d0d2772379
Implement P2513 This change allows initializing an array of unsigned char, or char from u8 string literals. This was done both to support legacy code and for compatibility with C where char8_t will be typedef to unsigned char. This is backported to C++20 as per WG21 guidance. Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D136449
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
// RUN: %clang_cc1 -fchar8_t -std=c++17 -verify %s
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// RUN: %clang_cc1 -std=c++2a -verify=expected %s
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// RUN: %clang_cc1 -std=c++2a -verify=expected -fno-signed-char %s
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char8_t a = u8'a';
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char8_t b[] = u8"foo";
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char8_t c = 'a';
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char8_t d[] = "foo"; // expected-error {{initializing 'char8_t' array with plain string literal}} expected-note {{add 'u8' prefix}}
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char e = u8'a';
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char g = 'a';
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char h[] = "foo";
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unsigned char i[] = u8"foo";
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unsigned char j[] = { u8"foo" };
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char k[] = u8"foo";
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char l[] = { u8"foo" };
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signed char m[] = u8"foo"; // expected-error {{initialization of char array with UTF-8 string literal is not permitted}}
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signed char n[] = { u8"foo" }; // expected-error {{cannot initialize an array element of type 'signed char' with an lvalue of type 'const char8_t[4]'}}
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const unsigned char* uptr = u8"foo"; // expected-error {{cannot initialize}}
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const signed char* sptr = u8"foo"; // expected-error {{cannot initialize}}
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const char* ptr = u8"foo"; // expected-error {{cannot initialize}}
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template <typename T>
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void check_values() {
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constexpr T c[] = {0, static_cast<T>(0xFF), 0x42};
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constexpr T a[] = u8"\x00\xFF\x42";
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static_assert(a[0] == c[0]);
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static_assert(a[1] == c[1]);
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static_assert(a[2] == c[2]);
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}
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void call_check_values() {
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check_values<char>();
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check_values<unsigned char>();
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}
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void disambig() {
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char8_t (a) = u8'x';
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}
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void operator""_a(char);
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void operator""_a(const char*, decltype(sizeof(0)));
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void test_udl1() {
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int &x = u8'a'_a; // expected-error {{no matching literal operator}}
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float &y = u8"a"_a; // expected-error {{no matching literal operator}}
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}
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int &operator""_a(char8_t);
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float &operator""_a(const char8_t*, decltype(sizeof(0)));
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void test_udl2() {
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int &x = u8'a'_a;
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float &y = u8"a"_a;
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}
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template<typename E, typename T> void check(T &&t) {
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using Check = E;
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using Check = T;
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}
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void check_deduction() {
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check<char8_t>(u8'a');
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check<const char8_t(&)[5]>(u8"a\u1000");
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}
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static_assert(sizeof(char8_t) == 1);
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static_assert(char8_t(-1) > 0);
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static_assert(u8"\u0080"[0] > 0);
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namespace ambiguous {
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struct A {
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char8_t s[10];
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};
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struct B {
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char s[10];
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};
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void f(A); // expected-note {{candidate}}
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void f(B); // expected-note {{candidate}}
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int test() {
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f({u8"foo"}); // expected-error {{call to 'f' is ambiguous}}
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}
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}
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