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// RUN: %clang_cc1 -fsyntax-only -verify %s
// Template argument deduction with template template parameters.
template<typename T, template<T> class A>
struct X0 {
static const unsigned value = 0;
};
template<template<int> class A>
struct X0<int, A> {
static const unsigned value = 1;
};
template<int> struct X0i;
template<long> struct X0l;
int array_x0a[X0<long, X0l>::value == 0? 1 : -1];
int array_x0b[X0<int, X0i>::value == 1? 1 : -1];
template<typename T, typename U>
struct is_same {
static const bool value = false;
};
template<typename T>
struct is_same<T, T> {
static const bool value = true;
};
template<typename T> struct allocator { };
template<typename T, typename Alloc = allocator<T> > struct vector {};
// Fun with meta-lambdas!
struct _1 {};
struct _2 {};
// Replaces all occurrences of _1 with Arg1 and _2 with Arg2 in T.
template<typename T, typename Arg1, typename Arg2>
struct Replace {
typedef T type;
};
// Replacement of the whole type.
template<typename Arg1, typename Arg2>
struct Replace<_1, Arg1, Arg2> {
typedef Arg1 type;
};
template<typename Arg1, typename Arg2>
struct Replace<_2, Arg1, Arg2> {
typedef Arg2 type;
};
// Replacement through cv-qualifiers
template<typename T, typename Arg1, typename Arg2>
struct Replace<const T, Arg1, Arg2> {
typedef typename Replace<T, Arg1, Arg2>::type const type;
};
// Replacement of templates
template<template<typename> class TT, typename T1, typename Arg1, typename Arg2>
struct Replace<TT<T1>, Arg1, Arg2> {
typedef TT<typename Replace<T1, Arg1, Arg2>::type> type;
};
template<template<typename, typename> class TT, typename T1, typename T2,
typename Arg1, typename Arg2>
struct Replace<TT<T1, T2>, Arg1, Arg2> {
typedef TT<typename Replace<T1, Arg1, Arg2>::type,
typename Replace<T2, Arg1, Arg2>::type> type;
};
// Just for kicks...
template<template<typename, typename> class TT, typename T1,
typename Arg1, typename Arg2>
struct Replace<TT<T1, _2>, Arg1, Arg2> {
typedef TT<typename Replace<T1, Arg1, Arg2>::type, Arg2> type;
};
int array0[is_same<Replace<_1, int, float>::type, int>::value? 1 : -1];
int array1[is_same<Replace<const _1, int, float>::type, const int>::value? 1 : -1];
int array2[is_same<Replace<vector<_1>, int, float>::type, vector<int> >::value? 1 : -1];
int array3[is_same<Replace<vector<const _1>, int, float>::type, vector<const int> >::value? 1 : -1];
int array4[is_same<Replace<vector<int, _2>, double, float>::type, vector<int, float> >::value? 1 : -1];
// PR5911
template <typename T, int N> void f(const T (&a)[N]);
int iarr[] = { 1 };
void test_PR5911() { f(iarr); }
// Must not examine base classes of incomplete type during template argument
// deduction.
namespace PR6257 {
template <typename T> struct X {
template <typename U> X(const X<U>& u);
};
struct A;
void f(A& a);
void f(const X<A>& a);
void test(A& a) { (void)f(a); }
}
// PR7463
namespace PR7463 {
const int f ();
template <typename T_> void g (T_&); // expected-note{{T_ = int}}
void h (void) { g(f()); } // expected-error{{no matching function for call}}
}
namespace test0 {
template <class T> void make(const T *(*fn)()); // expected-note {{candidate template ignored: can't deduce a type for 'T' which would make 'const T' equal 'char'}}
char *char_maker();
void test() {
make(char_maker); // expected-error {{no matching function for call to 'make'}}
}
}
namespace test1 {
template<typename T> void foo(const T a[3][3]);
void test() {
int a[3][3];
foo(a);
}
}
// PR7708
namespace test2 {
template<typename T> struct Const { typedef void const type; };
template<typename T> void f(T, typename Const<T>::type*);
template<typename T> void f(T, void const *);
void test() {
void *p = 0;
f(0, p);
}
}
// rdar://problem/8537391
namespace test3 {
struct Foo {
template <void F(char)> static inline void foo();
};
class Bar {
template<typename T> static inline void wobble(T ch);
public:
static void madness() {
Foo::foo<wobble<char> >();
}
};
}
// Verify that we can deduce enum-typed arguments correctly.
namespace test14 {
enum E { E0, E1 };
template <E> struct A {};
template <E e> void foo(const A<e> &a) {}
void test() {
A<E0> a;
foo(a);
}
}
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