forked from OSchip/llvm-project
103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
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// New exciting ambiguities in C++11
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// final 'context sensitive' mess.
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namespace final {
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struct S { int n; };
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struct T { int n; };
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namespace N {
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int n;
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// These declare variables named final..
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extern struct S final;
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extern struct S final [[]];
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extern struct S final, foo;
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struct S final = S();
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// This defines a class, not a variable, even though it would successfully
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// parse as a variable but not as a class. DR1318's wording suggests that
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// this disambiguation is only performed on an ambiguity, but that was not
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// the intent.
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struct S final { // expected-note {{here}}
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int(n) // expected-error {{expected ';'}}
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};
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// This too.
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struct T final : S {}; // expected-error {{base 'S' is marked 'final'}}
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struct T bar : S {}; // expected-error {{expected ';' after top level declarator}} expected-error {{expected unqualified-id}}
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}
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}
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// enum versus bitfield mess.
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namespace bitfield {
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enum E {};
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struct T {
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constexpr T() {}
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constexpr T(int) {}
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constexpr T(T, T, T, T) {}
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constexpr T operator=(T) { return *this; }
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constexpr operator int() { return 4; }
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};
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constexpr T a, b, c, d;
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struct S1 {
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enum E : T ( a = 1, b = 2, c = 3, 4 ); // ok, declares a bitfield
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};
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// This could be a bit-field.
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struct S2 {
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enum E : T { a = 1, b = 2, c = 3, 4 }; // expected-error {{non-integral type}} expected-error {{expected '}'}} expected-note {{to match}}
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};
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struct S3 {
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enum E : int { a = 1, b = 2, c = 3, d }; // ok, defines an enum
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};
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// Ambiguous.
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struct S4 {
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enum E : int { a = 1 }; // ok, defines an enum
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};
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// This could be a bit-field, but would be ill-formed due to the anonymous
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// member being initialized.
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struct S5 {
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enum E : int { a = 1 } { b = 2 }; // expected-error {{expected member name}}
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};
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// This could be a bit-field.
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struct S6 {
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enum E : int { 1 }; // expected-error {{expected '}'}} expected-note {{to match}}
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};
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struct U {
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constexpr operator T() { return T(); } // expected-note 2{{candidate}}
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};
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// This could be a bit-field.
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struct S7 {
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enum E : int { a = U() }; // expected-error {{no viable conversion}}
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};
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// This could be a bit-field, and does not conform to the grammar of an
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// enum definition, because 'id(U())' is not a constant-expression.
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constexpr const U &id(const U &u) { return u; }
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struct S8 {
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enum E : int { a = id(U()) }; // expected-error {{no viable conversion}}
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};
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}
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namespace trailing_return {
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typedef int n;
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int a;
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struct S {
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S(int);
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S *operator()() const;
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int n;
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};
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namespace N {
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void f() {
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// This parses as a function declaration, but DR1223 makes the presence of
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// 'auto' be used for disambiguation.
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S(a)()->n; // ok, expression; expected-warning{{expression result unused}}
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auto(a)()->n; // ok, function declaration
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using T = decltype(a);
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using T = auto() -> n;
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}
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}
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}
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