clang/test/CXX/lex/lex.literal/lex.ext/p8.cpp

   1 // RUN: %clang_cc1 -std=c++11 -verify %s
   2
   3 using size_t = decltype(sizeof(int));
   4 constexpr const char *operator "" _id(const char *p, size_t) { return p; }
   5 constexpr const char *s = "foo"_id "bar" "baz"_id "quux";
   6
   7 constexpr bool streq(const char *p, const char *q) {
   8   return *p == *q && (!*p || streq(p+1, q+1));
   9 }
  10 static_assert(streq(s, "foobarbazquux"), "");
  11
  12 constexpr const char *operator "" _trim(const char *p, size_t n) {
  13   return *p == ' ' ? operator "" _trim(p + 1, n - 1) : p;
  14 }
  15 constexpr const char *t = "   " " "_trim "  foo";
  16 static_assert(streq(t, "foo"), "");
  17
  18 const char *u = "foo" "bar"_id "baz" "quux"_di "corge"; // expected-error {{differing user-defined suffixes ('_id' and '_di') in string literal concatenation}}