484 lines
15 KiB
C++
484 lines
15 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
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// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++1z
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// Template argument deduction with template template parameters.
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template<typename T, template<T> class A>
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struct X0 {
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static const unsigned value = 0;
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};
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template<template<int> class A>
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struct X0<int, A> {
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static const unsigned value = 1;
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};
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template<int> struct X0i;
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template<long> struct X0l;
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int array_x0a[X0<long, X0l>::value == 0? 1 : -1];
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int array_x0b[X0<int, X0i>::value == 1? 1 : -1];
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template<typename T, typename U>
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struct is_same {
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static const bool value = false;
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};
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template<typename T>
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struct is_same<T, T> {
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static const bool value = true;
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};
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template<typename T> struct allocator { };
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template<typename T, typename Alloc = allocator<T> > struct vector {};
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// Fun with meta-lambdas!
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struct _1 {};
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struct _2 {};
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// Replaces all occurrences of _1 with Arg1 and _2 with Arg2 in T.
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template<typename T, typename Arg1, typename Arg2>
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struct Replace {
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typedef T type;
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};
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// Replacement of the whole type.
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template<typename Arg1, typename Arg2>
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struct Replace<_1, Arg1, Arg2> {
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typedef Arg1 type;
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};
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template<typename Arg1, typename Arg2>
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struct Replace<_2, Arg1, Arg2> {
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typedef Arg2 type;
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};
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// Replacement through cv-qualifiers
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template<typename T, typename Arg1, typename Arg2>
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struct Replace<const T, Arg1, Arg2> {
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typedef typename Replace<T, Arg1, Arg2>::type const type;
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};
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// Replacement of templates
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template<template<typename> class TT, typename T1, typename Arg1, typename Arg2>
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struct Replace<TT<T1>, Arg1, Arg2> {
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typedef TT<typename Replace<T1, Arg1, Arg2>::type> type;
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};
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template<template<typename, typename> class TT, typename T1, typename T2,
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typename Arg1, typename Arg2>
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struct Replace<TT<T1, T2>, Arg1, Arg2> {
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typedef TT<typename Replace<T1, Arg1, Arg2>::type,
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typename Replace<T2, Arg1, Arg2>::type> type;
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};
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// Just for kicks...
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template<template<typename, typename> class TT, typename T1,
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typename Arg1, typename Arg2>
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struct Replace<TT<T1, _2>, Arg1, Arg2> {
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typedef TT<typename Replace<T1, Arg1, Arg2>::type, Arg2> type;
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};
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int array0[is_same<Replace<_1, int, float>::type, int>::value? 1 : -1];
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int array1[is_same<Replace<const _1, int, float>::type, const int>::value? 1 : -1];
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int array2[is_same<Replace<vector<_1>, int, float>::type, vector<int> >::value? 1 : -1];
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int array3[is_same<Replace<vector<const _1>, int, float>::type, vector<const int> >::value? 1 : -1];
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int array4[is_same<Replace<vector<int, _2>, double, float>::type, vector<int, float> >::value? 1 : -1];
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// PR5911
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template <typename T, int N> void f(const T (&a)[N]);
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int iarr[] = { 1 };
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void test_PR5911() { f(iarr); }
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// Must not examine base classes of incomplete type during template argument
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// deduction.
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namespace PR6257 {
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template <typename T> struct X {
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template <typename U> X(const X<U>& u);
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};
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struct A;
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void f(A& a);
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void f(const X<A>& a);
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void test(A& a) { (void)f(a); }
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}
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// PR7463
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namespace PR7463 {
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const int f ();
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template <typename T_> void g (T_&); // expected-note{{T_ = int}}
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void h (void) { g(f()); } // expected-error{{no matching function for call}}
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}
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namespace test0 {
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template <class T> void make(const T *(*fn)()); // expected-note {{candidate template ignored: cannot deduce a type for 'T' that would make 'const T' equal 'char'}}
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char *char_maker();
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void test() {
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make(char_maker); // expected-error {{no matching function for call to 'make'}}
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}
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}
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namespace test1 {
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template<typename T> void foo(const T a[3][3]);
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void test() {
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int a[3][3];
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foo(a);
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}
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}
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// PR7708
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namespace test2 {
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template<typename T> struct Const { typedef void const type; };
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template<typename T> void f(T, typename Const<T>::type*);
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template<typename T> void f(T, void const *);
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void test() {
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void *p = 0;
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f(0, p);
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}
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}
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// rdar://problem/8537391
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namespace test3 {
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struct Foo {
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template <void F(char)> static inline void foo();
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};
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class Bar {
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template<typename T> static inline void wobble(T ch);
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public:
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static void madness() {
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Foo::foo<wobble<char> >();
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}
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};
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}
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// Verify that we can deduce enum-typed arguments correctly.
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namespace test14 {
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enum E { E0, E1 };
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template <E> struct A {};
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template <E e> void foo(const A<e> &a) {}
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void test() {
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A<E0> a;
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foo(a);
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}
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}
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namespace PR21536 {
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template<typename ...T> struct X;
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template<typename A, typename ...B> struct S {
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static_assert(sizeof...(B) == 1, "");
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void f() {
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using T = A;
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using T = int;
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using U = X<B...>;
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using U = X<int>;
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}
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};
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template<typename ...T> void f(S<T...>);
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void g() { f(S<int, int>()); }
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}
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namespace PR19372 {
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template <template<typename...> class C, typename ...Us> struct BindBack {
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template <typename ...Ts> using apply = C<Ts..., Us...>;
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};
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template <typename, typename...> struct Y;
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template <typename ...Ts> using Z = Y<Ts...>;
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using T = BindBack<Z, int>::apply<>;
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using T = Z<int>;
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using U = BindBack<Z, int, int>::apply<char>;
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using U = Z<char, int, int>;
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namespace BetterReduction {
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template<typename ...> struct S;
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template<typename ...A> using X = S<A...>; // expected-note {{parameter}}
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template<typename ...A> using Y = X<A..., A...>;
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template<typename ...A> using Z = X<A..., 1, 2, 3>; // expected-error {{must be a type}}
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using T = Y<int>;
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using T = S<int, int>;
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}
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}
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namespace PR18645 {
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template<typename F> F Quux(F &&f);
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auto Baz = Quux(Quux<float>);
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}
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namespace NonDeducedNestedNameSpecifier {
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template<typename T> struct A {
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template<typename U> struct B {
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B(int) {}
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};
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};
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template<typename T> int f(A<T>, typename A<T>::template B<T>);
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int k = f(A<int>(), 0);
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}
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namespace PR27601_RecursivelyInheritedBaseSpecializationsDeductionAmbiguity {
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namespace ns1 {
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template<class...> struct B { };
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template<class H, class ... Ts> struct B<H, Ts...> : B<> { };
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template<class ... Ts> struct D : B<Ts...> { };
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template<class T, class ... Ts> void f(B<T, Ts...> &) { }
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int main() {
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D<int, char> d;
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f<int>(d);
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}
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} //end ns1
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namespace ns2 {
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template <int i, typename... Es> struct tup_impl;
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template <int i> struct tup_impl<i> {}; // empty tail
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template <int i, typename Head, typename... Tail>
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struct tup_impl<i, Head, Tail...> : tup_impl<i + 1, Tail...> {
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using value_type = Head;
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Head head;
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};
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template <typename... Es> struct tup : tup_impl<0, Es...> {};
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template <typename Head, int i, typename... Tail>
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Head &get_helper(tup_impl<i, Head, Tail...> &t) {
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return t.head;
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}
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template <typename Head, int i, typename... Tail>
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Head const &get_helper(tup_impl<i, Head, Tail...> const &t) {
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return t.head;
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}
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int main() {
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tup<int, double, char> t;
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get_helper<double>(t);
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return 0;
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}
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} // end ns2
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}
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namespace multiple_deduction_different_type {
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template<typename T, T v> struct X {};
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template<template<typename T, T> class X, typename T, typename U, int N>
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void f(X<T, N>, X<U, N>) {} // expected-note 2{{values of conflicting types}}
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template<template<typename T, T> class X, typename T, typename U, const int *N>
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void g(X<T, N>, X<U, N>) {} // expected-note 0-2{{values of conflicting types}}
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int n;
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void h() {
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f(X<int, 1+1>(), X<unsigned int, 3-1>()); // expected-error {{no matching function}}
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f(X<unsigned int, 1+1>(), X<int, 3-1>()); // expected-error {{no matching function}}
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#if __cplusplus > 201402L
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g(X<const int*, &n>(), X<int*, &n + 1 - 1>()); // expected-error {{no matching function}}
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g(X<int*, &n>(), X<const int*, &n + 1 - 1>()); // expected-error {{no matching function}}
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#endif
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}
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template<template<typename T, T> class X, typename T, typename U, T N>
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void x(X<T, N>, int(*)[N], X<U, N>) {} // expected-note 1+{{candidate}}
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template<template<typename T, T> class X, typename T, typename U, T N>
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void x(int(*)[N], X<T, N>, X<U, N>) {} // expected-note 1+{{candidate}}
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int arr[3];
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void y() {
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x(X<int, 3>(), &arr, X<int, 3>());
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x(&arr, X<int, 3>(), X<int, 3>());
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x(X<int, 3>(), &arr, X<char, 3>()); // expected-error {{no matching function}}
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x(&arr, X<int, 3>(), X<char, 3>()); // expected-error {{no matching function}}
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x(X<char, 3>(), &arr, X<char, 3>());
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x(&arr, X<char, 3>(), X<char, 3>());
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}
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}
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namespace nullptr_deduction {
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using nullptr_t = decltype(nullptr);
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template<typename T, T v> struct X {};
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template<typename T, T v> void f(X<T, v>) {
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static_assert(!v, "");
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}
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void g() {
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f(X<int*, nullptr>());
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f(X<nullptr_t, nullptr>());
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}
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template<template<typename T, T> class X, typename T, typename U, int *P>
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void f1(X<T, P>, X<U, P>) {} // expected-note 2{{values of conflicting types}}
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void h() {
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f1(X<int*, nullptr>(), X<nullptr_t, nullptr>()); // expected-error {{no matching function}}
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f1(X<nullptr_t, nullptr>(), X<int*, nullptr>()); // expected-error {{no matching function}}
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}
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template<template<typename T, T> class X, typename T, typename U, nullptr_t P>
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void f2(X<T, P>, X<U, P>) {} // expected-note 2{{values of conflicting types}}
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void i() {
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f2(X<int*, nullptr>(), X<nullptr_t, nullptr>()); // expected-error {{no matching function}}
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f2(X<nullptr_t, nullptr>(), X<int*, nullptr>()); // expected-error {{no matching function}}
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}
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}
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namespace member_pointer {
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struct A { void f(int); };
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template<typename T, void (A::*F)(T)> struct B;
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template<typename T> struct C;
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template<typename T, void (A::*F)(T)> struct C<B<T, F>> {
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C() { A a; T t; (a.*F)(t); }
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};
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C<B<int, &A::f>> c;
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}
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namespace deduction_substitution_failure {
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template<typename T> struct Fail { typedef typename T::error error; }; // expected-error 2{{prior to '::'}}
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template<typename T, typename U> struct A {};
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template<typename T> struct A<T, typename Fail<T>::error> {}; // expected-note {{instantiation of}}
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A<int, int> ai; // expected-note {{during template argument deduction for class template partial specialization 'A<T, typename Fail<T>::error>' [with T = int]}} expected-note {{in instantiation of template class 'deduction_substitution_failure::A<int, int>'}}
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template<typename T, typename U> int B; // expected-warning 0-1 {{extension}}
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template<typename T> int B<T, typename Fail<T>::error> {}; // expected-note {{instantiation of}}
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int bi = B<char, char>; // expected-note {{during template argument deduction for variable template partial specialization 'B<T, typename Fail<T>::error>' [with T = char]}}
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}
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namespace deduction_after_explicit_pack {
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template<typename ...T, typename U> int *f(T ...t, int &r, U *u) {
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return u;
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}
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template<typename U, typename ...T> int *g(T ...t, int &r, U *u) {
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return u;
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}
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void h(float a, double b, int c) {
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f<float&, double&>(a, b, c, &c); // ok
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g<int, float&, double&>(a, b, c, &c); // ok
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}
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template<class... ExtraArgs>
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int test(ExtraArgs..., unsigned vla_size, const char *input);
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int n = test(0, "");
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template <typename... T> void i(T..., int, T..., ...); // expected-note 5{{deduced conflicting}}
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void j() {
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i(0);
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i(0, 1); // expected-error {{no match}}
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i(0, 1, 2); // expected-error {{no match}}
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i<>(0);
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i<>(0, 1); // expected-error {{no match}}
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i<>(0, 1, 2); // expected-error {{no match}}
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i<int, int>(0, 1, 2, 3, 4);
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i<int, int>(0, 1, 2, 3, 4, 5); // expected-error {{no match}}
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}
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// GCC alarmingly accepts this by deducing T={int} by matching the second
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// parameter against the first argument, then passing the first argument
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// through the first parameter.
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template<typename... T> struct X { X(int); operator int(); };
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template<typename... T> void p(T..., X<T...>, ...); // expected-note {{deduced conflicting}}
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void q() { p(X<int>(0), 0); } // expected-error {{no match}}
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struct A {
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template <typename T> void f(T, void *, int = 0); // expected-note 2{{no known conversion from 'double' to 'void *' for 2nd argument}}
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void f(); // expected-note 2{{requires 0}}
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template <typename T> static void g(T, void *, int = 0); // expected-note 2{{no known conversion from 'double' to 'void *' for 2nd argument}}
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void g(); // expected-note 2{{requires 0}}
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void h() {
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f(1.0, 2.0); // expected-error {{no match}}
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g(1.0, 2.0); // expected-error {{no match}}
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}
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};
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void f(A a) {
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a.f(1.0, 2.0); // expected-error {{no match}}
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a.g(1.0, 2.0); // expected-error {{no match}}
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}
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}
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namespace overload_vs_pack {
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void f(int);
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void f(float);
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void g(double);
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template<typename ...T> struct X {};
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template<typename ...T> void x(T...);
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template<typename ...T> struct Y { typedef int type(typename T::error...); };
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template<> struct Y<int, float, double> { typedef int type; };
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template<typename ...T> typename Y<T...>::type g1(X<T...>, void (*...fns)(T)); // expected-note {{deduced conflicting types for parameter 'T' (<int, float> vs. <(no value), double>)}}
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template<typename ...T> typename Y<T...>::type g2(void(*)(T...), void (*...fns)(T)); // expected-note {{deduced conflicting types for parameter 'T' (<int, float> vs. <(no value), double>)}}
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template<typename T> int &h1(decltype(g1(X<int, float, T>(), f, f, g)) *p);
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template<typename T> float &h1(...);
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template<typename T> int &h2(decltype(g2(x<int, float, T>, f, f, g)) *p);
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template<typename T> float &h2(...);
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int n1 = g1(X<int, float>(), f, g); // expected-error {{no matching function}}
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int n2 = g2(x<int, float>, f, g); // expected-error {{no matching function}}
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int &a1 = h1<double>(0); // ok, skip deduction for 'f's, deduce matching value from 'g'
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int &a2 = h2<double>(0);
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float &b1 = h1<float>(0); // deduce mismatching value from 'g', so we do not trigger instantiation of Y
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float &b2 = h2<float>(0);
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template<typename ...T> int partial_deduction(void (*...f)(T)); // expected-note {{deduced incomplete pack <(no value), double> for template parameter 'T'}}
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int pd1 = partial_deduction(f, g); // expected-error {{no matching function}}
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template<typename ...T> int partial_deduction_2(void (*...f)(T), ...); // expected-note {{deduced incomplete pack <(no value), double> for template parameter 'T'}}
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int pd2 = partial_deduction_2(f, g); // expected-error {{no matching function}}
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namespace cwg_example {
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void f(char, char);
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void f(int, int);
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void x(int, char);
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template<typename T, typename ...U> void j(void(*)(U...), void (*...fns)(T, U));
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void test() { j(x, f, x); }
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}
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}
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namespace b29946541 {
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template<typename> class A {};
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template<typename T, typename U, template<typename, typename> class C>
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void f(C<T, U>); // expected-note {{failed template argument deduction}}
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void g(A<int> a) { f(a); } // expected-error {{no match}}
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}
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namespace deduction_from_empty_list {
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template<int M, int N = 5> void f(int (&&)[N], int (&&)[N]) { // expected-note {{1 vs. 2}}
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static_assert(M == N, "");
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}
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void test() {
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f<5>({}, {});
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f<1>({}, {0});
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f<1>({0}, {});
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f<1>({0}, {0});
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f<1>({0}, {0, 1}); // expected-error {{no matching}}
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}
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}
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namespace check_extended_pack {
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template<typename T> struct X { typedef int type; };
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template<typename ...T> void f(typename X<T>::type...);
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template<typename T> void f(T, int, int);
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void g() {
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|
f<int>(0, 0, 0);
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|
}
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|
|
|
template<int, int*> struct Y {};
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|
template<int ...N> void g(Y<N...>); // expected-note {{deduced non-type template argument does not have the same type as the corresponding template parameter ('int *' vs 'int')}}
|
|
int n;
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|
void h() { g<0>(Y<0, &n>()); } // expected-error {{no matching function}}
|
|
}
|