81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
|
// RUN: %clang_cc1 -std=c++1y %s -verify
|
||
|
|
|
||
|
|
const char *has_no_member = [x("hello")] {}.x; // expected-error {{no member named 'x'}}
|
||
|
|
|
||
|
|
double f;
|
||
|
|
auto with_float = [f(1.0f)] {
|
||
|
|
using T = decltype(f);
|
||
|
|
using T = float;
|
||
|
|
};
|
||
|
|
auto with_float_2 = [&f(f)] { // ok, refers to outer f
|
||
|
|
using T = decltype(f);
|
||
|
|
using T = double&;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Within the lambda-expression's compound-statement,
|
||
|
|
// the identifier in the init-capture hides any declaration
|
||
|
|
// of the same name in scopes enclosing the lambda-expression.
|
||
|
|
void hiding() {
|
||
|
|
char c;
|
||
|
|
(void) [c("foo")] {
|
||
|
|
static_assert(sizeof(c) == sizeof(const char*), "");
|
||
|
|
};
|
||
|
|
(void) [c("bar")] () -> decltype(c) { // outer c, not init-capture
|
||
|
|
return "baz"; // expected-error {{cannot initialize}}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
struct ExplicitCopy {
|
||
|
|
ExplicitCopy(); // expected-note 2{{not viable}}
|
||
|
|
explicit ExplicitCopy(const ExplicitCopy&); // expected-note 2{{not a candidate}}
|
||
|
|
};
|
||
|
|
auto init_kind_1 = [ec(ExplicitCopy())] {};
|
||
|
|
auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}}
|
||
|
|
|
||
|
|
template<typename T> void init_kind_template() {
|
||
|
|
auto init_kind_1 = [ec(T())] {};
|
||
|
|
auto init_kind_2 = [ec = T()] {}; // expected-error {{no matching constructor}}
|
||
|
|
}
|
||
|
|
template void init_kind_template<int>();
|
||
|
|
template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}}
|
||
|
|
|
||
|
|
void void_fn();
|
||
|
|
int overload_fn();
|
||
|
|
int overload_fn(int);
|
||
|
|
|
||
|
|
auto bad_init_1 = [a()] {}; // expected-error {{expected expression}}
|
||
|
|
auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}}
|
||
|
|
auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}}
|
||
|
|
auto bad_init_4 = [a(void_fn())] {}; // expected-error {{has incomplete type 'void'}}
|
||
|
|
auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}}
|
||
|
|
auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}}
|
||
|
|
auto bad_init_7 = [a{{1}}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from nested initializer list}}
|
||
|
|
|
||
|
|
template<typename...T> void pack_1(T...t) { (void)[a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}}
|
||
|
|
template void pack_1<>(); // expected-note {{instantiation of}}
|
||
|
|
|
||
|
|
// No lifetime-extension of the temporary here.
|
||
|
|
auto a_copy = [&c = static_cast<const int&&>(0)] {}; // expected-warning {{temporary whose address is used as value of local variable 'a_copy' will be destroyed at the end of the full-expression}} expected-note {{via initialization of lambda capture 'c'}}
|
||
|
|
|
||
|
|
// But there is lifetime extension here.
|
||
|
|
auto &&a = [a(4), b = 5, &c = static_cast<const int&&>(0)] {
|
||
|
|
static_assert(sizeof(a) == sizeof(int), "");
|
||
|
|
static_assert(sizeof(b) == sizeof(int), "");
|
||
|
|
using T = decltype(c);
|
||
|
|
using T = const int &;
|
||
|
|
};
|
||
|
|
auto b = [a{0}] {}; // OK, per N3922
|
||
|
|
|
||
|
|
struct S { S(); S(S&&); };
|
||
|
|
template<typename T> struct remove_reference { typedef T type; };
|
||
|
|
template<typename T> struct remove_reference<T&> { typedef T type; };
|
||
|
|
template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); }
|
||
|
|
auto s = [s(move(S()))] {};
|
||
|
|
|
||
|
|
template<typename T> T instantiate_test(T t) {
|
||
|
|
[x(&t)]() { *x = 1; } (); // expected-error {{assigning to 'const char *'}}
|
||
|
|
return t;
|
||
|
|
}
|
||
|
|
int instantiate_test_1 = instantiate_test(0);
|
||
|
|
const char *instantiate_test_2 = instantiate_test("foo"); // expected-note {{here}}
|