54 lines
2.4 KiB
C++
54 lines
2.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx23 -std=c++23 -Wpre-c++23-compat %s
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// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx20 -std=c++20 %s
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void looks_like_decltype_auto() {
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decltype(auto(42)) b = 42; // cxx20-error {{'auto' not allowed here}} \
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cxx23-warning {{'auto' as a functional-style cast is incompatible with C++ standards before C++23}}
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decltype(long *) a = 42; // expected-error {{expected '(' for function-style cast or type construction}} \
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expected-error {{expected expression}}
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decltype(auto *) a = 42; // expected-error {{expected '(' for function-style cast or type construction}} \
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expected-error {{expected expression}}
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decltype(auto()) c = 42; // cxx23-error {{initializer for functional-style cast to 'auto' is empty}} \
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cxx20-error {{'auto' not allowed here}}
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}
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struct looks_like_declaration {
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int n;
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} a;
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using T = looks_like_declaration *;
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void f() { T(&a)->n = 1; }
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void g() { auto(&a)->n = 0; } // cxx23-warning {{before C++23}} \
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// cxx20-error {{declaration of variable 'a' with deduced type 'auto (&)' requires an initializer}} \
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// cxx20-error {{expected ';' at end of declaration}}
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void h() { auto{&a}->n = 0; } // cxx23-warning {{before C++23}} \
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// cxx20-error {{expected unqualified-id}} \
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// cxx20-error {{expected expression}}
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void e(auto (*p)(int y) -> decltype(y)) {}
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struct M;
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struct S{
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S operator()();
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S* operator->();
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int N;
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int M;
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} s; // expected-note {{here}}
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void test() {
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auto(s)()->N; // cxx23-warning {{expression result unused}} \
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// cxx23-warning {{before C++23}} \
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// cxx20-error {{unknown type name 'N'}}
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auto(s)()->M; // expected-error {{redefinition of 's' as different kind of symbol}}
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}
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void test_paren() {
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int a = (auto(0)); // cxx23-warning {{before C++23}} \
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// cxx20-error {{expected expression}} \
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// cxx20-error {{expected ')'}} \
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// cxx20-note {{to match this '('}}
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int b = (auto{0}); // cxx23-warning {{before C++23}} \
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// cxx20-error {{expected expression}} \
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// cxx20-error {{expected ')'}} \
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// cxx20-note {{to match this '('}}
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}
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