libstdc++-v3/testsuite/21_strings/basic_string/hash/hash.cc

   1 // Copyright (C) 2019-2020 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 run { target c++17 } }
  20
  21 #include <string>
  22 #include <memory_resource>
  23 #include <testsuite_hooks.h>
  24
  25 // C++17 24.3.5 [basic.string.hash]
  26 // If S is one of these string types, SV is the corresponding string view type,
  27 // and s is an object of type S, then hash<S>()(s) == hash<SV>()(SV(s)).
  28
  29 template<typename S>
  30   bool
  31   test(const S& s)
  32   {
  33     using std::hash;
  34     using SV = std::basic_string_view<typename S::value_type>;
  35     return hash<S>()(s) == hash<SV>()(SV(s));
  36   }
  37
  38 void
  39 test01()
  40 {
  41   VERIFY( test(std::string("a narrow string")) );
  42   VERIFY( test(std::u16string(u"a utf-16 string")) );
  43   VERIFY( test(std::u32string(U"a utf-32 string")) );
  44 #if _GLIBCXX_USE_WCHAR_T
  45   VERIFY( test(std::wstring(L"a wide string")) );
  46 #endif
  47 }
  48
  49 void
  50 test02()
  51 {
  52 #if _GLIBCXX_USE_CXX11_ABI
  53   VERIFY( test(std::pmr::string("a narrow string, but with PMR!")) );
  54   VERIFY( test(std::pmr::u16string(u"a utf-16 string, but with PMR!")) );
  55   VERIFY( test(std::pmr::u32string(U"a utf-32 string, but with PMR!")) );
  56 #if _GLIBCXX_USE_WCHAR_T
  57   VERIFY( test(std::pmr::wstring(L"a wide string, but with PMR!")) );
  58 #endif
  59 #endif
  60 }
  61
  62 int
  63 main()
  64 {
  65   test01();
  66   test02();
  67 }