--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaCXX/overload-call.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,690 @@
+// RUN: %clang_cc1 -triple %itanium_abi_triple -pedantic -verify %s
+// RUN: %clang_cc1 -triple %itanium_abi_triple -pedantic -verify -std=c++98 %s
+// RUN: %clang_cc1 -triple %itanium_abi_triple -pedantic -verify -std=c++11 %s
+
+int* f(int) { return 0; }
+float* f(float) { return 0; }
+void f();
+
+void test_f(int iv, float fv) {
+  float* fp = f(fv);
+  int* ip = f(iv);
+}
+
+int* g(int, float, int); // expected-note {{candidate function}}
+float* g(int, int, int);
+double* g(int, float, float); // expected-note {{candidate function}}
+char* g(int, float, ...);
+void g();
+
+void test_g(int iv, float fv) {
+  int* ip1 = g(iv, fv, 0);
+  float* fp1 = g(iv, iv, 0);
+  double* dp1 = g(iv, fv, fv);
+  char* cp1 = g(0, 0);
+  char* cp2 = g(0, 0, 0, iv, fv);
+
+  double* dp2 = g(0, fv, 1.5); // expected-error {{call to 'g' is ambiguous}}
+}
+
+double* h(double f);
+int* h(int);
+
+void test_h(float fv, unsigned char cv) {
+  double* dp = h(fv);
+  int* ip = h(cv);
+}
+
+int* i(int);
+double* i(long);
+
+void test_i(short sv, int iv, long lv, unsigned char ucv) {
+  int* ip1 = i(sv);
+  int* ip2 = i(iv);
+  int* ip3 = i(ucv);
+  double* dp1 = i(lv);
+}
+
+int* j(void*);
+double* j(bool);
+
+void test_j(int* ip) {
+  int* ip1 = j(ip);
+}
+
+int* k(char*);
+double* k(bool);
+
+void test_k() {
+  int* ip1 = k("foo");
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{conversion from string literal to 'char *' is deprecated}}
+#else
+  // expected-error@-4 {{cannot initialize a variable of type 'int *' with an rvalue of type 'double *'}}
+#endif
+
+  int* ip2 = k(("foo"));
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{conversion from string literal to 'char *' is deprecated}}
+#else
+  // expected-error@-4 {{cannot initialize a variable of type 'int *' with an rvalue of type 'double *'}}
+#endif
+  double* dp1 = k(L"foo");
+}
+
+int* l(wchar_t*);
+double* l(bool);
+
+void test_l() {
+  int* ip1 = l(L"foo");
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{conversion from string literal to 'wchar_t *' is deprecated}}
+#else
+  // expected-error@-4 {{cannot initialize a variable of type 'int *' with an rvalue of type 'double *'}}
+#endif
+  double* dp1 = l("foo");
+}
+
+int* m(const char*);
+double* m(char*);
+
+void test_m() {
+  int* ip = m("foo");
+}
+
+int* n(char*);
+double* n(void*);
+class E;
+
+void test_n(E* e) {
+  char ca[7];
+  int* ip1 = n(ca);
+  int* ip2 = n("foo");
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{conversion from string literal to 'char *' is deprecated}}
+#else
+  // expected-warning@-4 {{ISO C++11 does not allow conversion from string literal to 'char *'}}
+#endif
+  float fa[7];
+  double* dp1 = n(fa);
+
+  double* dp2 = n(e);
+}
+
+enum PromotesToInt {
+  PromotesToIntValue = -1
+};
+
+enum PromotesToUnsignedInt {
+  PromotesToUnsignedIntValue = __INT_MAX__ * 2U
+};
+
+int* o(int);
+double* o(unsigned int);
+float* o(long);
+
+void test_o() {
+  int* ip1 = o(PromotesToIntValue);
+  double* dp1 = o(PromotesToUnsignedIntValue);
+}
+
+int* p(int);
+double* p(double);
+
+void test_p() {
+  int* ip = p((short)1);
+  double* dp = p(1.0f);
+}
+
+struct Bits {
+  signed short int_bitfield : 5;
+  unsigned int uint_bitfield : 8;
+};
+
+int* bitfields(int, int);
+float* bitfields(unsigned int, int);
+
+void test_bitfield(Bits bits, int x) {
+  int* ip = bitfields(bits.int_bitfield, 0);
+  float* fp = bitfields(bits.uint_bitfield, 0u);
+}
+
+int* multiparm(long, int, long); // expected-note {{candidate function}}
+float* multiparm(int, int, int); // expected-note {{candidate function}}
+double* multiparm(int, int, short); // expected-note {{candidate function}}
+
+void test_multiparm(long lv, short sv, int iv) {
+  int* ip1 = multiparm(lv, iv, lv);
+  int* ip2 = multiparm(lv, sv, lv);
+  float* fp1 = multiparm(iv, iv, iv);
+  float* fp2 = multiparm(sv, iv, iv);
+  double* dp1 = multiparm(sv, sv, sv);
+  double* dp2 = multiparm(iv, sv, sv);
+  multiparm(sv, sv, lv); // expected-error {{call to 'multiparm' is ambiguous}}
+}
+
+// Test overloading based on qualification vs. no qualification
+// conversion.
+int* quals1(int const * p);
+char* quals1(int * p);
+
+int* quals2(int const * const * pp);
+char* quals2(int * * pp);
+
+int* quals3(int const * * const * ppp);
+char* quals3(int *** ppp);
+
+void test_quals(int * p, int * * pp, int * * * ppp) {
+  char* q1 = quals1(p);
+  char* q2 = quals2(pp);
+  char* q3 = quals3(ppp);
+}
+
+// Test overloading based on qualification ranking (C++ 13.3.2)p3.
+int* quals_rank1(int const * p);
+float* quals_rank1(int const volatile *p);
+char* quals_rank1(char*);
+double* quals_rank1(const char*);
+
+int* quals_rank2(int const * const * pp);
+float* quals_rank2(int * const * pp);
+
+void quals_rank3(int const * const * const volatile * p); // expected-note{{candidate function}}
+void quals_rank3(int const * const volatile * const * p); // expected-note{{candidate function}}
+
+void quals_rank3(int const *); // expected-note{{candidate function}}
+void quals_rank3(int volatile *); // expected-note{{candidate function}}
+
+void test_quals_ranking(int * p, int volatile *pq, int * * pp, int * * * ppp) {
+  int* q1 = quals_rank1(p);
+  float* q2 = quals_rank1(pq); 
+  double* q3 = quals_rank1("string literal");
+  char a[17];
+  const char* ap = a;
+  char* q4 = quals_rank1(a);
+  double* q5 = quals_rank1(ap);
+
+  float* q6 = quals_rank2(pp);
+
+  quals_rank3(ppp); // expected-error {{call to 'quals_rank3' is ambiguous}}
+
+  quals_rank3(p); // expected-error {{call to 'quals_rank3' is ambiguous}}
+  quals_rank3(pq);
+}
+
+// Test overloading based on derived-to-base conversions
+class A { };
+class B : public A { };
+class C : public B { };
+class D : public C { };
+
+int* derived1(A*);
+char* derived1(const A*);
+float* derived1(void*);
+
+int* derived2(A*);
+float* derived2(B*);
+
+int* derived3(A*);
+float* derived3(const B*);
+char* derived3(C*);
+
+void test_derived(B* b, B const* bc, C* c, const C* cc, void* v, D* d) {
+  int* d1 = derived1(b);
+  char* d2 = derived1(bc);
+  int* d3 = derived1(c);
+  char* d4 = derived1(cc);
+  float* d5 = derived1(v);
+
+  float* d6 = derived2(b);
+  float* d7 = derived2(c);
+
+  char* d8 = derived3(d);
+}
+
+void derived4(C*); // expected-note{{candidate function not viable: cannot convert from base class pointer 'A *' to derived class pointer 'C *' for 1st argument}}
+
+void test_base(A* a) {
+  derived4(a); // expected-error{{no matching function for call to 'derived4}}
+}
+
+// Test overloading of references. 
+// (FIXME: tests binding to determine candidate sets, not overload 
+//  resolution per se).
+int* intref(int&);
+float* intref(const int&);
+
+void intref_test() {
+  float* ir1 = intref(5);
+  float* ir2 = intref(5.5); // expected-warning{{implicit conversion from 'double' to 'int' changes value from 5.5 to 5}}
+}
+
+void derived5(C&); // expected-note{{candidate function not viable: cannot bind base class object of type 'A' to derived class reference 'C &' for 1st argument}}
+
+void test_base(A& a) {
+  derived5(a); // expected-error{{no matching function for call to 'derived5}}
+}
+
+// Test reference binding vs. standard conversions.
+int& bind_vs_conv(const double&);
+float& bind_vs_conv(int);
+
+void bind_vs_conv_test()
+{
+  int& i1 = bind_vs_conv(1.0f);
+  float& f1 = bind_vs_conv((short)1);
+}
+
+// Test that cv-qualifiers get subsumed in the reference binding.
+struct X { };
+struct Y { };
+struct Z : X, Y { };
+
+int& cvqual_subsume(X&); // expected-note{{candidate function}}
+float& cvqual_subsume(const Y&); // expected-note{{candidate function}}
+
+int& cvqual_subsume2(X&); // expected-note{{candidate function}}
+float& cvqual_subsume2(volatile Y&); // expected-note{{candidate function}}
+
+void cvqual_subsume_test(Z z) {
+  cvqual_subsume(z); // expected-error{{call to 'cvqual_subsume' is ambiguous}}
+  cvqual_subsume2(z); // expected-error{{call to 'cvqual_subsume2' is ambiguous}}
+}
+
+// Test overloading with cv-qualification differences in reference
+// binding.
+int& cvqual_diff(X&);
+float& cvqual_diff(const X&);
+
+void cvqual_diff_test(X x, Z z) {
+  int& i1 = cvqual_diff(x);
+  int& i2 = cvqual_diff(z);
+}
+
+// Test overloading with derived-to-base differences in reference
+// binding.
+struct Z2 : Z { };
+
+int& db_rebind(X&);
+long& db_rebind(Y&);
+float& db_rebind(Z&);
+
+void db_rebind_test(Z2 z2) {
+  float& f1 = db_rebind(z2);
+}
+
+class string { };
+class opt : public string { };
+
+struct SR {
+  SR(const string&);
+};
+
+void f(SR) { }
+
+void g(opt o) {
+  f(o);
+}
+
+
+namespace PR5756 {
+  int &a(void*, int);
+  float &a(void*, float);
+  void b() { 
+    int &ir = a(0,0);
+    (void)ir;
+  }
+}
+
+// Tests the exact text used to note the candidates
+namespace test1 {
+template <class T>
+void foo(T t, unsigned N);                        // expected-note {{candidate function template not viable: no known conversion from 'const char [6]' to 'unsigned int' for 2nd argument}}
+void foo(int n, char N);                          // expected-note {{candidate function not viable: no known conversion from 'const char [6]' to 'char' for 2nd argument}}
+void foo(int n, const char *s, int t);            // expected-note {{candidate function not viable: requires 3 arguments, but 2 were provided}}
+void foo(int n, const char *s, int t, ...);       // expected-note {{candidate function not viable: requires at least 3 arguments, but 2 were provided}}
+void foo(int n, const char *s, int t, int u = 0); // expected-note {{candidate function not viable: requires at least 3 arguments, but 2 were provided}}
+
+// PR 11857
+void foo(int n);                // expected-note {{candidate function not viable: requires single argument 'n', but 2 arguments were provided}}
+void foo(unsigned n = 10);      // expected-note {{candidate function not viable: allows at most single argument 'n', but 2 arguments were provided}}
+void bar(int n, int u = 0);     // expected-note {{candidate function not viable: requires at least argument 'n', but no arguments were provided}}
+void baz(int n = 0, int u = 0); // expected-note {{candidate function not viable: requires at most 2 arguments, but 3 were provided}}
+
+void test() {
+  foo(4, "hello"); //expected-error {{no matching function for call to 'foo'}}
+  bar();           //expected-error {{no matching function for call to 'bar'}}
+  baz(3, 4, 5);    // expected-error {{no matching function for call to 'baz'}}
+  }
+}
+
+// PR 6014
+namespace test2 {
+  struct QFixed {
+    QFixed(int i);
+    QFixed(long i);
+  };
+
+  bool operator==(const QFixed &f, int i);
+
+  class qrgb666 {
+    inline operator unsigned int () const;
+
+    inline bool operator==(const qrgb666 &v) const;
+    inline bool operator!=(const qrgb666 &v) const { return !(*this == v); }
+  };
+}
+
+// PR 6117
+namespace IncompleteConversion {
+  struct Complete {};
+  struct Incomplete;
+
+  void completeFunction(Complete *); // expected-note 2 {{cannot convert argument of incomplete type}}
+  void completeFunction(Complete &); // expected-note 2 {{cannot convert argument of incomplete type}}
+  
+  void testTypeConversion(Incomplete *P) {
+    completeFunction(P); // expected-error {{no matching function for call to 'completeFunction'}}
+    completeFunction(*P); // expected-error {{no matching function for call to 'completeFunction'}}
+  }
+  
+  void incompletePointerFunction(Incomplete *); // expected-note {{candidate function not viable: cannot convert argument of incomplete type 'IncompleteConversion::Incomplete' to 'IncompleteConversion::Incomplete *' for 1st argument; take the address of the argument with &}}
+  void incompleteReferenceFunction(Incomplete &); // expected-note {{candidate function not viable: cannot convert argument of incomplete type 'IncompleteConversion::Incomplete *' to 'IncompleteConversion::Incomplete &' for 1st argument; dereference the argument with *}}
+  
+  void testPointerReferenceConversion(Incomplete &reference, Incomplete *pointer) {
+    incompletePointerFunction(reference); // expected-error {{no matching function for call to 'incompletePointerFunction'}}
+    incompleteReferenceFunction(pointer); // expected-error {{no matching function for call to 'incompleteReferenceFunction'}}
+  }
+}
+
+namespace DerivedToBaseVsVoid {
+  struct A { };
+  struct B : A { };
+  
+  float &f(void *);
+  int &f(const A*);
+  
+  void g(B *b) {
+    int &ir = f(b);
+  }
+}
+
+// PR 6398 + PR 6421
+namespace test4 {
+  class A;
+  class B {
+    static void foo(); // expected-note {{not viable}}
+    static void foo(int*); // expected-note {{not viable}}
+    static void foo(long*); // expected-note {{not viable}}
+
+    void bar(A *a) { 
+      foo(a); // expected-error {{no matching function for call}}
+    }
+  };
+}
+
+namespace DerivedToBase {
+  struct A { };
+  struct B : A { };
+  struct C : B { };
+  
+  int &f0(const A&);
+  float &f0(B);
+  
+  void g() {
+    float &fr = f0(C());
+  }
+}
+
+namespace PR6483 {
+  struct X0 {
+    operator const unsigned int & () const;
+  };
+
+  struct X1 {
+    operator unsigned int & () const;
+  };
+
+  void f0(const bool &);
+  void f1(bool &); // expected-note 2{{not viable}}
+
+  void g(X0 x0, X1 x1) {
+    f0(x0);
+    f1(x0); // expected-error{{no matching function for call}}
+    f0(x1);
+    f1(x1); // expected-error{{no matching function for call}}
+  }  
+}
+
+namespace PR6078 {
+  struct A {
+    A(short); // expected-note{{candidate constructor}}
+    A(long); // expected-note{{candidate constructor}}
+  };
+  struct S {
+    typedef void ft(A);
+    operator ft*();
+  };
+
+  void f() {
+    S()(0); // expected-error{{conversion from 'int' to 'PR6078::A' is ambiguous}}
+  }
+}
+
+namespace PR6177 {
+  struct String { String(char const*); };
+
+  void f(bool const volatile&);
+  int &f(String);
+
+  void g() { int &r = f(""); }
+}
+
+namespace PR7095 {
+  struct X { };
+
+  struct Y {
+    operator const X*();
+
+  private:
+    operator X*();
+  };
+
+  void f(const X *);
+  void g(Y y) { f(y); }
+}
+
+namespace PR7224 {
+  class A {};
+  class B : public A {};
+
+  int &foo(A *const d);
+  float &foo(const A *const d);
+
+  void bar()
+  {
+    B *const d = 0;
+    B const *const d2 = 0;
+    int &ir = foo(d);
+    float &fr = foo(d2);
+  }
+}
+
+namespace NontrivialSubsequence {
+  struct X0;
+
+  class A {
+    operator X0 *();
+  public:
+    operator const X0 *();
+  };
+ 
+  A a;
+  void foo( void const * );
+
+  void g() {
+    foo(a);
+  }
+}
+
+// rdar://rdar8499524
+namespace rdar8499524 {
+  struct W {};
+  struct S {
+      S(...);
+  };
+
+  void g(const S&);
+  void f() {
+    g(W());
+  }
+}
+
+namespace rdar9173984 {
+  template <typename T, unsigned long N> int &f(const T (&)[N]);
+  template <typename T> float &f(const T *);
+
+  void test() {
+    int arr[2] = {0, 0};
+    int *arrp = arr;
+    int &ir = f(arr);
+    float &fr = f(arrp);
+  }
+}
+
+namespace PR9507 {
+  void f(int * const&); // expected-note{{candidate function}}
+  void f(int const(&)[1]); // expected-note{{candidate function}}
+ 
+  int main() {
+    int n[1];
+    f(n); // expected-error{{call to 'f' is ambiguous}}
+  }
+}
+
+namespace rdar9803316 {
+  void foo(float);
+  int &foo(int);
+
+  void bar() {
+    int &ir = (&foo)(0);
+  }
+}
+
+namespace IncompleteArg {
+  // Ensure that overload resolution attempts to complete argument types when
+  // performing ADL.
+  template<typename T> struct S {
+    friend int f(const S&);
+  };
+  extern S<int> s;
+  int k = f(s);
+
+  template<typename T> struct Op {
+    friend bool operator==(const Op &, const Op &);
+  };
+  extern Op<char> op;
+  bool b = op == op;
+
+  // ... and not in other cases! Nothing here requires U<int()> to be complete.
+  // (Note that instantiating U<int()> will fail.)
+  template<typename T> struct U {
+    T t;
+  };
+  struct Consumer {
+    template<typename T>
+    int operator()(const U<T> &);
+  };
+  template<typename T> U<T> &make();
+  Consumer c;
+  int n = sizeof(c(make<int()>()));
+}
+
+namespace PR12142 {
+  void fun(int (*x)[10]); // expected-note{{candidate function not viable: 1st argument ('const int (*)[10]') would lose const qualifier}}
+  void g() { fun((const int(*)[10])0); } // expected-error{{no matching function for call to 'fun'}}
+}
+
+// DR1152: Take 'volatile' into account when handling reference bindings in
+//         overload resolution.
+namespace PR12931 {
+  void f(const int &, ...);
+  void f(const volatile int &, int);
+  void g() { f(0, 0); }
+}
+
+void test5() {
+  struct {
+    typedef void F1(int);
+    typedef void F2(double);
+    operator F1*();  // expected-note{{conversion candidate}}
+    operator F2*();  // expected-note{{conversion candidate}}
+  } callable;
+  callable();  // expected-error{{no matching function for call}}
+}
+
+namespace PR20218 {
+  void f(void (*const &)()); // expected-note 2{{candidate}}
+  void f(void (&&)()) = delete; // expected-note 2{{candidate}}
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{rvalue references are a C++11 extension}}
+  // expected-warning@-3 {{deleted function definitions are a C++11 extension}}
+#endif
+  void g(void (&&)()) = delete; // expected-note 2{{candidate}}
+#if __cplusplus <= 199711L
+  // expected-warning@-2 {{rvalue references are a C++11 extension}}
+  // expected-warning@-3 {{deleted function definitions are a C++11 extension}}
+#endif
+  void g(void (*const &)()); // expected-note 2{{candidate}}
+
+  void x();
+  typedef void (&fr)();
+  struct Y { operator fr(); } y;
+
+  void h() {
+    f(x); // expected-error {{ambiguous}}
+    g(x); // expected-error {{ambiguous}}
+    f(y); // expected-error {{ambiguous}}
+    g(y); // expected-error {{ambiguous}}
+  }
+}
+
+namespace StringLiteralToCharAmbiguity {
+  void f(char *, int);
+  void f(const char *, unsigned);
+  void g() { f("foo", 0); }
+#if __cplusplus <= 199711L
+  // expected-error@-2 {{call to 'f' is ambiguous}}
+  // expected-note@-5 {{candidate function}}
+  // expected-note@-5 {{candidate function}}
+#endif
+}
+
+namespace ProduceNotesAfterSFINAEFailure {
+  struct A {
+    template<typename T, typename U = typename T::x> A(T); // expected-warning 0-1{{extension}}
+  };
+  void f(void*, A); // expected-note {{candidate function not viable}}
+  void g() { f(1, 2); } // expected-error {{no matching function}}
+}
+
+namespace PR19808 {
+  struct B {
+    int i;
+    void bar();
+  };
+  struct D : public B{};
+
+  void f(bool);
+  void f(int D::*);
+  void f(void (D::*)());
+
+  void Usage() {
+    int B::*pmem;
+    void (B::*pmf)();
+
+    // These should not be ambiguous.
+    f(pmem);
+    f(pmf);
+  }
+}