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// RUN: %clang_cc1 -fsyntax-only -Wunused-lambda-capture -Wused-but-marked-unused -Wno-uninitialized -verify -std=c++1z %s
class NonTrivialConstructor {
public:
NonTrivialConstructor() {}
};
class NonTrivialCopyConstructor {
public:
NonTrivialCopyConstructor() = default;
NonTrivialCopyConstructor(const NonTrivialCopyConstructor &) {}
};
class NonTrivialDestructor {
public:
~NonTrivialDestructor() {}
};
class Trivial {
public:
Trivial() = default;
Trivial(int a) {}
};
int side_effect() {
return 42;
}
void test() {
int i = 0;
const int k = 0;
auto captures_nothing = [] {};
auto captures_nothing_by_value = [=] {};
auto captures_nothing_by_reference = [&] {};
auto implicit_by_value = [=]() mutable { i++; };
auto implicit_by_reference = [&] { i++; };
auto explicit_by_value_used = [i] { return i + 1; };
auto explicit_by_value_used_void = [i] { (void)i; };
auto explicit_by_value_unused = [i] {}; // expected-warning{{lambda capture 'i' is not used}}
auto explicit_by_value_unused_sizeof = [i] { return sizeof(i); }; // expected-warning{{lambda capture 'i' is not required to be captured for this use}}
auto explicit_by_value_unused_decltype = [i] { decltype(i) j = 0; }; // expected-warning{{lambda capture 'i' is not required to be captured for this use}}
auto explicit_by_value_unused_const = [k] { return k + 1; }; // expected-warning{{lambda capture 'k' is not required to be captured for this use}}
auto explicit_by_reference_used = [&i] { i++; };
auto explicit_by_reference_unused = [&i] {}; // expected-warning{{lambda capture 'i' is not used}}
auto explicit_initialized_reference_used = [&j = i] { return j + 1; };
auto explicit_initialized_reference_unused = [&j = i]{}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_used = [j = 1] { return j + 1; };
auto explicit_initialized_value_unused = [j = 1] {}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_non_trivial_constructor = [j = NonTrivialConstructor()]{};
auto explicit_initialized_value_non_trivial_destructor = [j = NonTrivialDestructor()]{};
auto explicit_initialized_value_trivial_init = [j = Trivial()]{}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_non_trivial_init = [j = Trivial(42)]{};
auto explicit_initialized_value_with_side_effect = [j = side_effect()]{};
auto nested = [&i] {
auto explicit_by_value_used = [i] { return i + 1; };
auto explicit_by_value_unused = [i] {}; // expected-warning{{lambda capture 'i' is not used}}
};
Trivial trivial;
auto explicit_by_value_trivial = [trivial] {}; // expected-warning{{lambda capture 'trivial' is not used}}
NonTrivialConstructor cons;
auto explicit_by_value_non_trivial_constructor = [cons] {}; // expected-warning{{lambda capture 'cons' is not used}}
NonTrivialCopyConstructor copy_cons;
auto explicit_by_value_non_trivial_copy_constructor = [copy_cons] {};
NonTrivialDestructor dest;
auto explicit_by_value_non_trivial_destructor = [dest] {};
volatile int v;
auto explicit_by_value_volatile = [v] {};
}
class TrivialThis : Trivial {
void test() {
auto explicit_this_used = [this] { return i; };
auto explicit_this_used_void = [this] { (void)this; };
auto explicit_this_unused = [this] {}; // expected-warning{{lambda capture 'this' is not used}}
auto explicit_star_this_used = [*this] { return i; };
auto explicit_star_this_used_void = [*this] { (void)this; };
auto explicit_star_this_unused = [*this] {}; // expected-warning{{lambda capture 'this' is not used}}
}
int i;
};
class NonTrivialConstructorThis : NonTrivialConstructor {
void test() {
auto explicit_this_used = [this] { return i; };
auto explicit_this_used_void = [this] { (void)this; };
auto explicit_this_unused = [this] {}; // expected-warning{{lambda capture 'this' is not used}}
auto explicit_star_this_used = [*this] { return i; };
auto explicit_star_this_used_void = [*this] { (void)this; };
auto explicit_star_this_unused = [*this] {}; // expected-warning{{lambda capture 'this' is not used}}
}
int i;
};
class NonTrivialCopyConstructorThis : NonTrivialCopyConstructor {
void test() {
auto explicit_this_used = [this] { return i; };
auto explicit_this_used_void = [this] { (void)this; };
auto explicit_this_unused = [this] {}; // expected-warning{{lambda capture 'this' is not used}}
auto explicit_star_this_used = [*this] { return i; };
auto explicit_star_this_used_void = [*this] { (void)this; };
auto explicit_star_this_unused = [*this] {};
}
int i;
};
class NonTrivialDestructorThis : NonTrivialDestructor {
void test() {
auto explicit_this_used = [this] { return i; };
auto explicit_this_used_void = [this] { (void)this; };
auto explicit_this_unused = [this] {}; // expected-warning{{lambda capture 'this' is not used}}
auto explicit_star_this_used = [*this] { return i; };
auto explicit_star_this_used_void = [*this] { (void)this; };
auto explicit_star_this_unused = [*this] {};
}
int i;
};
template <typename T>
void test_templated() {
int i = 0;
const int k = 0;
auto captures_nothing = [] {};
auto captures_nothing_by_value = [=] {};
auto captures_nothing_by_reference = [&] {};
auto implicit_by_value = [=]() mutable { i++; };
auto implicit_by_reference = [&] { i++; };
auto explicit_by_value_used = [i] { return i + 1; };
auto explicit_by_value_used_generic = [i](auto c) { return i + 1; };
auto explicit_by_value_used_void = [i] { (void)i; };
auto explicit_by_value_unused = [i] {}; // expected-warning{{lambda capture 'i' is not used}}
auto explicit_by_value_unused_sizeof = [i] { return sizeof(i); }; // expected-warning{{lambda capture 'i' is not required to be captured for this use}}
auto explicit_by_value_unused_decltype = [i] { decltype(i) j = 0; }; // expected-warning{{lambda capture 'i' is not used}}
auto explicit_by_value_unused_const = [k] { return k + 1; }; // expected-warning{{lambda capture 'k' is not required to be captured for this use}}
auto explicit_by_value_unused_const_generic = [k](auto c) { return k + 1; }; // expected-warning{{lambda capture 'k' is not required to be captured for this use}}
auto explicit_by_reference_used = [&i] { i++; };
auto explicit_by_reference_unused = [&i] {}; // expected-warning{{lambda capture 'i' is not used}}
auto explicit_initialized_reference_used = [&j = i] { return j + 1; };
auto explicit_initialized_reference_unused = [&j = i]{}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_used = [j = 1] { return j + 1; };
auto explicit_initialized_value_unused = [j = 1] {}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_non_trivial_constructor = [j = NonTrivialConstructor()]{};
auto explicit_initialized_value_non_trivial_destructor = [j = NonTrivialDestructor()]{};
auto explicit_initialized_value_trivial_init = [j = Trivial()]{}; // expected-warning{{lambda capture 'j' is not used}}
auto explicit_initialized_value_non_trivial_init = [j = Trivial(42)]{};
auto explicit_initialized_value_with_side_effect = [j = side_effect()]{};
auto explicit_initialized_value_generic_used = [i = 1](auto c) mutable { i++; };
auto explicit_initialized_value_generic_unused = [i = 1](auto c) mutable {}; // expected-warning{{lambda capture 'i' is not used}}
auto nested = [&i] {
auto explicit_by_value_used = [i] { return i + 1; };
auto explicit_by_value_unused = [i] {}; // expected-warning{{lambda capture 'i' is not used}}
};
Trivial trivial;
auto explicit_by_value_trivial = [trivial] {}; // expected-warning{{lambda capture 'trivial' is not used}}
NonTrivialConstructor cons;
auto explicit_by_value_non_trivial_constructor = [cons] {}; // expected-warning{{lambda capture 'cons' is not used}}
NonTrivialCopyConstructor copy_cons;
auto explicit_by_value_non_trivial_copy_constructor = [copy_cons] {};
NonTrivialDestructor dest;
auto explicit_by_value_non_trivial_destructor = [dest] {};
volatile int v;
auto explicit_by_value_volatile = [v] {};
}
void test_use_template() {
test_templated<int>(); // expected-note{{in instantiation of function template specialization 'test_templated<int>' requested here}}
}
namespace pr35555 {
int a;
void b() {
int c[a];
auto vla_used = [&c] { return c[0]; };
auto vla_unused = [&c] {}; // expected-warning{{lambda capture 'c' is not used}}
}
} // namespace pr35555
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