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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 //   constexpr bool operator>=(const charT* lhs, basic_string_wiew<charT,traits> rhs);
     14 // template<class charT, class traits, class Allocator>
     15 //   constexpr bool operator>=(basic_string_wiew<charT,traits> lhs, const charT* rhs);
     16 
     17 #include <experimental/string_view>
     18 #include <cassert>
     19 
     20 #include "constexpr_char_traits.hpp"
     21 
     22 template <class S>
     23 void
     24 test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
     25 {
     26     assert((lhs >= rhs) == x);
     27     assert((rhs >= lhs) == y);
     28 }
     29 
     30 int main()
     31 {
     32     {
     33     typedef std::experimental::string_view S;
     34     test("", S(""), true, true);
     35     test("", S("abcde"), false, true);
     36     test("", S("abcdefghij"), false, true);
     37     test("", S("abcdefghijklmnopqrst"), false, true);
     38     test("abcde", S(""), true, false);
     39     test("abcde", S("abcde"), true, true);
     40     test("abcde", S("abcdefghij"), false, true);
     41     test("abcde", S("abcdefghijklmnopqrst"), false, true);
     42     test("abcdefghij", S(""), true, false);
     43     test("abcdefghij", S("abcde"), true, false);
     44     test("abcdefghij", S("abcdefghij"), true, true);
     45     test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
     46     test("abcdefghijklmnopqrst", S(""), true, false);
     47     test("abcdefghijklmnopqrst", S("abcde"), true, false);
     48     test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
     49     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
     50     }
     51 
     52 #if _LIBCPP_STD_VER > 11
     53     {
     54     typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
     55     constexpr SV  sv1;
     56     constexpr SV  sv2 { "abcde", 5 };
     57 
     58     static_assert (  sv1     >= "", "" );
     59     static_assert (  ""      >= sv1, "" );
     60     static_assert (!(sv1     >= "abcde"), "" );
     61     static_assert (  "abcde" >= sv1, "" );
     62 
     63     static_assert (  sv2      >= "", "" );
     64     static_assert (!(""       >= sv2), "" );
     65     static_assert (  sv2      >= "abcde", "" );
     66     static_assert (  "abcde"  >= sv2, "" );
     67     static_assert (!(sv2      >= "abcde0"), "" );
     68     static_assert (  "abcde0" >= sv2, "" );
     69     }
     70 #endif
     71 }
     72