TEST(boost::polymorphic_relaxed_get<TestType>(v));
BOOST_TEST(boost::polymorphic_relaxed_get<const TestType>(v));
BOOST_TEST(boost::polymorphic_get<cref_test_t>(v));
BOOST_TEST(boost::polymorphic_strict_get<cref_test_t>(v));
BOOST_TEST(boost::polymorphic_relaxed_get<cref_test_t>(v));
if (ref_same) {
BOOST_TEST(boost::polymorphic_get<ref_test_t>(v));
BOOST_TEST(boost::polymorphic_get<cref_test_t>(v));
BOOST_TEST(boost::polymorphic_strict_get<ref_test_t>(v));
BOOST_TEST(boost::polymorphic_strict_get<cref_test_t>(v));
BOOST_TEST(boost::polymorphic_relaxed_get<ref_test_t>(v));
BOOST_TEST(boost::polymorphic_relaxed_get<cref_test_t>(v));
}
} else {
BOOST_TEST(!boost::polymorphic_get<TestType>(v));
BOOST_TEST(!boost::polymorphic_get<const TestType>(v));
BOOST_TEST(!boost::polymorphic_strict_get<TestType>(v));
BOOST_TEST(!boost::polymorphic_strict_get<const TestType>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<TestType>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<const TestType>(v));
}
}
template <class T, class V, class TestType>
inline void check_get_on_types_impl_single_type(V* v)
{
typedef typename boost::add_reference<TestType>::type ref_test_t;
typedef typename boost::add_reference<const TestType>::type cref_test_t;
const bool exact_same = !!boost::is_same<T, TestType>::value;
const bool ref_same = !!boost::is_same<T, ref_test_t>::value;
if (exact_same || ref_same) {
BOOST_TEST(boost::get<TestType>(v));
BOOST_TEST(boost::get<const TestType>(v));
BOOST_TEST(boost::strict_get<TestType>(v));
BOOST_TEST(boost::strict_get<const TestType>(v));
BOOST_TEST(boost::relaxed_get<TestType>(v));
BOOST_TEST(boost::relaxed_get<const TestType>(v));
BOOST_TEST(boost::get<cref_test_t>(v));
BOOST_TEST(boost::strict_get<cref_test_t>(v));
BOOST_TEST(boost::relaxed_get<cref_test_t>(v));
if (ref_same) {
BOOST_TEST(boost::get<ref_test_t>(v));
BOOST_TEST(boost::get<cref_test_t>(v));
BOOST_TEST(boost::strict_get<ref_test_t>(v));
BOOST_TEST(boost::strict_get<cref_test_t>(v));
BOOST_TEST(boost::relaxed_get<ref_test_t>(v));
BOOST_TEST(boost::relaxed_get<cref_test_t>(v));
}
} else {
BOOST_TEST(!boost::get<TestType>(v));
BOOST_TEST(!boost::get<const TestType>(v));
BOOST_TEST(!boost::strict_get<TestType>(v));
BOOST_TEST(!boost::strict_get<const TestType>(v));
BOOST_TEST(!boost::relaxed_get<TestType>(v));
BOOST_TEST(!boost::relaxed_get<const TestType>(v));
}
}
template <class T, class V>
inline void check_get_on_types_impl(V* v)
{
check_get_on_types_impl_single_type<T, V, int>(v);
check_polymorphic_get_on_types_impl_single_type<T, V, int>(v);
check_get_on_types_impl_single_type<T, V, base>(v);
check_get_on_types_impl_single_type<T, V, derived1>(v);
check_polymorphic_get_on_types_impl_single_type<T, V, derived1>(v);
check_get_on_types_impl_single_type<T, V, derived2>(v);
check_polymorphic_get_on_types_impl_single_type<T, V, derived2>(v);
check_get_on_types_impl_single_type<T, V, std::string>(v);
check_polymorphic_get_on_types_impl_single_type<T, V, std::string>(v);
// Never exist in here
BOOST_TEST(!boost::relaxed_get<short>(v));
BOOST_TEST(!boost::relaxed_get<const short>(v));
BOOST_TEST(!boost::relaxed_get<char>(v));
BOOST_TEST(!boost::relaxed_get<char*>(v));
BOOST_TEST(!boost::relaxed_get<bool>(v));
BOOST_TEST(!boost::relaxed_get<const bool>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<short>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<const short>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<char>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<char*>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<bool>(v));
BOOST_TEST(!boost::polymorphic_relaxed_get<const bool>(v));
boost::get<T>(*v); // Must compile
boost::get<const T>(*v); // Must compile
boost::strict_get<T>(*v); // Must compile
boost::strict_get<const T>(*v); // Must compile
bool is_ref = boost::is_lvalue_reference<T>::value;
(void)is_ref;
if (!is_ref) {
boost::polymorphic_get<T>(*v); // Must compile
boost::polymorphic_get<const T>(*v); // Must compile
boost::polymorphic_strict_get<T>(*v); // Must compile
boost::polymorphic_strict_get<const T>(*v); // Must compile
}
}
template <class T, class V>
inline void check_get_on_types(V* v)
{
check_get_on_types_impl<T, V>(v);
check_get_on_types_impl<T, const V>(v);
}
inline void get_test()
{
var_t v;
check_get_on_types<int>(&v);
var_t(base()).swap(v);
check_get_on_types<base>(&v);
var_t(derived1()).swap(v);
check_get_on_types<derived1>(&v);
var_t(derived2()).swap(v);
check_get_on_types<derived2>(&v);
var_t(std::string("Hello")).swap(v);
check_get_on_types<std::string>(&v);
var_t_shortened vs = derived2();
check_polymorphic_get_on_types_impl_single_type<derived2, var_t_shortened, int>(&vs);
check_polymorphic_get_on_types_impl_single_type<derived2, const var_t_shortened, int>(&vs);
// Checking that Base is really determinated
check_polymorphic_get_on_types_impl_single_type<base, var_t_shortened, base>(&vs);
check_polymorphic_get_on_types_impl_single_type<base, const var_t_shortened, base>(&vs);
vs = derived1();
check_polymorphic_get_on_types_impl_single_type<derived2, var_t_shortened, int>(&vs);
check_polymorphic_get_on_types_impl_single_type<derived2, const var_t_shortened, int>(&vs);
// Checking that Base is really determinated
check_polymorphic_get_on_types_impl_single_type<base, var_t_shortened, base>(&vs);
check_polymorphic_get_on_types_impl_single_type<base, const var_t_shortened, base>(&vs);
}
inline void get_test_no_fallback()
{
var_t_no_fallback v;
var_t_no_fallback(base()).swap(v);
check_polymorphic_get_on_types_impl_single_type<base, var_t_no_fallback, base>(&v);
check_polymorphic_get_on_types_impl_single_type<base, const var_t_no_fallback, base>(&v);
check_get_on_types_impl_single_type<base, var_t_no_fallback, base>(&v);
check_get_on_types_impl_single_type<base, const var_t_no_fallback, base>(&v);
var_t_no_fallback(derived1()).swap(v);
check_polymorphic_get_on_types_impl_single_type<base, var_t_no_fallback, base>(&v);
check_polymorphic_get_on_types_impl_single_type<base, const var_t_no_fallback, base>(&v);
check_get_on_types_impl_single_type<derived1, var_t_no_fallback, derived1>(&v);
check_get_on_types_impl_single_type<derived1, const var_t_no_fallback, derived1>(&v);
var_t_no_fallback(derived2()).swap(v);
check_polymorphic_get_on_types_impl_single_type<base, var_t_no_fallback, base>(&v);
check_polymorphic_get_on_types_impl_single_type<base, const var_t_no_fallback, base>(&v);
check_get_on_types_impl_single_type<derived2, var_t_no_fallback, derived2>(&v);
check_get_on_types_impl_single_type<derived2, const var_t_no_fallback, derived2>(&v);
}
inline void get_ref_test()
{
int i = 0;
var_ref_t v(i);
check_get_on_types<int>(&v);
check_get_on_types<int&>(&v);
base b;
var_ref_t v1(b);
check_get_on_types<base>(&v1);
check_get_on_types<base&>(&v1);
derived1 d1;
var_ref_t v2(d1);
check_get_on_types<derived1>(&v2);
check_get_on_types<derived1&>(&v2);
derived2 d2;
var_ref_t v3(d2);
check_get_on_types<derived2>(&v3);
check_get_on_types<derived2&>(&v3);
std::string s("Hello");
var_ref_t v4(s);
check_get_on_types<std::string>(&v4);
check_get_on_types<std::string&>(&v4);
}
inline void get_cref_test()
{
int i = 0;
var_cref_t v(i);
BOOST_TEST(boost::get<const int>(&v));
BOOST_TEST(boost::get<const int&>(&v));
BOOST_TEST(!boost::get<const base>(&v));
base b;
var_cref_t v1(b);
BOOST_TEST(boost::get<const base>(&v1));
BOOST_TEST(!boost::get<const derived1>(&v1));
BOOST_TEST(!boost::get<const int>(&v1));
std::string s("Hello");
const var_cref_t v4 = s;
BOOST_TEST(boost::get<const std::string>(&v4));
BOOST_TEST(!boost::get<const int>(&v4));
}
inline void get_recursive_test()
{
var_req_t v;
check_get_on_types<int>(&v);
var_req_t(base()).swap(v);
check_get_on_types<base>(&v);
var_req_t(derived1()).swap(v);
check_get_on_types<derived1>(&v);
var_req_t(derived2()).swap(v);
check_get_on_types<derived2>(&v);
var_req_t(std::string("Hello")).swap(v);
check_get_on_types<std::string>(&v);
recursive_structure s = { v }; // copying "v"
v = s;
check_get_on_types<recursive_structure>(&v);
}
template <class T>
inline void check_that_does_not_exist_impl()
{
using namespace boost::detail::variant;
BOOST_TEST((holds_element<T, const int>::value));
BOOST_TEST((!holds_element<T, short>::value));
BOOST_TEST((!holds_element<T, short>::value));
BOOST_TEST((!holds_element<T, const short>::value));
BOOST_TEST((!holds_element<T, char*>::value));
BOOST_TEST((!holds_element<T, const char*>::value));
BOOST_TEST((!holds_element<T, char[5]>::value));
BOOST_TEST((!holds_element<T, const char[5]>::value));
BOOST_TEST((!holds_element<T, bool>::value));
BOOST_TEST((!holds_element<T, const bool>::value));
BOOST_TEST((!holds_element<T, boost::recursive_wrapper<int> >::value));
BOOST_TEST((!holds_element<T, boost::recursive_wrapper<short> >::value));
BOOST_TEST((!holds_element<T, boost::detail::reference_content<short> >::value));
BOOST_TEST((holds_element_polymorphic<T, const int>::value));
BOOST_TEST((!holds_element_polymorphic<T, short>::value));
BOOST_TEST((!holds_element_polymorphic<T, short>::value));
BOOST_TEST((!holds_element_polymorphic<T, const short>::value));
BOOST_TEST((!holds_element_polymorphic<T, char*>::value));
BOOST_TEST((!holds_element_polymorphic<T, const char*>::value));
BOOST_TEST((!holds_element_polymorphic<T, char[5]>::value));
BOOST_TEST((!holds_element_polymorphic<T, const char[5]>::value));
BOOST_TEST((!holds_element_polymorphic<T, bool>::value));
BOOST_TEST((!holds_element_polymorphic<T, const bool>::value));
BOOST_TEST((!holds_element_polymorphic<T, boost::recursive_wrapper<int> >::value));
BOOST_TEST((!holds_element_polymorphic<T, boost::recursive_wrapper<short> >::value));
BOOST_TEST((!holds_element_polymorphic<T, boost::detail::reference_content<short> >::value));
}
inline void check_that_does_not_exist()
{
using namespace boost::detail::variant;
BOOST_TEST((holds_element<var_t, int>::value));
BOOST_TEST((holds_element<var_ref_t, int>::value));
BOOST_TEST((!holds_element<var_cref_t, int>::value));
check_that_does_not_exist_impl<var_t>();
check_that_does_not_exist_impl<var_ref_t>();
check_that_does_not_exist_impl<var_cref_t>();
check_that_does_not_exist_impl<var_req_t>();
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
class MoveonlyType {
public:
MoveonlyType() {}
~MoveonlyType() {}
MoveonlyType(MoveonlyType&&) {}
void operator=(MoveonlyType&&) {}
private:
MoveonlyType(const MoveonlyType&);
void operator=(const MoveonlyType&);
};
const boost::variant<int, std::string> foo1() { return ""; }
boost::variant<int, std::string> foo2() { return ""; }
inline void get_rvref_test()
{
boost::get<std::string>(foo1());
boost::get<std::string>(foo2());
boost::variant<MoveonlyType, int> v;
v = MoveonlyType();
boost::get<MoveonlyType>(std::move(v));
v = 3;
v = MoveonlyType();
boost::get<MoveonlyType>(v);
boost::relaxed_get<MoveonlyType&>(boost::variant<MoveonlyType, int>());
v = MoveonlyType();
MoveonlyType moved_from_variant(boost::get<MoveonlyType>(std::move(v)));
}
#endif // BOOST_NO_CXX11_RVALUE_REFERENCES
int main()
{
get_test();
get_test_no_fallback();
get_ref_test();
get_cref_test();
get_recursive_test();
check_that_does_not_exist();
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
get_rvref_test();
#endif
return boost::report_errors();
}
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