1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s -triple=x86_64-linux-gnu
2 
3 using size_t = decltype(sizeof(int));
4 namespace std {
5   struct string {};
6 }
7 
8 template<typename T, typename U> struct same_type;
9 template<typename T> struct same_type<T, T> {};
10 
11 namespace std_example {
12 
13 long double operator "" _w(long double);
14 std::string operator "" _w(const char16_t*, size_t);
15 unsigned operator "" _w(const char*);
16 int main() {
17   auto v1 = 1.2_w;    // calls operator "" _w(1.2L)
18   auto v2 = u"one"_w; // calls operator "" _w(u"one", 3)
19   auto v3 = 12_w;     // calls operator "" _w("12")
20   "two"_w;            // expected-error {{no matching literal operator for call to 'operator "" _w' with arguments of types 'const char *' and 'unsigned long'}}
21 
22   same_type<decltype(v1), long double> test1;
23   same_type<decltype(v2), std::string> test2;
24   same_type<decltype(v3), unsigned> test3;
25 }
26 
27 }
28