memcheck/tests/cxx17_aligned_new.cpp

   1 // See
   2 // https://en.cppreference.com/w/cpp/memory/new/operator_new
   3 // and
   4 // https://en.cppreference.com/w/cpp/memory/new/operator_delete
   5
   6 // Some of these are only used in very special circumstances
   7 // so rather then using new and delete expressions most calls
   8 // here directly call the operators
   9
  10 #include <cstdlib>
  11 #include <new>
  12 #include <iostream>
  13
  14 class alignas(64) MyClass {
  15 public:
  16     int i;
  17 };
  18
  19 class OrdinaryClass {
  20 public:
  21     int i;
  22 };
  23
  24 int main() {
  25     // THROWING
  26     // plain versions
  27     // cppreference new number 1
  28     OrdinaryClass* oClass = new OrdinaryClass();
  29     // cppreference delete number 1
  30     operator delete(oClass);
  31
  32     // cppreference new number 2
  33     OrdinaryClass* oClass5 = new OrdinaryClass[5];
  34     // cppreference delete number 2
  35     operator delete[](oClass5);
  36
  37     // aligned versions
  38     // cppreference new number 3
  39     MyClass* myClass = new MyClass();
  40     // cppreference delete number 3
  41     operator delete(myClass, std::align_val_t(64U));
  42
  43     // cppreference new number 4
  44     MyClass* myClass5 = new MyClass[5];
  45     // cppreference delete number 4
  46     operator delete[](myClass5, std::align_val_t(64U));
  47
  48     // sized versions
  49     oClass = new OrdinaryClass();
  50     // cppreference delete number 5
  51     operator delete(oClass, sizeof(OrdinaryClass));
  52
  53     oClass5 = new OrdinaryClass[5];
  54     // cppreference delete number 6
  55     operator delete[](oClass5, sizeof(OrdinaryClass)*5);
  56
  57     // sized aligned versions
  58     myClass = new MyClass();
  59     // cppreference delete number 7
  60     operator delete(myClass, sizeof(*myClass), std::align_val_t(64U));
  61
  62     myClass5 = new MyClass[5];
  63     // cppreference delete number 8
  64     operator delete [](myClass5, sizeof(*myClass)*5, std::align_val_t(64U));
  65
  66     // NOTHROW
  67
  68     // cppreference new number 5
  69     oClass = new (std::nothrow) OrdinaryClass;
  70     delete oClass;
  71
  72     // cppreference new number 6
  73     oClass5 = new (std::nothrow) OrdinaryClass[5];
  74     delete [] oClass5;
  75
  76     // cppreference new number 7
  77     myClass = new (std::nothrow) MyClass;
  78     delete myClass;
  79
  80     // cppreference new number 8
  81     myClass5 = new (std::nothrow) MyClass[5];
  82     delete [] myClass5;
  83 }
  84