libstdc++-v3/testsuite/21_strings/basic_string/cons/char/deduction.cc

   1 // Copyright (C) 2017 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>
  22 #include <testsuite_iterators.h>
  23
  24 template<typename C>
  25   using input_iterator_seq
  26     = __gnu_test::test_container<C, __gnu_test::input_iterator_wrapper>;
  27
  28 template<typename T, typename U> struct require_same;
  29 template<typename T> struct require_same<T, T> { using type = void; };
  30
  31 template<typename T, typename U>
  32   typename require_same<T, U>::type
  33   check_type(U&) { }
  34
  35 void
  36 test01()
  37 {
  38   std::string s0;
  39   std::allocator<char> a;
  40
  41   std::basic_string s1 = s0;
  42   check_type<std::string>(s1);
  43
  44   std::basic_string s2 = std::move(s0);
  45   check_type<std::string>(s2);
  46
  47   const std::basic_string s3 = s0;
  48   check_type<const std::string>(s3);
  49
  50   const std::basic_string s4 = s3;
  51   check_type<const std::string>(s4);
  52
  53 #if _GLIBCXX_USE_CXX11_ABI
  54   std::basic_string s5(s0, a);
  55   check_type<std::string>(s5);
  56
  57   std::basic_string s6(std::move(s0), a);
  58   check_type<std::string>(s6);
  59 #endif
  60
  61   std::basic_string s7(s0, 0, 0);
  62   check_type<std::string>(s7);
  63 }
  64
  65 void
  66 test02()
  67 {
  68   char a[1] = {};
  69   input_iterator_seq<char> seq(a);
  70
  71   std::basic_string s1(seq.begin(), seq.end());
  72   check_type<std::string>(s1);
  73
  74   std::basic_string s2(seq.begin(), seq.end(), std::allocator<char>());
  75   check_type<std::string>(s2);
  76
  77   std::basic_string s3((char)1, 'a');
  78   check_type<std::string>(s3);
  79
  80   std::basic_string s4((char)1, 'a', std::allocator<char>());
  81   check_type<std::string>(s4);
  82 }
  83
  84 void
  85 test03()
  86 {
  87   char16_t a[1] = {};
  88   input_iterator_seq<char16_t> seq(a);
  89
  90   std::basic_string s1(seq.begin(), seq.end());
  91   check_type<std::u16string>(s1);
  92
  93   std::basic_string s2(seq.begin(), seq.end(), std::allocator<char16_t>());
  94   check_type<std::u16string>(s2);
  95
  96   std::basic_string s3((char16_t)1, u'a');
  97   check_type<std::u16string>(s3);
  98
  99   std::basic_string s4((char16_t)1, u'a', std::allocator<char16_t>());
 100   check_type<std::u16string>(s4);
 101 }
 102
 103 void
 104 test04()
 105 {
 106   char32_t a[1] = {};
 107   input_iterator_seq<char32_t> seq(a);
 108
 109   std::basic_string s1(seq.begin(), seq.end());
 110   check_type<std::u32string>(s1);
 111
 112   std::basic_string s2(seq.begin(), seq.end(), std::allocator<char32_t>());
 113   check_type<std::u32string>(s2);
 114
 115   std::basic_string s3((char32_t)1, U'a');
 116   check_type<std::u32string>(s3);
 117
 118   std::basic_string s4((char32_t)1, U'a', std::allocator<char32_t>());
 119   check_type<std::u32string>(s4);
 120 }