libstdc++-v3/testsuite/23_containers/deque/capacity/max_size.cc

   1 // Copyright (C) 2018-2024 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-do run }
  19
  20 #include <deque>
  21 #include <stdexcept>
  22 #include <limits>
  23 #include <testsuite_hooks.h>
  24
  25 typedef std::deque<char> test_type;
  26
  27 typedef test_type::size_type size_type;
  28 typedef test_type::difference_type difference_type;
  29
  30 const difference_type diffmax = std::numeric_limits<difference_type>::max();
  31
  32 void
  33 test01()
  34 {
  35   test_type v;
  36   VERIFY( v.max_size() <= diffmax );
  37 }
  38
  39 void
  40 test02()
  41 {
  42   size_type n = size_type(diffmax) + 1;
  43   VERIFY( n > test_type().max_size() );
  44
  45   try {
  46     test_type v(n);
  47     VERIFY( false );
  48   } catch (const std::length_error&) { }
  49
  50   try {
  51     test_type v(n, 'x');
  52     VERIFY( false );
  53   } catch (const std::length_error&) { }
  54
  55   try {
  56     test_type v(n, 'x', test_type::allocator_type());
  57     VERIFY( false );
  58   } catch (const std::length_error&) { }
  59 }
  60
  61 #ifdef __GLIBCXX_TYPE_INT_N_0
  62 template<typename T, typename U, bool = (sizeof(T) > sizeof(long long))>
  63   struct Base_
  64   {
  65     typedef T difference_type;
  66     typedef U size_type;
  67   };
  68
  69 template<typename T, typename U>
  70   struct Base_<T, U, false>
  71   {
  72     typedef long long difference_type;
  73     typedef unsigned long long size_type;
  74   };
  75
  76 typedef Base_<__GLIBCXX_TYPE_INT_N_0, unsigned __GLIBCXX_TYPE_INT_N_0> Base;
  77 #else
  78 struct Base
  79 {
  80   typedef long long difference_type;
  81   typedef unsigned long long size_type;
  82 };
  83 #endif
  84
  85 // An iterator with a difference_type larger than ptrdiff_t
  86 struct Iter : Base
  87 {
  88   typedef std::random_access_iterator_tag iterator_category;
  89   typedef char value_type;
  90   typedef const char* pointer;
  91   typedef const char& reference;
  92   using Base::difference_type;
  93
  94   Iter() : n(0) { }
  95   Iter(size_type n) : n(n) { }
  96
  97   reference operator*() const { return value; }
  98   pointer operator->() const { return &value; }
  99
 100   Iter& operator++() { ++n; return *this; }
 101   Iter operator++(int) { Iter tmp(*this); ++n; return tmp; }
 102   Iter& operator--() { --n; return *this; }
 103   Iter operator--(int) { Iter tmp(*this); --n; return tmp; }
 104
 105   Iter& operator+=(difference_type d) { n += d; return *this; }
 106   Iter& operator-=(difference_type d) { n -= d; return *this; }
 107
 108   difference_type operator-(const Iter& rhs) const { return n - rhs.n; }
 109
 110   reference operator[](difference_type d) const { return value; }
 111
 112   bool operator==(const Iter& rhs) const { return n == rhs.n; }
 113   bool operator!=(const Iter& rhs) const { return n != rhs.n; }
 114   bool operator<(const Iter& rhs) const { return n < rhs.n; }
 115   bool operator>(const Iter& rhs) const { return n > rhs.n; }
 116   bool operator<=(const Iter& rhs) const { return n <= rhs.n; }
 117   bool operator>=(const Iter& rhs) const { return n >= rhs.n; }
 118
 119 private:
 120   size_type n;
 121   static const char value = 'x';
 122 };
 123
 124 const char Iter::value;
 125
 126 Iter operator+(Iter i, Iter::difference_type n) { return i += n; }
 127 Iter operator+(Iter::difference_type n, Iter i) { return i += n; }
 128 Iter operator-(Iter::difference_type n, Iter i) { return i -= n; }
 129
 130 void
 131 test03()
 132 {
 133   Iter first, last(Iter::size_type(diffmax) + 1);
 134   VERIFY( std::distance(first, last) > test_type().max_size() );
 135
 136   try {
 137     test_type vec(first, last);
 138     VERIFY(false);
 139   } catch (const std::length_error&) { }
 140 }
 141
 142 int
 143 main()
 144 {
 145   test01();
 146   test02();
 147   test03();
 148 }