1// RUN: %clang_cc1 -fsyntax-only -pedantic -verify %s 2int* f(int) { return 0; } 3float* f(float) { return 0; } 4void f(); 5 6void test_f(int iv, float fv) { 7 float* fp = f(fv); 8 int* ip = f(iv); 9} 10 11int* g(int, float, int); // expected-note {{candidate function}} 12float* g(int, int, int); // expected-note {{candidate function}} 13double* g(int, float, float); // expected-note {{candidate function}} 14char* g(int, float, ...); // expected-note {{candidate function}} 15void g(); 16 17void test_g(int iv, float fv) { 18 int* ip1 = g(iv, fv, 0); 19 float* fp1 = g(iv, iv, 0); 20 double* dp1 = g(iv, fv, fv); 21 char* cp1 = g(0, 0); 22 char* cp2 = g(0, 0, 0, iv, fv); 23 24 double* dp2 = g(0, fv, 1.5); // expected-error {{call to 'g' is ambiguous}} 25} 26 27double* h(double f); 28int* h(int); 29 30void test_h(float fv, unsigned char cv) { 31 double* dp = h(fv); 32 int* ip = h(cv); 33} 34 35int* i(int); 36double* i(long); 37 38void test_i(short sv, int iv, long lv, unsigned char ucv) { 39 int* ip1 = i(sv); 40 int* ip2 = i(iv); 41 int* ip3 = i(ucv); 42 double* dp1 = i(lv); 43} 44 45int* j(void*); 46double* j(bool); 47 48void test_j(int* ip) { 49 int* ip1 = j(ip); 50} 51 52int* k(char*); 53double* k(bool); 54 55void test_k() { 56 int* ip1 = k("foo"); // expected-warning{{conversion from string literal to 'char *' is deprecated}} 57 int* ip2 = k(("foo")); // expected-warning{{conversion from string literal to 'char *' is deprecated}} 58 double* dp1 = k(L"foo"); 59} 60 61int* l(wchar_t*); 62double* l(bool); 63 64void test_l() { 65 int* ip1 = l(L"foo"); // expected-warning{{conversion from string literal to 'wchar_t *' is deprecated}} 66 double* dp1 = l("foo"); 67} 68 69int* m(const char*); 70double* m(char*); 71 72void test_m() { 73 int* ip = m("foo"); 74} 75 76int* n(char*); 77double* n(void*); 78class E; 79 80void test_n(E* e) { 81 char ca[7]; 82 int* ip1 = n(ca); 83 int* ip2 = n("foo"); // expected-warning{{conversion from string literal to 'char *' is deprecated}} 84 85 float fa[7]; 86 double* dp1 = n(fa); 87 88 double* dp2 = n(e); 89} 90 91enum PromotesToInt { 92 PromotesToIntValue = -1 93}; 94 95enum PromotesToUnsignedInt { 96 PromotesToUnsignedIntValue = __INT_MAX__ * 2U 97}; 98 99int* o(int); 100double* o(unsigned int); 101float* o(long); 102 103void test_o() { 104 int* ip1 = o(PromotesToIntValue); 105 double* dp1 = o(PromotesToUnsignedIntValue); 106} 107 108int* p(int); 109double* p(double); 110 111void test_p() { 112 int* ip = p((short)1); 113 double* dp = p(1.0f); 114} 115 116struct Bits { 117 signed short int_bitfield : 5; 118 unsigned int uint_bitfield : 8; 119}; 120 121int* bitfields(int, int); 122float* bitfields(unsigned int, int); 123 124void test_bitfield(Bits bits, int x) { 125 int* ip = bitfields(bits.int_bitfield, 0); 126 float* fp = bitfields(bits.uint_bitfield, 0u); 127} 128 129int* multiparm(long, int, long); // expected-note {{candidate function}} 130float* multiparm(int, int, int); // expected-note {{candidate function}} 131double* multiparm(int, int, short); // expected-note {{candidate function}} 132 133void test_multiparm(long lv, short sv, int iv) { 134 int* ip1 = multiparm(lv, iv, lv); 135 int* ip2 = multiparm(lv, sv, lv); 136 float* fp1 = multiparm(iv, iv, iv); 137 float* fp2 = multiparm(sv, iv, iv); 138 double* dp1 = multiparm(sv, sv, sv); 139 double* dp2 = multiparm(iv, sv, sv); 140 multiparm(sv, sv, lv); // expected-error {{call to 'multiparm' is ambiguous}} 141} 142 143// Test overloading based on qualification vs. no qualification 144// conversion. 145int* quals1(int const * p); 146char* quals1(int * p); 147 148int* quals2(int const * const * pp); 149char* quals2(int * * pp); 150 151int* quals3(int const * * const * ppp); 152char* quals3(int *** ppp); 153 154void test_quals(int * p, int * * pp, int * * * ppp) { 155 char* q1 = quals1(p); 156 char* q2 = quals2(pp); 157 char* q3 = quals3(ppp); 158} 159 160// Test overloading based on qualification ranking (C++ 13.3.2)p3. 161int* quals_rank1(int const * p); 162float* quals_rank1(int const volatile *p); 163char* quals_rank1(char*); 164double* quals_rank1(const char*); 165 166int* quals_rank2(int const * const * pp); 167float* quals_rank2(int * const * pp); 168 169void quals_rank3(int const * const * const volatile * p); // expected-note{{candidate function}} 170void quals_rank3(int const * const volatile * const * p); // expected-note{{candidate function}} 171 172void quals_rank3(int const *); // expected-note{{candidate function}} 173void quals_rank3(int volatile *); // expected-note{{candidate function}} 174 175void test_quals_ranking(int * p, int volatile *pq, int * * pp, int * * * ppp) { 176 int* q1 = quals_rank1(p); 177 float* q2 = quals_rank1(pq); 178 double* q3 = quals_rank1("string literal"); 179 char a[17]; 180 const char* ap = a; 181 char* q4 = quals_rank1(a); 182 double* q5 = quals_rank1(ap); 183 184 float* q6 = quals_rank2(pp); 185 186 quals_rank3(ppp); // expected-error {{call to 'quals_rank3' is ambiguous}} 187 188 quals_rank3(p); // expected-error {{call to 'quals_rank3' is ambiguous}} 189 quals_rank3(pq); 190} 191 192// Test overloading based on derived-to-base conversions 193class A { }; 194class B : public A { }; 195class C : public B { }; 196class D : public C { }; 197 198int* derived1(A*); 199char* derived1(const A*); 200float* derived1(void*); 201 202int* derived2(A*); 203float* derived2(B*); 204 205int* derived3(A*); 206float* derived3(const B*); 207char* derived3(C*); 208 209void test_derived(B* b, B const* bc, C* c, const C* cc, void* v, D* d) { 210 int* d1 = derived1(b); 211 char* d2 = derived1(bc); 212 int* d3 = derived1(c); 213 char* d4 = derived1(cc); 214 float* d5 = derived1(v); 215 216 float* d6 = derived2(b); 217 float* d7 = derived2(c); 218 219 char* d8 = derived3(d); 220} 221 222void derived4(C*); // expected-note{{candidate function not viable: cannot convert from base class pointer 'A *' to derived class pointer 'C *' for 1st argument}} 223 224void test_base(A* a) { 225 derived4(a); // expected-error{{no matching function for call to 'derived4}} 226} 227 228// Test overloading of references. 229// (FIXME: tests binding to determine candidate sets, not overload 230// resolution per se). 231int* intref(int&); 232float* intref(const int&); 233 234void intref_test() { 235 float* ir1 = intref(5); 236 float* ir2 = intref(5.5); // expected-warning{{implicit conversion from 'double' to 'int' changes value from 5.5 to 5}} 237} 238 239void derived5(C&); // expected-note{{candidate function not viable: cannot bind base class object of type 'A' to derived class reference 'C &' for 1st argument}} 240 241void test_base(A& a) { 242 derived5(a); // expected-error{{no matching function for call to 'derived5}} 243} 244 245// Test reference binding vs. standard conversions. 246int& bind_vs_conv(const double&); 247float& bind_vs_conv(int); 248 249void bind_vs_conv_test() 250{ 251 int& i1 = bind_vs_conv(1.0f); 252 float& f1 = bind_vs_conv((short)1); 253} 254 255// Test that cv-qualifiers get subsumed in the reference binding. 256struct X { }; 257struct Y { }; 258struct Z : X, Y { }; 259 260int& cvqual_subsume(X&); // expected-note{{candidate function}} 261float& cvqual_subsume(const Y&); // expected-note{{candidate function}} 262 263int& cvqual_subsume2(X&); // expected-note{{candidate function}} 264float& cvqual_subsume2(volatile Y&); // expected-note{{candidate function}} 265 266void cvqual_subsume_test(Z z) { 267 cvqual_subsume(z); // expected-error{{call to 'cvqual_subsume' is ambiguous}} 268 cvqual_subsume2(z); // expected-error{{call to 'cvqual_subsume2' is ambiguous}} 269} 270 271// Test overloading with cv-qualification differences in reference 272// binding. 273int& cvqual_diff(X&); 274float& cvqual_diff(const X&); 275 276void cvqual_diff_test(X x, Z z) { 277 int& i1 = cvqual_diff(x); 278 int& i2 = cvqual_diff(z); 279} 280 281// Test overloading with derived-to-base differences in reference 282// binding. 283struct Z2 : Z { }; 284 285int& db_rebind(X&); 286long& db_rebind(Y&); 287float& db_rebind(Z&); 288 289void db_rebind_test(Z2 z2) { 290 float& f1 = db_rebind(z2); 291} 292 293class string { }; 294class opt : public string { }; 295 296struct SR { 297 SR(const string&); 298}; 299 300void f(SR) { } 301 302void g(opt o) { 303 f(o); 304} 305 306 307namespace PR5756 { 308 int &a(void*, int); 309 float &a(void*, float); 310 void b() { 311 int &ir = a(0,0); 312 (void)ir; 313 } 314} 315 316// Tests the exact text used to note the candidates 317namespace test1 { 318 template <class T> void foo(T t, unsigned N); // expected-note {{candidate function [with T = int] not viable: no known conversion from 'const char [6]' to 'unsigned int' for 2nd argument}} 319 void foo(int n, char N); // expected-note {{candidate function not viable: no known conversion from 'const char [6]' to 'char' for 2nd argument}} 320 void foo(int n, const char *s, int t); // expected-note {{candidate function not viable: requires 3 arguments, but 2 were provided}} 321 void foo(int n, const char *s, int t, ...); // expected-note {{candidate function not viable: requires at least 3 arguments, but 2 were provided}} 322 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}} 323 324 // PR 11857 325 void foo(int n); // expected-note {{candidate function not viable: requires single argument 'n', but 2 arguments were provided}} 326 void foo(unsigned n = 10); // expected-note {{candidate function not viable: allows at most single argument 'n', but 2 arguments were provided}} 327 void bar(int n, int u = 0); // expected-note {{candidate function not viable: requires at least argument 'n', but no arguments were provided}} 328 void baz(int n = 0, int u = 0); // expected-note {{candidate function not viable: requires at most 2 arguments, but 3 were provided}} 329 330 void test() { 331 foo(4, "hello"); //expected-error {{no matching function for call to 'foo'}} 332 bar(); //expected-error {{no matching function for call to 'bar'}} 333 baz(3, 4, 5); // expected-error {{no matching function for call to 'baz'}} 334 } 335} 336 337// PR 6014 338namespace test2 { 339 struct QFixed { 340 QFixed(int i); 341 QFixed(long i); 342 }; 343 344 bool operator==(const QFixed &f, int i); 345 346 class qrgb666 { 347 inline operator unsigned int () const; 348 349 inline bool operator==(const qrgb666 &v) const; 350 inline bool operator!=(const qrgb666 &v) const { return !(*this == v); } 351 }; 352} 353 354// PR 6117 355namespace test3 { 356 struct Base {}; 357 struct Incomplete; 358 359 void foo(Base *); // expected-note 2 {{cannot convert argument of incomplete type}} 360 void foo(Base &); // expected-note 2 {{cannot convert argument of incomplete type}} 361 362 void test(Incomplete *P) { 363 foo(P); // expected-error {{no matching function for call to 'foo'}} 364 foo(*P); // expected-error {{no matching function for call to 'foo'}} 365 } 366} 367 368namespace DerivedToBaseVsVoid { 369 struct A { }; 370 struct B : A { }; 371 372 float &f(void *); 373 int &f(const A*); 374 375 void g(B *b) { 376 int &ir = f(b); 377 } 378} 379 380// PR 6398 + PR 6421 381namespace test4 { 382 class A; 383 class B { 384 static void foo(); // expected-note {{not viable}} 385 static void foo(int*); // expected-note {{not viable}} 386 static void foo(long*); // expected-note {{not viable}} 387 388 void bar(A *a) { 389 foo(a); // expected-error {{no matching function for call}} 390 } 391 }; 392} 393 394namespace DerivedToBase { 395 struct A { }; 396 struct B : A { }; 397 struct C : B { }; 398 399 int &f0(const A&); 400 float &f0(B); 401 402 void g() { 403 float &fr = f0(C()); 404 } 405} 406 407namespace PR6483 { 408 struct X0 { 409 operator const unsigned int & () const; 410 }; 411 412 struct X1 { 413 operator unsigned int & () const; 414 }; 415 416 void f0(const bool &); 417 void f1(bool &); // expected-note 2{{not viable}} 418 419 void g(X0 x0, X1 x1) { 420 f0(x0); 421 f1(x0); // expected-error{{no matching function for call}} 422 f0(x1); 423 f1(x1); // expected-error{{no matching function for call}} 424 } 425} 426 427namespace PR6078 { 428 struct A { 429 A(short); // expected-note{{candidate constructor}} 430 A(long); // expected-note{{candidate constructor}} 431 }; 432 struct S { 433 typedef void ft(A); 434 operator ft*(); 435 }; 436 437 void f() { 438 S()(0); // expected-error{{conversion from 'int' to 'PR6078::A' is ambiguous}} 439 } 440} 441 442namespace PR6177 { 443 struct String { String(char const*); }; 444 445 void f(bool const volatile&); 446 int &f(String); 447 448 void g() { int &r = f(""); } 449} 450 451namespace PR7095 { 452 struct X { }; 453 454 struct Y { 455 operator const X*(); 456 457 private: 458 operator X*(); 459 }; 460 461 void f(const X *); 462 void g(Y y) { f(y); } 463} 464 465namespace PR7224 { 466 class A {}; 467 class B : public A {}; 468 469 int &foo(A *const d); 470 float &foo(const A *const d); 471 472 void bar() 473 { 474 B *const d = 0; 475 B const *const d2 = 0; 476 int &ir = foo(d); 477 float &fr = foo(d2); 478 } 479} 480 481namespace NontrivialSubsequence { 482 struct X0; 483 484 class A { 485 operator X0 *(); 486 public: 487 operator const X0 *(); 488 }; 489 490 A a; 491 void foo( void const * ); 492 493 void g() { 494 foo(a); 495 } 496} 497 498// rdar://rdar8499524 499namespace rdar8499524 { 500 struct W {}; 501 struct S { 502 S(...); 503 }; 504 505 void g(const S&); 506 void f() { 507 g(W()); 508 } 509} 510 511namespace rdar9173984 { 512 template <typename T, unsigned long N> int &f(const T (&)[N]); 513 template <typename T> float &f(const T *); 514 515 void test() { 516 int arr[2] = {0, 0}; 517 int *arrp = arr; 518 int &ir = f(arr); 519 float &fr = f(arrp); 520 } 521} 522 523namespace PR9507 { 524 void f(int * const&); // expected-note{{candidate function}} 525 void f(int const(&)[1]); // expected-note{{candidate function}} 526 527 int main() { 528 int n[1]; 529 f(n); // expected-error{{call to 'f' is ambiguous}} 530 } 531} 532 533namespace rdar9803316 { 534 void foo(float); 535 int &foo(int); 536 537 void bar() { 538 int &ir = (&foo)(0); 539 } 540} 541 542namespace IncompleteArg { 543 // Ensure that overload resolution attempts to complete argument types when 544 // performing ADL. 545 template<typename T> struct S { 546 friend int f(const S&); 547 }; 548 extern S<int> s; 549 int k = f(s); 550 551 template<typename T> struct Op { 552 friend bool operator==(const Op &, const Op &); 553 }; 554 extern Op<char> op; 555 bool b = op == op; 556 557 // ... and not in other cases! Nothing here requires U<int()> to be complete. 558 // (Note that instantiating U<int()> will fail.) 559 template<typename T> struct U { 560 T t; 561 }; 562 struct Consumer { 563 template<typename T> 564 int operator()(const U<T> &); 565 }; 566 template<typename T> U<T> &make(); 567 Consumer c; 568 int n = sizeof(c(make<int()>())); 569} 570 571namespace PR12142 { 572 void fun(int (*x)[10]); // expected-note{{candidate function not viable: 1st argument ('const int (*)[10]') would lose const qualifier}} 573 void g() { fun((const int(*)[10])0); } // expected-error{{no matching function for call to 'fun'}} 574} 575 576// DR1152: Take 'volatile' into account when handling reference bindings in 577// overload resolution. 578namespace PR12931 { 579 void f(const int &, ...); 580 void f(const volatile int &, int); 581 void g() { f(0, 0); } 582} 583