libstdc++-v3/testsuite/23_containers/vector/capacity/87544.cc

   1 // Copyright (C) 2018-2025 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 "-O2" }
  19 // { dg-do compile { target c++11 } }
  20
  21 #include <cstdlib>
  22 #include <vector>
  23
  24 template<class T>
  25 struct Alloc : public std::allocator<T>
  26 {
  27   template<class U>
  28     struct rebind { typedef Alloc<U> other; };
  29
  30   Alloc() : std::allocator<T>() {}
  31
  32   template<class U>
  33     Alloc(const Alloc<U>& other) : std::allocator<T>(other) {}
  34
  35   T* allocate(std::size_t num, const void* = 0)
  36   {
  37     std::size_t size = num * sizeof(T);
  38     void *result = std::malloc(size);
  39     if(size>16 && (std::size_t(result) & 15)!=0) {
  40       std::free(result);
  41       return 0;
  42     }
  43     return static_cast<T*>( result );
  44   }
  45
  46   void deallocate(T* p, std::size_t) { std::free(p); }
  47 };
  48
  49 unsigned f(std::vector<int, Alloc<int> >& v)
  50 {
  51   v.push_back(1);
  52   return v.size();
  53 }
  54
  55 template<class T>
  56 struct Alloc2 : public Alloc<T>
  57 {
  58   template<class U>
  59     struct rebind { typedef Alloc2<U> other; };
  60
  61   Alloc2() : Alloc<T>() {}
  62
  63   template<class U>
  64     Alloc2(const Alloc2<U>& other) : Alloc<T>(other) {}
  65
  66   std::size_t max_size() const { return std::size_t(-1) / sizeof(T); }
  67 };
  68
  69 unsigned g(std::vector<int, Alloc2<int> >& v)
  70 {
  71   v.push_back(1);
  72   return v.size();
  73 }