1 // RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify
2
3 template <int N> struct Str {
StrStr4 constexpr Str(char const (&s)[N]) { __builtin_memcpy(value, s, N); }
5 char value[N];
6 };
7
8 template <Str V> class ASCII {};
9
10 void Foo(ASCII<"this nontype template argument is too long to print">); // expected-note {{no known conversion from 'ASCII<Str<43>{"this nontype template argument is too long"}>' to 'ASCII<Str<52>{"this nontype template argument is too long to print"}>'}}
11 void Bar(ASCII<"this nttp argument is too short">); // expected-note {{no known conversion from 'ASCII<Str<14>{{119, 97, 105, 116, 32, 97, 32, 115, 27, 99, 111, 110, 100, 0}}>' to 'ASCII<Str<32>{"this nttp argument is too short"}>'}}
12 void Meow(ASCII<"what|">); // expected-note {{no known conversion from 'ASCII<Str<8>{"what??!"}>' to 'ASCII<Str<6>{"what|"}>' for 1st argument}}
13
test_ascii()14 void test_ascii() {
15 ASCII<"this nontype template argument"
16 " is too long">
17 a;
18 Foo(a); // expected-error {{no matching function}}
19 decltype(a)::display(); // expected-error {{no member named 'display' in 'ASCII<Str<43>{"this nontype template argument is [...]"}>'}}
20 }
21
test_non_ascii()22 void test_non_ascii() {
23 ASCII<"wait a s\033cond"> a;
24 Bar(a); // expected-error {{no matching function}}
25 decltype(a)::display(); // expected-error {{no member named 'display' in 'ASCII<Str<14>{{119, 97, 105, 116, 32, 97, 32, 115, 27, 99, ...}}>'}}
26 }
27
28 // The dialects (C++20 and above) that accept string literals as non-type
29 // template arguments do not support trigraphs.
test_trigraph()30 void test_trigraph() {
31 ASCII<"what??!"> a; // expected-warning {{trigraph ignored}}
32 Meow(a); // expected-error {{no matching function}}
33 decltype(a)::display(); // expected-error {{no member named 'display' in 'ASCII<Str<8>{"what??!"}>'}}
34 }
35