libstdc++-v3/testsuite/21_strings/basic_string_view/operations/compare/char/70483.cc

   1 // Copyright (C) 2017-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do compile { target c++17 } }
  20
  21 #include <string_view>
  22
  23 struct constexpr_char_traits : std::char_traits<char>
  24 {
  25   static constexpr size_t
  26   length(const char* val)
  27   {
  28     size_t res = 0;
  29     for (; val[res] != '\0'; ++res)
  30       ;
  31     return res;
  32   }
  33
  34   static constexpr int
  35   compare(const char* lhs, const char* rhs, std::size_t count)
  36   {
  37     for (size_t pos = 0; pos < count; ++pos)
  38     {
  39       if (lhs[pos] != rhs[pos])
  40         return lhs[pos] - rhs[pos];
  41     }
  42     return 0;
  43   }
  44 };
  45
  46 using string_view = std::basic_string_view<char, constexpr_char_traits>;
  47
  48 constexpr
  49 string_view get()
  50 {
  51     string_view res = "x::";
  52     string_view start_pattern = "x";
  53     res = res.substr(res.find(start_pattern) + start_pattern.size());
  54     res = res.substr(0, res.find_first_of(";]"));
  55     res = res.substr(res.rfind("::"));
  56     return res;
  57 }
  58
  59 static_assert( get() == get() );
  60
  61 #ifdef _GLIBCXX_USE_CHAR8_T
  62 using std::u8string_view;
  63 #else
  64 using u8string_view = std::basic_string_view<char>;
  65 #endif
  66
  67 constexpr
  68 u8string_view get8()
  69 {
  70     u8string_view res = u8"x::";
  71     u8string_view start_pattern = u8"x";
  72     res = res.substr(res.find(start_pattern) + start_pattern.size());
  73     res = res.substr(0, res.find_first_of(u8";]"));
  74     res = res.substr(res.rfind(u8"::"));
  75     return res;
  76 }
  77
  78 static_assert( get8() == get8() );
  79
  80 using std::u16string_view;
  81
  82 constexpr
  83 u16string_view get16()
  84 {
  85     u16string_view res = u"x::";
  86     u16string_view start_pattern = u"x";
  87     res = res.substr(res.find(start_pattern) + start_pattern.size());
  88     res = res.substr(0, res.find_first_of(u";]"));
  89     res = res.substr(res.rfind(u"::"));
  90     return res;
  91 }
  92
  93 static_assert( get16() == get16() );
  94
  95 using std::u32string_view;
  96
  97 constexpr
  98 u32string_view get32()
  99 {
 100     u32string_view res = U"x::";
 101     u32string_view start_pattern = U"x";
 102     res = res.substr(res.find(start_pattern) + start_pattern.size());
 103     res = res.substr(0, res.find_first_of(U";]"));
 104     res = res.substr(res.rfind(U"::"));
 105     return res;
 106 }
 107
 108 static_assert( get32() == get32() );