85 lines
3.6 KiB
C++
85 lines
3.6 KiB
C++
// RUN: %clang_cc1 -std=c++1y %s -verify
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// For every init-capture a non-static data member named by the identifier of
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// the init-capture is declared in the closure type.
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const char *has_member_x = [x("hello")] {}.x;
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// This member is not a bit-field...
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auto capturing_lambda = [n(0)] {};
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int decltype(capturing_lambda)::*mem_ptr = &decltype(capturing_lambda)::n;
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// ... and not mutable.
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const auto capturing_lambda_copy = capturing_lambda;
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int &n = capturing_lambda_copy.n; // expected-error {{drops qualifiers}}
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// The type of that member [...is that of a...] variable declaration of the form
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// "auto init-capture ;"...
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auto with_float = [f(1.0f)] {};
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float &f = with_float.f;
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// ... except that the variable name is replaced by a unique identifier.
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auto with_float_2 = [&f(f)] {}; // ok, refers to outer f
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float &f2 = with_float_2.f;
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// Within the lambda-expression's lambda-declarator (FIXME) and
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// compound-statement, the identifier in the init-capture hides any declaration
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// of the same name in scopes enclosing the lambda-expression.
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void hiding() {
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char c;
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(void) [c("foo")] {
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static_assert(sizeof(c) == sizeof(const char*), "");
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};
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(void) [c("bar")] () -> decltype(c) {
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// FIXME: the 'c' in the return type should be the init-capture, not the
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// outer c.
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return "baz"; // expected-error {{cannot initialize}}
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};
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}
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struct ExplicitCopy {
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ExplicitCopy(); // expected-note 2{{not viable}}
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explicit ExplicitCopy(const ExplicitCopy&);
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};
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auto init_kind_1 = [ec(ExplicitCopy())] {};
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auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}}
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template<typename T> void init_kind_template() {
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auto init_kind_1 = [ec(T())] {};
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auto init_kind_2 = [ec = T()] {}; // expected-error {{no matching constructor}}
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}
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template void init_kind_template<int>();
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template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}}
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void void_fn();
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int overload_fn();
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int overload_fn(int);
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auto bad_init_1 = [a()] {}; // expected-error {{expected expression}}
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auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}}
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auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}}
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auto bad_init_4 = [a(void_fn())] {}; // expected-error {{field has incomplete type 'void'}}
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auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}}
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auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}}
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template<typename...T> void pack_1(T...t) { [a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}}
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template void pack_1<>(); // expected-note {{instantiation of}}
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auto multi_return(int a, int b) {
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return [n(a + 2*b), m(a - 2*b)] {};
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}
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auto use_multi_return() {
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auto nm = multi_return(5, 9);
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return nm.n + nm.m;
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}
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auto a = [a(4), b = 5, &c = static_cast<const int&&>(0)] { // expected-warning {{binding reference member 'c' to a temporary value}} expected-note {{here}}
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static_assert(sizeof(a) == sizeof(int), "");
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static_assert(sizeof(b) == sizeof(int), "");
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using T = decltype(c);
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using T = const int &;
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};
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auto b = [a{0}] {}; // expected-error {{include <initializer_list>}}
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struct S { S(); S(S&&); };
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template<typename T> struct remove_reference { typedef T type; };
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template<typename T> struct remove_reference<T&> { typedef T type; };
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template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); }
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auto s = [s(move(S()))] {};
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