fa755d3e71
Compute and propagate conversion kind to diagnostics helper in C++ to provide more specific diagnostics about incorrect implicit conversions in assignments, initializations, params, etc... Duplicated some diagnostics as errors because C++ is more strict. Tags: #clang Differential Revision: https://reviews.llvm.org/D74116
44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
// RUN: %clang_cc1 -std=c++1z -verify %s -triple x86_64-unknown-unknown
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struct S;
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typedef void Nothrow() noexcept;
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typedef void Throw();
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Nothrow *a;
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Throw *b;
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Nothrow S::*c;
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Throw S::*d;
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void test() {
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a = b; // expected-error {{incompatible function pointer types assigning to 'Nothrow *' (aka 'void (*)() noexcept') from 'Throw *' (aka 'void (*)()')}}
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b = a;
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c = d; // expected-error {{assigning to 'Nothrow S::*' from incompatible type 'Throw S::*': different exception specifications}}
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d = c;
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// Function pointer conversions do not combine properly with qualification conversions.
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// FIXME: This seems like a defect.
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Nothrow *const *pa = b; // expected-error {{cannot initialize}}
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Throw *const *pb = a; // expected-error {{cannot initialize}}
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Nothrow *const S::*pc = d; // expected-error {{cannot initialize}}
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Throw *const S::*pd = c; // expected-error {{cannot initialize}}
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}
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// ... The result is a pointer to the function.
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void f() noexcept;
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constexpr void (*p)() = &f;
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static_assert(f == p);
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struct S { void f() noexcept; };
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constexpr void (S::*q)() = &S::f;
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static_assert(q == &S::f);
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namespace std_example {
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void (*p)();
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void (**pp)() noexcept = &p; // expected-error {{cannot initialize a variable of type 'void (**)() noexcept' with an rvalue of type 'void (**)()'}}
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struct S { typedef void (*p)(); operator p(); }; // expected-note {{candidate}}
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void (*q)() noexcept = S(); // expected-error {{no viable conversion from 'std_example::S' to 'void (*)() noexcept'}}
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}
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