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e0ad34e565
When checking deduction consistency, a substitution can be incomplete such that only sugar parts refer to non-deduced template parameters. This would not otherwise lead to an inconsistent deduction, so this patch makes it so we canonicalize the types before substitution in order to avoid that possibility, for now. When we are able to produce substitution failure diagnostics for partial ordering, we might want to improve the TemplateInstantiator so that it does not fail in that case. This fixes a regression on top of #100692, which was reported on the PR. This was never released, so there are no release notes.
124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
// RUN: %clang_cc1 -std=c++23 -verify %s
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namespace t1 {
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template<bool> struct enable_if { typedef void type; };
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template <class T> class Foo {};
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template <class X> constexpr bool check() { return true; }
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template <class X, class Enable = void> struct Bar {};
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namespace param {
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template<class X> void func(Bar<X, typename enable_if<check<X>()>::type>) {}
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// expected-note@-1 2{{candidate function}}
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template<class T> void func(Bar<Foo<T>>) {}
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// expected-note@-1 2{{candidate function}}
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void g() {
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func(Bar<Foo<int>>()); // expected-error {{call to 'func' is ambiguous}}
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void (*ptr)(Bar<Foo<int>>){func};
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// expected-error@-1 {{address of overloaded function 'func' is ambiguous}}
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}
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} // namespace param
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namespace ret {
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template<class X> Bar<X, typename enable_if<check<X>()>::type> func();
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// expected-note@-1 {{candidate function}}
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template<class T> Bar<Foo<T>> func();
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// expected-note@-1 {{candidate function}}
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void g() {
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Bar<Foo<int>> (*ptr)(){func};
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// expected-error@-1 {{address of overloaded function 'func' is ambiguous}}
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}
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} // namespace ret
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namespace conv {
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struct A {
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template<class X> operator Bar<X, typename enable_if<check<X>()>::type>();
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// expected-note@-1 {{candidate function}}
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template<class T> operator Bar<Foo<T>>();
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// expected-note@-1 {{candidate function}}
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};
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void g() {
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Bar<Foo<int>> x = A();
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// expected-error@-1 {{conversion from 'A' to 'Bar<Foo<int>>' is ambiguous}}
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}
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} // namespace conv
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} // namespace t1
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namespace t2 {
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template <bool> struct enable_if;
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template <> struct enable_if<true> {
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typedef int type;
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};
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struct pair {
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template <int = 0> pair(int);
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template <class _U2, enable_if<__is_constructible(int &, _U2)>::type = 0>
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pair(_U2 &&);
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};
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int test_test_i;
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void test() { pair{test_test_i}; }
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} // namespace t2
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namespace t3 {
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template <class _Tp> void to_address(_Tp);
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template <class _Pointer> auto to_address(_Pointer __p) -> decltype(__p);
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template <class _CharT> struct basic_string_view {
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basic_string_view(_CharT);
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template <class _It> requires requires(_It __i) { to_address(__i); }
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basic_string_view(_It);
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};
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void operatorsv() { basic_string_view(0); }
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} // namespace t3
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namespace func_pointer {
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template <class> struct __promote {
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using type = float;
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};
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template <class> class complex {};
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namespace ret {
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template <class _Tp> complex<_Tp> pow(const complex<_Tp> &) {};
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template <class _Tp> complex<typename __promote<_Tp>::type> pow(_Tp) = delete;
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complex<float> (*ptr)(const complex<float> &){pow};
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} // namespace ret
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namespace param {
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template <class _Tp> void pow(const complex<_Tp> &, complex<_Tp>) {};
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template <class _Tp> void pow(_Tp, complex<typename __promote<_Tp>::type>) = delete;
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void (*ptr)(const complex<float> &, complex<float>){pow};
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} // namespace param
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} // namespace func_pointer
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namespace static_vs_nonstatic {
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namespace implicit_obj_param {
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struct A {
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template <class... Args>
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static void f(int a, Args... args) {}
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template <class... Args>
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void f(Args... args) = delete;
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};
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void g(){
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A::f(0);
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}
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} // namespace implicit_obj_param
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namespace explicit_obj_param {
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struct A {
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template <class... Args>
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static void f(int, Args... args) {}
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template <class... Args>
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void f(this A *, Args... args) = delete;
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};
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void g(){
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A::f(0);
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}
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} // namespace explicit_obj_param
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} // namespace static_vs_nonstatic
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namespace incomplete_on_sugar {
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template <unsigned P, class T> void f(T[P]) = delete;
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template <unsigned P> void f(int[][P]);
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void test() {
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int array[1][8];
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f<8>(array);
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}
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} // namespace incomplete_on_sugar
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