28ddb91dec
This unfortunately results in a substantial breaking change when switching to C++20, but it's not yet clear what / how much we should do about that. We may want to add a compatibility conversion from u8 string literals to const char*, similar to how C++98 provided a compatibility conversion from string literals to non-const char*, but that's not handled by this patch. The feature can be disabled in C++20 mode with -fno-char8_t. llvm-svn: 346892
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
// RUN: %clang_cc1 -fchar8_t -std=c++17 -verify %s
|
|
// RUN: %clang_cc1 -std=c++2a -verify %s
|
|
|
|
char8_t a = u8'a';
|
|
char8_t b[] = u8"foo";
|
|
char8_t c = 'a';
|
|
char8_t d[] = "foo"; // expected-error {{initializing 'char8_t' array with plain string literal}} expected-note {{add 'u8' prefix}}
|
|
|
|
char e = u8'a';
|
|
char f[] = u8"foo";
|
|
#if __cplusplus <= 201703L
|
|
// expected-error@-2 {{initialization of char array with UTF-8 string literal is not permitted by '-fchar8_t'}}
|
|
#else
|
|
// expected-error@-4 {{ISO C++20 does not permit initialization of char array with UTF-8 string literal}}
|
|
#endif
|
|
char g = 'a';
|
|
char h[] = "foo";
|
|
|
|
void disambig() {
|
|
char8_t (a) = u8'x';
|
|
}
|
|
|
|
void operator""_a(char);
|
|
void operator""_a(const char*, decltype(sizeof(0)));
|
|
|
|
void test_udl1() {
|
|
int &x = u8'a'_a; // expected-error {{no matching literal operator}}
|
|
float &y = u8"a"_a; // expected-error {{no matching literal operator}}
|
|
}
|
|
|
|
int &operator""_a(char8_t);
|
|
float &operator""_a(const char8_t*, decltype(sizeof(0)));
|
|
|
|
void test_udl2() {
|
|
int &x = u8'a'_a;
|
|
float &y = u8"a"_a;
|
|
}
|
|
|
|
template<typename E, typename T> void check(T &&t) {
|
|
using Check = E;
|
|
using Check = T;
|
|
}
|
|
void check_deduction() {
|
|
check<char8_t>(u8'a');
|
|
check<const char8_t(&)[5]>(u8"a\u1000");
|
|
}
|
|
|
|
static_assert(sizeof(char8_t) == 1);
|
|
static_assert(char8_t(-1) > 0);
|
|
static_assert(u8"\u0080"[0] > 0);
|