27a972a699
(This relands 59337263ab and makes sure comma operator
diagnostics are suppressed in a SFINAE context.)
While at it, add the diagnosis message "left operand of comma operator has no effect" (used by GCC) for comma operator.
This also makes Clang diagnose in the constant evaluation context which aligns with GCC/MSVC behavior. (https://godbolt.org/z/7zxb8Tx96)
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D103938
132 lines
2.9 KiB
C++
132 lines
2.9 KiB
C++
// RUN: %clang_cc1 -std=c++2a -include %s %s -ast-print -verify | FileCheck %s
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//
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// RUN: %clang_cc1 -std=c++2a -emit-pch %s -o %t-cxx2a
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// RUN: %clang_cc1 -std=c++2a -include-pch %t-cxx2a %s -ast-print -verify | FileCheck %s
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// RUN: %clang_cc1 -std=c++2a -emit-pch -fpch-instantiate-templates %s -o %t-cxx2a
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// RUN: %clang_cc1 -std=c++2a -include-pch %t-cxx2a %s -ast-print -verify | FileCheck %s
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#ifndef USE_PCH
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namespace inheriting_constructor {
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struct S {};
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template<typename X, typename Y> struct T {
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template<typename A>
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explicit(((void)Y{}, true)) T(A &&a) {}
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};
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template<typename X, typename Y> struct U : T<X, Y> {
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using T<X, Y>::T;
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};
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U<S, char> foo(char ch) {
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return U<S, char>(ch);
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}
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}
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#else
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namespace inheriting_constructor {
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U<S, char> a = foo('0');
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}
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//CHECK: explicit(((void)char{} , true))
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#endif
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namespace basic {
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#ifndef USE_PCH
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struct B {};
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struct A {
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explicit A(int);
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explicit(false) operator bool();
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explicit(true) operator B();
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};
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#else
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//expected-note@-6+ {{candidate constructor}}
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//expected-note@-9+ {{candidate constructor}}
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//expected-note-re@-7+ {{explicit constructor is not a candidate{{$}}}}
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//expected-note@-7+ {{candidate function}}
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//expected-note@-7+ {{explicit conversion function is not a candidate (explicit specifier evaluates to true)}}
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//CHECK: explicit{{ +}}A(
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//CHECK-NEXT: explicit(false){{ +}}operator
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//CHECK-NEXT: explicit(true){{ +}}operator
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A a = 0; //expected-error {{no viable conversion}}
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A a1(0);
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bool b = a1;
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B b1 = a1; //expected-error {{no viable conversion}}
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#endif
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}
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namespace templ {
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#ifndef USE_PCH
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template<bool b>
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struct B {
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static constexpr bool value = b;
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};
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template<bool b>
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struct A {
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explicit(b) A(B<b>) {}
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template<typename T>
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explicit(b ^ T::value) operator T();
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};
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B<true> b_true;
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B<false> b_false;
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#else
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//expected-note@-8 {{candidate template ignored}}
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//expected-note@-8 {{explicit constructor declared here}}
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//expected-note@-15+ {{candidate constructor}}
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//expected-note@-8+ {{explicit conversion function is not a candidate (explicit specifier}}
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//expected-note@-11 {{explicit constructor is not a candidate (explicit specifier}}
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//CHECK: explicit(b){{ +}}A
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//CHECK: explicit(b{{ +}}^{{ +}}T::value){{ +}}operator
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A a = { b_true }; //expected-error {{class template argument deduction}}
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A a0 = b_true; //expected-error {{no viable constructor or deduction guide}}
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A a_true(b_true);
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A a_false = b_false;
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B<true> b = a_true;
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B<true> b1 = a_false; //expected-error {{no viable conversion}}
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B<false> b2(a_true);
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#endif
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}
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namespace guide {
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#ifndef USE_PCH
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template<typename T>
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struct A {
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A(T);
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};
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template<typename T>
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explicit(true) A(T) -> A<T>;
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explicit(false) A(int) -> A<int>;
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#else
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//expected-note@-5 {{explicit deduction guide}}
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//CHECK: explicit(true){{ +}}A(
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//CHECK: explicit(false){{ +}}A(
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A a = { 0.0 }; //expected-error {{explicit deduction guide}}
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A a1 = { 0 };
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#endif
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}
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#define USE_PCH
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