clang/test/SemaCXX/complex-overload.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 char *foo(float);
   3
   4 void test_foo_1(float fv, double dv, float _Complex fc, double _Complex dc) {
   5   char *cp1 = foo(fv);
   6   char *cp2 = foo(dv);
   7   // Note: GCC and EDG reject these two, they are valid C99 conversions but
   8   // shouldn't be accepted in C++ because the result is surprising.
   9   char *cp3 = foo(fc); // expected-error {{implicit conversion from '_Complex float' to 'float' is not permitted in C++}}
  10   char *cp4 = foo(dc); // expected-error {{implicit conversion from '_Complex double' to 'float' is not permitted in C++}}
  11 }
  12
  13 int *foo(float _Complex);
  14
  15 void test_foo_2(float fv, double dv, float _Complex fc, double _Complex dc) {
  16   char *cp1 = foo(fv);
  17   char *cp2 = foo(dv);
  18   int *ip = foo(fc);
  19   int *lp = foo(dc);
  20 }
  21
  22 long *foo(double _Complex);
  23
  24 void test_foo_3(float fv, double dv, float _Complex fc, double _Complex dc) {
  25   char *cp1 = foo(fv);
  26   char *cp2 = foo(dv);
  27   int *ip = foo(fc);
  28   long *lp = foo(dc);
  29 }
  30
  31 char *promote_or_convert(double _Complex);  // expected-note{{candidate function}}
  32 int *promote_or_convert(long double _Complex); // expected-note{{candidate function}}
  33
  34 void test_promote_or_convert(float f, float _Complex fc) {
  35   char *cp = promote_or_convert(fc);
  36   int *ip2 = promote_or_convert(f); // expected-error{{call to 'promote_or_convert' is ambiguous}}
  37 }
  38
  39 char *promote_or_convert2(float);
  40 int *promote_or_convert2(double _Complex);
  41
  42 void test_promote_or_convert2(float _Complex fc) {
  43   int *cp = promote_or_convert2(fc);
  44 }
  45
  46 char *promote_or_convert3(int _Complex); // expected-note {{candidate}}
  47 int *promote_or_convert3(long _Complex); // expected-note {{candidate}}
  48
  49 void test_promote_or_convert3(short _Complex sc) {
  50   char *cp1 = promote_or_convert3(sc);
  51   char *cp2 = promote_or_convert3(1i);
  52   int *cp3 = promote_or_convert3(1il);
  53   int *cp4 = promote_or_convert3(1ill); // expected-error {{ambiguous}}
  54 }
  55
  56 char &convert4(short _Complex);
  57 char &test_convert4 = convert4(1i);