libstdc++-v3/testsuite/libstdc++-prettyprinters/compat.cc

// { dg-options "-g -O0" }
// { dg-do run { target c++11 } }

// Copyright (C) 2014-2026 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// Test that current printers still support old definitions of types.

namespace std
{
  template<typename T>
    struct _Head_base : T
    { };

  template<typename T>
    struct _Head_base<T*>
    {
      T* _M_head_impl;
    };

  template<unsigned long, typename ...> struct _Tuple_impl;

  template<typename T, typename U>
    struct _Tuple_impl<0, T, U> : _Tuple_impl<1, U>, _Head_base<T>
    { };

  template<typename U>
    struct _Tuple_impl<1, U> : _Head_base<U>
    { };

  template<typename T, typename U>
    struct tuple : _Tuple_impl<0, T, U>
    { };

  template<typename T> struct default_delete { };

  template<typename T, typename D = default_delete<T>>
    struct unique_ptr
    {
      unique_ptr(T* p) { _M_t._M_head_impl = p; }

      using __tuple_type = tuple<T*, D>;

      __tuple_type _M_t;
    };

  // Old representation of std::optional, before GCC 9
  template<typename T>
    struct _Optional_payload
    {
      _Optional_payload() : _M_empty(), _M_engaged(false) { }
      struct _Empty_byte { };
      union {
	_Empty_byte _M_empty;
	T _M_payload;
      };
      bool _M_engaged;
    };

  template<typename T>
    struct _Optional_base
    {
      _Optional_payload<T> _M_payload;
    };

  template<typename T>
    struct optional : _Optional_base<T>
    {
      optional() { }

      optional(T t)
      {
	this->_M_payload._M_payload = t;
	this->_M_payload._M_engaged = true;
      }
    };

  using uintptr_t = __UINTPTR_TYPE__;
  template<typename T> struct shared_ptr;
  template<typename T> struct atomic;
  template<> struct atomic<uintptr_t> { uintptr_t _M_i; };
  template<typename T> struct sp_atomic;
  struct sp_counts { int _M_use_count; int _M_weak_count; };

  // Old representation of std::atomic<std::shared_ptr<T>>, before GCC 16
  template<typename T>
    struct sp_atomic<shared_ptr<T>>
    {
      T* _M_ptr = nullptr;
      struct Impl {
	atomic<uintptr_t> _M_val;
	using pointer = sp_counts*;
      } _M_refcount;
    };
  template<typename T>
    struct atomic<shared_ptr<T>>
    {
      sp_atomic<shared_ptr<T>> _M_impl;
    };

} // namespace std

int
main()
{
  struct datum { };
  std::unique_ptr<datum> uptr (new datum);
// { dg-final { regexp-test uptr {std::unique_ptr.datum. = {get\(\) = 0x.*}} } }
  std::unique_ptr<datum> &ruptr = uptr;
// { dg-final { regexp-test ruptr {std::unique_ptr.datum. = {get\(\) = 0x.*}} } }

  using std::optional;

  optional<int> o;
// { dg-final { note-test o {std::optional [no contained value]} } }
  optional<bool> ob{false};
// { dg-final { note-test ob {std::optional = {[contained value] = false}} } }
  optional<int> oi{5};
// { dg-final { note-test oi {std::optional = {[contained value] = 5}} } }
  optional<void*> op{nullptr};
// { dg-final { note-test op {std::optional = {[contained value] = 0x0}} } }

  std::atomic<std::shared_ptr<int>> aspe{};
// { dg-final { note-test aspe {std::atomic<std::shared_ptr<int>> (empty) = {get() = 0x0}} } }

  std::sp_counts counts{ 1, 3 };
  std::sp_atomic<std::shared_ptr<int>>::Impl::pointer p = &counts;
  std::atomic<std::shared_ptr<int>> asp{};
  asp._M_impl._M_ptr = reinterpret_cast<int*>(0x1234abcd);
  asp._M_impl._M_refcount._M_val._M_i = reinterpret_cast<std::uintptr_t>(p);
// { dg-final { note-test asp {std::atomic<std::shared_ptr<int>> (use count 1, weak count 2) = {get() = 0x1234abcd}} } }

  __builtin_puts("");
  return 0;			// Mark SPOT
}

// { dg-final { gdb-test SPOT } }