enum class _Trait { _TriviallyAvailable, _Available, _Unavailable };
-template <typename _Tp,
- template <typename> class _IsTriviallyAvailable,
- template <typename> class _IsAvailable>
+template <class _Tp,
+ template <class> class _IsTriviallyAvailable,
+ template <class> class _IsAvailable>
constexpr _Trait __trait =
_IsTriviallyAvailable<_Tp>::value
? _Trait::_TriviallyAvailable
return __result;
}
-template <typename... _Types>
+template <class... _Types>
struct __traits {
static constexpr _Trait __copy_constructible_trait =
__common_trait({__trait<_Types,
namespace __visitation {
-struct __base {
- template <class _Visitor, class... _Vs>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr decltype(auto)
- __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) {
- constexpr auto __fdiagonal =
- __make_fdiagonal<_Visitor&&,
- decltype(_VSTD::forward<_Vs>(__vs).__as_base())...>();
- return __fdiagonal[__index](_VSTD::forward<_Visitor>(__visitor),
- _VSTD::forward<_Vs>(__vs).__as_base()...);
- }
+#define _LIBCPP_VARIANT_CASES_4(_Case, _Base) \
+ _Case(_Base + 0) \
+ _Case(_Base + 1) \
+ _Case(_Base + 2) \
+ _Case(_Base + 3)
- template <class _Visitor, class... _Vs>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor,
- _Vs&&... __vs) {
- constexpr auto __fmatrix =
- __make_fmatrix<_Visitor&&,
- decltype(_VSTD::forward<_Vs>(__vs).__as_base())...>();
- return __at(__fmatrix, __vs.index()...)(
- _VSTD::forward<_Visitor>(__visitor),
- _VSTD::forward<_Vs>(__vs).__as_base()...);
- }
+#define _LIBCPP_VARIANT_CASES_16(_Case, _Base) \
+ _LIBCPP_VARIANT_CASES_4(_Case, _Base + 4 * 0) \
+ _LIBCPP_VARIANT_CASES_4(_Case, _Base + 4 * 1) \
+ _LIBCPP_VARIANT_CASES_4(_Case, _Base + 4 * 2) \
+ _LIBCPP_VARIANT_CASES_4(_Case, _Base + 4 * 3)
-private:
- template <class _Tp>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr const _Tp& __at(const _Tp& __elem) { return __elem; }
+#define _LIBCPP_VARIANT_CASES_64(_Case, _Base) \
+ _LIBCPP_VARIANT_CASES_16(_Case, _Base + 16 * 0) \
+ _LIBCPP_VARIANT_CASES_16(_Case, _Base + 16 * 1) \
+ _LIBCPP_VARIANT_CASES_16(_Case, _Base + 16 * 2) \
+ _LIBCPP_VARIANT_CASES_16(_Case, _Base + 16 * 3)
- template <class _Tp, size_t _Np, typename... _Indices>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto&& __at(const array<_Tp, _Np>& __elems,
- size_t __index, _Indices... __indices) {
- return __at(__elems[__index], __indices...);
- }
+#define _LIBCPP_VARIANT_CASES_256(_Case, _Base) \
+ _LIBCPP_VARIANT_CASES_64(_Case, _Base + 64 * 0) \
+ _LIBCPP_VARIANT_CASES_64(_Case, _Base + 64 * 1) \
+ _LIBCPP_VARIANT_CASES_64(_Case, _Base + 64 * 2) \
+ _LIBCPP_VARIANT_CASES_64(_Case, _Base + 64 * 3)
- template <class _Fp, class... _Fs>
- static constexpr void __std_visit_visitor_return_type_check() {
- static_assert(
- __all<is_same_v<_Fp, _Fs>...>::value,
- "`std::visit` requires the visitor to have a single return type.");
- }
+#define _LIBCPP_VARIANT_CASES(_NumCases, _Case) \
+ _LIBCPP_CONCAT(_LIBCPP_VARIANT_CASES_, _NumCases)(_Case, 0)
- template <class... _Fs>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_farray(_Fs&&... __fs) {
- __std_visit_visitor_return_type_check<__uncvref_t<_Fs>...>();
- using __result = array<common_type_t<__uncvref_t<_Fs>...>, sizeof...(_Fs)>;
- return __result{{_VSTD::forward<_Fs>(__fs)...}};
- }
+#define _LIBCPP_VARIANT_SWITCH_MAX 256
- template <std::size_t... _Is>
- struct __dispatcher {
- template <class _Fp, class... _Vs>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr decltype(auto) __dispatch(_Fp __f, _Vs... __vs) {
- return __invoke_constexpr(
- static_cast<_Fp>(__f),
- __access::__base::__get_alt<_Is>(static_cast<_Vs>(__vs))...);
- }
- };
+template <class _Iter, class _Fp, size_t... _Is>
+inline _LIBCPP_INLINE_VISIBILITY
+static constexpr void __fill_cartesian_impl(
+ _Iter __iter, _Fp __f, index_sequence<_Is...>) {
+ *__iter = __f(integral_constant<size_t, _Is>{}...);
+}
- template <class _Fp, class... _Vs, size_t... _Is>
- inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_dispatch(index_sequence<_Is...>) {
- return __dispatcher<_Is...>::template __dispatch<_Fp, _Vs...>;
- }
+template <class _Iter, class _Fp, size_t... _Is, size_t... _Js, class... _Ls>
+inline _LIBCPP_INLINE_VISIBILITY
+static constexpr void __fill_cartesian_impl(
+ _Iter __iter, _Fp __f, index_sequence<_Is...>, index_sequence<_Js...>, _Ls... __ls) {
+ constexpr size_t _Mp = (1 * ... * _Ls::size());
+ (__fill_cartesian_impl(
+ __iter + _Js * _Mp, __f, index_sequence<_Is..., _Js>{}, __ls...), ...);
+}
+
+template <size_t... _Ns, class _Iter, class _Fp>
+inline _LIBCPP_INLINE_VISIBILITY
+static constexpr void __fill_cartesian(_Iter __iter, _Fp __f) {
+ __fill_cartesian_impl(
+ __iter, __f, index_sequence<>{}, make_index_sequence<_Ns>{}...);
+}
- template <size_t _Ip, class _Fp, class... _Vs>
+template <size_t _Np, size_t... _Ns>
+struct __multi {
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fdiagonal_impl() {
- return __make_dispatch<_Fp, _Vs...>(
- index_sequence<(__identity<_Vs>{}, _Ip)...>{});
- }
+ static constexpr size_t __size = (_Np * ... * _Ns);
- template <class _Fp, class... _Vs, size_t... _Is>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fdiagonal_impl(index_sequence<_Is...>) {
- return __base::__make_farray(__make_fdiagonal_impl<_Is, _Fp, _Vs...>()...);
+ static constexpr size_t
+ __index(const size_t (&__is)[sizeof...(_Ns) + 1]) noexcept {
+ constexpr size_t __ns[] = {_Ns..., 1};
+ size_t __result = 0;
+ for (size_t __i = 0; __i < sizeof...(_Ns) + 1; ++__i) {
+ if (__is[__i] == variant_npos) {
+ return variant_npos;
+ }
+ __result += __is[__i];
+ __result *= __ns[__i];
+ }
+ return __result;
}
+};
- template <class _Fp, class _Vp, class... _Vs>
+template <size_t... _Ns>
+struct __indices {
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fdiagonal() {
- constexpr size_t _Np = __uncvref_t<_Vp>::__size();
- static_assert(__all<(_Np == __uncvref_t<_Vs>::__size())...>::value);
- return __make_fdiagonal_impl<_Fp, _Vp, _Vs...>(make_index_sequence<_Np>{});
- }
+ static constexpr auto __value = [] {
+ using _Tp = array<size_t, sizeof...(_Ns)>;
+ array<_Tp, (1 * ... * _Ns)> __result = {};
+ __fill_cartesian<_Ns...>(__result.begin(),
+ [](auto... __is) -> _Tp { return {__is...}; });
+ return __result;
+ }();
+};
+
+template <size_t... _Ns, class _Fp, class _Rp, class... _Args>
+inline _LIBCPP_INLINE_VISIBILITY
+static constexpr auto __make_vtable_impl(_Fp __f, _Rp (*)(_Args...)) {
+ array<_Rp (*)(_Args...), (1 * ... * _Ns) + 1> __result = {
+ [](_Args...) -> _Rp { __throw_bad_variant_access(); }
+ };
+ __fill_cartesian<_Ns...>(__result.begin() + 1, __f);
+ return __result;
+}
- template <class _Fp, class... _Vs, size_t... _Is>
+template <size_t... _Ns, class _Fp>
+inline _LIBCPP_INLINE_VISIBILITY
+static constexpr auto __make_vtable(_Fp __f) {
+ using _Tp = decltype(__f(integral_constant<size_t, (_Ns, 0)>{}...));
+ return __make_vtable_impl<_Ns...>(__f, _Tp{});
+}
+
+struct __base {
+ template <class _Vis, class _Vp, class _Wp>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fmatrix_impl(index_sequence<_Is...> __is) {
- return __make_dispatch<_Fp, _Vs...>(__is);
+ static constexpr decltype(auto)
+ __visit_alt_at(size_t __index, _Vis&& __vis, _Vp&& __v, _Wp&& __w) {
+ constexpr size_t __size = __uncvref_t<_Vp>::__size();
+ static_assert(__size == __uncvref_t<_Wp>::__size());
+ constexpr auto __dispatch = [](auto __i) {
+ return +[](_Vis&& __vis, _Vp&& __v, _Wp&& __w) -> decltype(auto) {
+ constexpr size_t _Ip = decltype(__i)::value;
+ return __invoke_constexpr(
+ _VSTD::forward<_Vis>(__vis),
+ __access::__base::__get_alt<_Ip>(_VSTD::forward<_Vp>(__v)),
+ __access::__base::__get_alt<_Ip>(_VSTD::forward<_Wp>(__w)));
+ };
+ };
+#define _LIBCPP_VARIANT_CASE(_Ip) \
+ case _Ip: { \
+ if constexpr (_Ip < __size) { \
+ return __dispatch(integral_constant<size_t, _Ip>{})( \
+ _VSTD::forward<_Vis>(__vis), \
+ _VSTD::forward<_Vp>(__v), \
+ _VSTD::forward<_Wp>(__w)); \
+ } else { \
+ _LIBCPP_UNREACHABLE(); \
+ } \
+ }
+ if constexpr (__size <= _LIBCPP_VARIANT_SWITCH_MAX) {
+ switch (__index) {
+ _LIBCPP_VARIANT_CASES(_LIBCPP_VARIANT_SWITCH_MAX, _LIBCPP_VARIANT_CASE)
+ default: __throw_bad_variant_access();
+ }
+ } else {
+ constexpr auto __vtable = __make_vtable<__size>(__dispatch);
+ return __vtable[__index + 1](_VSTD::forward<_Vis>(__vis),
+ _VSTD::forward<_Vp>(__v),
+ _VSTD::forward<_Wp>(__w));
+ }
+#undef _LIBCPP_VARIANT_CASE
}
- template <class _Fp, class... _Vs, size_t... _Is, size_t... _Js, class... _Ls>
+ template <size_t... _Is, class _Vis, class... _Vs>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fmatrix_impl(index_sequence<_Is...>,
- index_sequence<_Js...>,
- _Ls... __ls) {
- return __base::__make_farray(__make_fmatrix_impl<_Fp, _Vs...>(
- index_sequence<_Is..., _Js>{}, __ls...)...);
+ static constexpr decltype(auto) __visit_alt(_Vis&& __vis, _Vs&&... __vs) {
+ if constexpr (sizeof...(_Vs) == 0) {
+ return __invoke_constexpr(_VSTD::forward<_Vis>(__vis));
+ } else {
+ return __visit_alt_impl(index_sequence_for<_Vs...>{},
+ _VSTD::forward<_Vis>(__vis),
+ _VSTD::forward<_Vs>(__vs)...);
+ }
}
- template <class _Fp, class... _Vs>
+ template <size_t... _Is, class _Vis, class... _Vs>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_fmatrix() {
- return __make_fmatrix_impl<_Fp, _Vs...>(
- index_sequence<>{}, make_index_sequence<__uncvref_t<_Vs>::__size()>{}...);
+ static constexpr decltype(auto)
+ __visit_alt_impl(index_sequence<_Is...>, _Vis&& __vis, _Vs&&... __vs) {
+ using __multi = __multi<__uncvref_t<_Vs>::__size()...>;
+ constexpr auto __dispatch = [](auto... __is) {
+ return +[](_Vis&& __vis, _Vs&&... __vs) {
+ return __invoke_constexpr(
+ _VSTD::forward<_Vis>(__vis),
+ __access::__base::__get_alt<decltype(__is)::value>(
+ _VSTD::forward<_Vs>(__vs))...);
+ };
+ };
+#define _LIBCPP_VARIANT_CASE(_Ip) \
+ case _Ip: { \
+ if constexpr (_Ip < __multi::__size) { \
+ return __dispatch(integral_constant<size_t, __itable[_Ip][_Is]>{}...)( \
+ _VSTD::forward<_Vis>(__vis), _VSTD::forward<_Vs>(__vs)...); \
+ } else { \
+ _LIBCPP_UNREACHABLE(); \
+ } \
+ }
+ if constexpr (__multi::__size <= _LIBCPP_VARIANT_SWITCH_MAX) {
+ constexpr const auto& __itable =
+ __indices<__uncvref_t<_Vs>::__size()...>::__value;
+ switch (__multi::__index({__vs.index()...})) {
+ _LIBCPP_VARIANT_CASES(_LIBCPP_VARIANT_SWITCH_MAX, _LIBCPP_VARIANT_CASE)
+ default: __throw_bad_variant_access();
+ }
+ } else {
+ constexpr auto __vtable =
+ __make_vtable<__uncvref_t<_Vs>::__size()...>(__dispatch);
+ return __vtable[__multi::__index({__vs.index()...}) + 1](
+ _VSTD::forward<_Vis>(__vis), _VSTD::forward<_Vs>(__vs)...);
+ }
+#undef _LIBCPP_VARIANT_CASE
}
};
struct __variant {
- template <class _Visitor, class... _Vs>
+ template <class _Vis, class _Vp, class _Wp>
inline _LIBCPP_INLINE_VISIBILITY
static constexpr decltype(auto)
- __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) {
+ __visit_alt_at(size_t __index, _Vis&& __vis, _Vp&& __v, _Wp&& __w) {
return __base::__visit_alt_at(__index,
- _VSTD::forward<_Visitor>(__visitor),
- _VSTD::forward<_Vs>(__vs).__impl...);
+ _VSTD::forward<_Vis>(__vis),
+ _VSTD::forward<_Vp>(__v).__impl,
+ _VSTD::forward<_Wp>(__w).__impl);
}
- template <class _Visitor, class... _Vs>
+ template <class _Vis, class... _Vs>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor,
- _Vs&&... __vs) {
- return __base::__visit_alt(_VSTD::forward<_Visitor>(__visitor),
+ static constexpr decltype(auto) __visit_alt(_Vis&& __vis, _Vs&&... __vs) {
+ return __base::__visit_alt(_VSTD::forward<_Vis>(__vis),
_VSTD::forward<_Vs>(__vs).__impl...);
}
- template <class _Visitor, class... _Vs>
+ template <class _Vis, class _Vp, class _Wp>
inline _LIBCPP_INLINE_VISIBILITY
static constexpr decltype(auto)
- __visit_value_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) {
- return __visit_alt_at(
- __index,
- __make_value_visitor(_VSTD::forward<_Visitor>(__visitor)),
- _VSTD::forward<_Vs>(__vs)...);
+ __visit_value_at(size_t __index, _Vis&& __vis, _Vp&& __v, _Wp&& __w) {
+ return __visit_alt_at(__index,
+ __make_value_visitor(_VSTD::forward<_Vis>(__vis)),
+ _VSTD::forward<_Vp>(__v),
+ _VSTD::forward<_Wp>(__w));
}
- template <class _Visitor, class... _Vs>
+ template <class _Vis, class... _Vs>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr decltype(auto) __visit_value(_Visitor&& __visitor,
- _Vs&&... __vs) {
- return __visit_alt(
- __make_value_visitor(_VSTD::forward<_Visitor>(__visitor)),
- _VSTD::forward<_Vs>(__vs)...);
+ static constexpr decltype(auto) __visit_value(_Vis&& __vis, _Vs&&... __vs) {
+ return __visit_alt(__make_value_visitor(_VSTD::forward<_Vis>(__vis)),
+ _VSTD::forward<_Vs>(__vs)...);
}
private:
- template <class _Visitor, class... _Values>
+ template <class _Vis, class... _Values>
+ inline _LIBCPP_INLINE_VISIBILITY
static constexpr void __std_visit_exhaustive_visitor_check() {
- static_assert(is_invocable_v<_Visitor, _Values...>,
+ static_assert(is_invocable_v<_Vis, _Values...>,
"`std::visit` requires the visitor to be exhaustive.");
}
- template <class _Visitor>
+ template <class _Vis>
struct __value_visitor {
template <class... _Alts>
inline _LIBCPP_INLINE_VISIBILITY
constexpr decltype(auto) operator()(_Alts&&... __alts) const {
__std_visit_exhaustive_visitor_check<
- _Visitor,
- decltype((_VSTD::forward<_Alts>(__alts).__value))...>();
- return __invoke_constexpr(_VSTD::forward<_Visitor>(__visitor),
+ _Vis, decltype((_VSTD::forward<_Alts>(__alts).__value))...>();
+ return __invoke_constexpr(_VSTD::forward<_Vis>(__vis),
_VSTD::forward<_Alts>(__alts).__value...);
}
- _Visitor&& __visitor;
+ _Vis&& __vis;
};
- template <class _Visitor>
+ template <class _Vis>
inline _LIBCPP_INLINE_VISIBILITY
- static constexpr auto __make_value_visitor(_Visitor&& __visitor) {
- return __value_visitor<_Visitor>{_VSTD::forward<_Visitor>(__visitor)};
+ static constexpr auto __make_value_visitor(_Vis&& __vis) {
+ return __value_visitor<_Vis>{_VSTD::forward<_Vis>(__vis)};
}
};
+#undef _LIBCPP_VARIANT_SWITCH_MAX
+#undef _LIBCPP_VARIANT_CASES
+#undef _LIBCPP_VARIANT_CASES_256
+#undef _LIBCPP_VARIANT_CASES_64
+#undef _LIBCPP_VARIANT_CASES_16
+#undef _LIBCPP_VARIANT_CASES_4
+
} // namespace __visitation
template <size_t _Index, class _Tp>
#define _LIBCPP_VARIANT_UNION(destructible_trait, destructor) \
template <size_t _Index, class _Tp, class... _Types> \
- union _LIBCPP_TEMPLATE_VIS __union<destructible_trait, \
+ union _LIBCPP_TEMPLATE_VIS __union<destructible_trait, \
_Index, \
_Tp, \
_Types...> { \
template <size_t _Ip, class _Tp, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
static _Tp& __construct_alt(__alt<_Ip, _Tp>& __a, _Args&&... __args) {
- ::new ((void*)_VSTD::addressof(__a))
+ auto* result = ::new ((void*)_VSTD::addressof(__a))
__alt<_Ip, _Tp>(in_place, _VSTD::forward<_Args>(__args)...);
- return __a.__value;
+ return result->__value;
}
template <class _Rhs>
#define _LIBCPP_VARIANT_MOVE_CONSTRUCTOR(move_constructible_trait, \
move_constructor) \
template <class... _Types> \
- class _LIBCPP_TEMPLATE_VIS __move_constructor<__traits<_Types...>, \
+ class _LIBCPP_TEMPLATE_VIS __move_constructor<__traits<_Types...>, \
move_constructible_trait> \
: public __constructor<__traits<_Types...>> { \
using __base_type = __constructor<__traits<_Types...>>; \
#define _LIBCPP_VARIANT_COPY_CONSTRUCTOR(copy_constructible_trait, \
copy_constructor) \
template <class... _Types> \
- class _LIBCPP_TEMPLATE_VIS __copy_constructor<__traits<_Types...>, \
+ class _LIBCPP_TEMPLATE_VIS __copy_constructor<__traits<_Types...>, \
copy_constructible_trait> \
: public __move_constructor<__traits<_Types...>> { \
using __base_type = __move_constructor<__traits<_Types...>>; \
auto& __emplace(_Args&&... __args) {
this->__destroy();
auto& __res = this->__construct_alt(__access::__base::__get_alt<_Ip>(*this),
- _VSTD::forward<_Args>(__args)...);
+ _VSTD::forward<_Args>(__args)...);
this->__index = _Ip;
return __res;
}
#define _LIBCPP_VARIANT_MOVE_ASSIGNMENT(move_assignable_trait, \
move_assignment) \
template <class... _Types> \
- class _LIBCPP_TEMPLATE_VIS __move_assignment<__traits<_Types...>, \
+ class _LIBCPP_TEMPLATE_VIS __move_assignment<__traits<_Types...>, \
move_assignable_trait> \
: public __assignment<__traits<_Types...>> { \
using __base_type = __assignment<__traits<_Types...>>; \
#define _LIBCPP_VARIANT_COPY_ASSIGNMENT(copy_assignable_trait, \
copy_assignment) \
template <class... _Types> \
- class _LIBCPP_TEMPLATE_VIS __copy_assignment<__traits<_Types...>, \
+ class _LIBCPP_TEMPLATE_VIS __copy_assignment<__traits<_Types...>, \
copy_assignable_trait> \
: public __move_assignment<__traits<_Types...>> { \
using __base_type = __move_assignment<__traits<_Types...>>; \
__lhs.index(), __convert_to_bool<greater_equal<>>{}, __lhs, __rhs);
}
-template <class _Visitor, class... _Vs>
+template <class _Vis, class... _Vs>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
-constexpr decltype(auto) visit(_Visitor&& __visitor, _Vs&&... __vs) {
+constexpr decltype(auto) visit(_Vis&& __vis, _Vs&&... __vs) {
using __variant_detail::__visitation::__variant;
- bool __results[] = {__vs.valueless_by_exception()...};
- for (bool __result : __results) {
- if (__result) {
- __throw_bad_variant_access();
- }
- }
- return __variant::__visit_value(_VSTD::forward<_Visitor>(__visitor),
+ return __variant::__visit_value(_VSTD::forward<_Vis>(__vis),
_VSTD::forward<_Vs>(__vs)...);
}
std::visit(std::move(cobj), v, v2);
assert((Fn::check_call<long &, std::string &>(CT_Const | CT_RValue)));
}
+ {
+ using V = std::variant<int, long, double, std::string>;
+ V v1(42l), v2("hello"), v3(101), v4(1.1);
+ std::visit(obj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int &, double &>(CT_NonConst | CT_LValue)));
+ std::visit(cobj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int &, double &>(CT_Const | CT_LValue)));
+ std::visit(std::move(obj), v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int &, double &>(CT_NonConst | CT_RValue)));
+ std::visit(std::move(cobj), v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int &, double &>(CT_Const | CT_RValue)));
+ }
+ {
+ using V = std::variant<int, long, double, int*, std::string>;
+ V v1(42l), v2("hello"), v3(nullptr), v4(1.1);
+ std::visit(obj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_NonConst | CT_LValue)));
+ std::visit(cobj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_Const | CT_LValue)));
+ std::visit(std::move(obj), v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_NonConst | CT_RValue)));
+ std::visit(std::move(cobj), v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_Const | CT_RValue)));
+ }
}
void test_argument_forwarding() {
std::visit(obj, std::move(cv));
assert(Fn::check_call<int &&>(Val));
}
+#endif
{ // multi argument - multi variant
- using S = const std::string &;
- using V = std::variant<int, S, long &&>;
- const std::string str = "hello";
- long l = 43;
- V v1(42);
- const V &cv1 = v1;
- V v2(str);
- const V &cv2 = v2;
- V v3(std::move(l));
- const V &cv3 = v3;
+ using V = std::variant<int, std::string, long>;
+ V v1(42), v2("hello"), v3(43l);
std::visit(obj, v1, v2, v3);
- assert((Fn::check_call<int &, S, long &>(Val)));
- std::visit(obj, cv1, cv2, std::move(v3));
- assert((Fn::check_call<const int &, S, long &&>(Val)));
+ assert((Fn::check_call<int &, std::string &, long &>(Val)));
+ std::visit(obj, std::as_const(v1), std::as_const(v2), std::move(v3));
+ assert((Fn::check_call<const int &, const std::string &, long &&>(Val)));
+ }
+ {
+ using V = std::variant<int, long, double, std::string>;
+ V v1(42l), v2("hello"), v3(101), v4(1.1);
+ std::visit(obj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int &, double &>(Val)));
+ std::visit(obj, std::as_const(v1), std::as_const(v2), std::move(v3), std::move(v4));
+ assert((Fn::check_call<const long &, const std::string &, int &&, double &&>(Val)));
+ }
+ {
+ using V = std::variant<int, long, double, int*, std::string>;
+ V v1(42l), v2("hello"), v3(nullptr), v4(1.1);
+ std::visit(obj, v1, v2, v3, v4);
+ assert((Fn::check_call<long &, std::string &, int *&, double &>(Val)));
+ std::visit(obj, std::as_const(v1), std::as_const(v2), std::move(v3), std::move(v4));
+ assert((Fn::check_call<const long &, const std::string &, int *&&, double &&>(Val)));
}
-#endif
}
struct ReturnFirst {
constexpr V3 v3;
static_assert(std::visit(aobj, v1, v2, v3) == 3, "");
}
+ {
+ using V = std::variant<int, long, double, int *>;
+ constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
+ static_assert(std::visit(aobj, v1, v2, v3, v4) == 4, "");
+ }
+ {
+ using V = std::variant<int, long, double, long long, int *>;
+ constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
+ static_assert(std::visit(aobj, v1, v2, v3, v4) == 4, "");
+ }
}
void test_exceptions() {
makeEmpty(v2);
assert(test(v, v2));
}
+ {
+ using V = std::variant<int, long, double, MakeEmptyT>;
+ V v1(42l), v2(101), v3(202), v4(1.1);
+ makeEmpty(v1);
+ assert(test(v1, v2, v3, v4));
+ }
+ {
+ using V = std::variant<int, long, double, long long, MakeEmptyT>;
+ V v1(42l), v2(101), v3(202), v4(1.1);
+ makeEmpty(v1);
+ makeEmpty(v2);
+ makeEmpty(v3);
+ makeEmpty(v4);
+ assert(test(v1, v2, v3, v4));
+ }
#endif
}