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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <string>
     11 
     12 // template<class charT, class traits, class Allocator>
     13 //   basic_string<charT,traits,Allocator>
     14 //   operator+(const charT* lhs, const basic_string<charT,traits,Allocator>& rhs);
     15 
     16 // template<class charT, class traits, class Allocator>
     17 //   basic_string<charT,traits,Allocator>&&
     18 //   operator+(const charT* lhs, basic_string<charT,traits,Allocator>&& rhs);
     19 
     20 #include <string>
     21 #include <cassert>
     22 
     23 template <class S>
     24 void
     25 test0(const typename S::value_type* lhs, const S& rhs, const S& x)
     26 {
     27     assert(lhs + rhs == x);
     28 }
     29 
     30 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     31 
     32 template <class S>
     33 void
     34 test1(const typename S::value_type* lhs, S&& rhs, const S& x)
     35 {
     36     assert(lhs + move(rhs) == x);
     37 }
     38 
     39 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     40 
     41 typedef std::string S;
     42 
     43 int main()
     44 {
     45     test0("", S(""), S(""));
     46     test0("", S("12345"), S("12345"));
     47     test0("", S("1234567890"), S("1234567890"));
     48     test0("", S("12345678901234567890"), S("12345678901234567890"));
     49     test0("abcde", S(""), S("abcde"));
     50     test0("abcde", S("12345"), S("abcde12345"));
     51     test0("abcde", S("1234567890"), S("abcde1234567890"));
     52     test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
     53     test0("abcdefghij", S(""), S("abcdefghij"));
     54     test0("abcdefghij", S("12345"), S("abcdefghij12345"));
     55     test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
     56     test0("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
     57     test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
     58     test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
     59     test0("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
     60     test0("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
     61 
     62 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     63 
     64     test1("", S(""), S(""));
     65     test1("", S("12345"), S("12345"));
     66     test1("", S("1234567890"), S("1234567890"));
     67     test1("", S("12345678901234567890"), S("12345678901234567890"));
     68     test1("abcde", S(""), S("abcde"));
     69     test1("abcde", S("12345"), S("abcde12345"));
     70     test1("abcde", S("1234567890"), S("abcde1234567890"));
     71     test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
     72     test1("abcdefghij", S(""), S("abcdefghij"));
     73     test1("abcdefghij", S("12345"), S("abcdefghij12345"));
     74     test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
     75     test1("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
     76     test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
     77     test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
     78     test1("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
     79     test1("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
     80 
     81 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     82 }
     83