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// RUN: %clang_cc1 -std=c++20 -Wno-unused-value -fsyntax-only -verify %s
namespace GH49266 {
struct X {
X() = default;
X(X const&) = delete; // expected-note {{'X' has been explicitly marked deleted here}}
};
void take_by_copy(auto &...args) {
[...args = args] {}(); // expected-error {{call to deleted constructor}}
}
void take_by_ref(auto &...args) {
[&...args = args] {}(); // args is passed by reference and not copied.
}
void foo() {
X x;
take_by_copy(x); // expected-note {{in instantiation of function template specialization}}
take_by_ref(x);
}
}
namespace GH48937 {
template <typename... Ts>
consteval int f(Ts... ts) {
return ([]<Ts a = 42>(){ return a;}, ...)();
}
static_assert(f(0, 42) == 42);
template <typename Ts>
int g(Ts ts) {
return ([]<Ts a = 42>(){ return a;}, ...)(); // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
}
template <typename... Ts>
int h(Ts... ts) {
return ([]<Ts a = 42>(){ return a;})(); // expected-error {{expression contains unexpanded parameter pack 'Ts'}}
}
}
namespace GH63677 {
template<typename>
void f() {
[]<typename... Ts>() -> void {
[...us = Ts{}]{
(Ts(us), ...);
};
}.template operator()<int, int>();
}
template void f<int>();
template <class>
inline constexpr auto fun =
[]<class... Ts>(Ts... ts) {
return [... us = (Ts&&) ts]<class Fun>(Fun&& fn) mutable {
return static_cast<Fun&&>(fn)(static_cast<Ts&&>(us)...);
};
};
void f() {
[[maybe_unused]] auto s = fun<int>(1, 2, 3, 4);
}
}
namespace GH61460 {
template<typename... Ts>
void f1(Ts... ts);
template <typename... Ts> void g(Ts... p1s) {
(void)[&](auto... p2s) {
(
[&] {
p1s;
f1(p1s);
sizeof(p1s);
p2s;
},
...);
};
}
template <typename... Ts> void g2(Ts... p1s) {
(void)[&](auto... p2s) { [&] { p1s; p2s; }; }; // expected-error {{unexpanded parameter pack 'p2s'}}
}
void f1() { g(); }
} // namespace GH61460
namespace GH112352 {
template <class>
constexpr bool foo = false;
template <int>
constexpr bool bar = false;
template <template<class> class>
constexpr bool baz = false;
struct S {
template <typename... Types, int... Values> void foldExpr1() {
(void)[]<int... Is> {
([] {
Is;
// Propagate up the flag ContainsUnexpandedParameterPack from VarDecl.
S var(foo<Types>);
foo<Types>;
bar<Values>;
int a = Values;
} &&
...);
};
}
template <template<class> class... TTPs> void foldExpr2() {
(void)[]<int... Is> {
([] {
Is;
baz<TTPs>;
TTPs<int> D;
} && ...);
};
}
};
void use() {
S().foldExpr1();
S().foldExpr2();
}
} // namespace GH112352
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