clang/test/SemaCXX/char8_t.cpp

   1 // RUN: %clang_cc1 -fchar8_t -std=c++17 -verify %s
   2 // RUN: %clang_cc1 -std=c++2a -verify %s
   3
   4 char8_t a = u8'a';
   5 char8_t b[] = u8"foo";
   6 char8_t c = 'a';
   7 char8_t d[] = "foo"; // expected-error {{initializing 'char8_t' array with plain string literal}} expected-note {{add 'u8' prefix}}
   8
   9 char e = u8'a';
  10 char f[] = u8"foo";
  11 #if __cplusplus <= 201703L
  12 // expected-error@-2 {{initialization of char array with UTF-8 string literal is not permitted by '-fchar8_t'}}
  13 #else
  14 // expected-error@-4 {{ISO C++20 does not permit initialization of char array with UTF-8 string literal}}
  15 #endif
  16 char g = 'a';
  17 char h[] = "foo";
  18
  19 void disambig() {
  20   char8_t (a) = u8'x';
  21 }
  22
  23 void operator""_a(char);
  24 void operator""_a(const char*, decltype(sizeof(0)));
  25
  26 void test_udl1() {
  27   int &x = u8'a'_a; // expected-error {{no matching literal operator}}
  28   float &y = u8"a"_a; // expected-error {{no matching literal operator}}
  29 }
  30
  31 int &operator""_a(char8_t);
  32 float &operator""_a(const char8_t*, decltype(sizeof(0)));
  33
  34 void test_udl2() {
  35   int &x = u8'a'_a;
  36   float &y = u8"a"_a;
  37 }
  38
  39 template<typename E, typename T> void check(T &&t) {
  40   using Check = E;
  41   using Check = T;
  42 }
  43 void check_deduction() {
  44   check<char8_t>(u8'a');
  45   check<const char8_t(&)[5]>(u8"a\u1000");
  46 }
  47
  48 static_assert(sizeof(char8_t) == 1);
  49 static_assert(char8_t(-1) > 0);
  50 static_assert(u8"\u0080"[0] > 0);