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atomic
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// -*- C++ -*- header.
// Copyright (C) 2008-2020 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/atomic
* This is a Standard C++ Library header.
*/
// Based on "C++ Atomic Types and Operations" by Hans Boehm and Lawrence Crowl.
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html
#ifndef _GLIBCXX_ATOMIC
#define _GLIBCXX_ATOMIC 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <bits/atomic_base.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup atomics
* @{
*/
#if __cplusplus >= 201703L
# define __cpp_lib_atomic_is_always_lock_free 201603
#endif
template<typename _Tp>
struct atomic;
/// atomic<bool>
// NB: No operators or fetch-operations for this type.
template<>
struct atomic<bool>
{
using value_type = bool;
private:
__atomic_base<bool> _M_base;
public:
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(bool __i) noexcept : _M_base(__i) { }
bool
operator=(bool __i) noexcept
{ return _M_base.operator=(__i); }
bool
operator=(bool __i) volatile noexcept
{ return _M_base.operator=(__i); }
operator bool() const noexcept
{ return _M_base.load(); }
operator bool() const volatile noexcept
{ return _M_base.load(); }
bool
is_lock_free() const noexcept { return _M_base.is_lock_free(); }
bool
is_lock_free() const volatile noexcept { return _M_base.is_lock_free(); }
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_BOOL_LOCK_FREE == 2;
#endif
void
store(bool __i, memory_order __m = memory_order_seq_cst) noexcept
{ _M_base.store(__i, __m); }
void
store(bool __i, memory_order __m = memory_order_seq_cst) volatile noexcept
{ _M_base.store(__i, __m); }
bool
load(memory_order __m = memory_order_seq_cst) const noexcept
{ return _M_base.load(__m); }
bool
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{ return _M_base.load(__m); }
bool
exchange(bool __i, memory_order __m = memory_order_seq_cst) noexcept
{ return _M_base.exchange(__i, __m); }
bool
exchange(bool __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_base.exchange(__i, __m); }
bool
compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1,
memory_order __m2) noexcept
{ return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); }
bool
compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1,
memory_order __m2) volatile noexcept
{ return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); }
bool
compare_exchange_weak(bool& __i1, bool __i2,
memory_order __m = memory_order_seq_cst) noexcept
{ return _M_base.compare_exchange_weak(__i1, __i2, __m); }
bool
compare_exchange_weak(bool& __i1, bool __i2,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_base.compare_exchange_weak(__i1, __i2, __m); }
bool
compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1,
memory_order __m2) noexcept
{ return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); }
bool
compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1,
memory_order __m2) volatile noexcept
{ return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); }
bool
compare_exchange_strong(bool& __i1, bool __i2,
memory_order __m = memory_order_seq_cst) noexcept
{ return _M_base.compare_exchange_strong(__i1, __i2, __m); }
bool
compare_exchange_strong(bool& __i1, bool __i2,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_base.compare_exchange_strong(__i1, __i2, __m); }
};
#if __cplusplus <= 201703L
# define _GLIBCXX20_INIT(I)
#else
# define _GLIBCXX20_INIT(I) = I
#endif
/**
* @brief Generic atomic type, primary class template.
*
* @tparam _Tp Type to be made atomic, must be trivially copyable.
*/
template<typename _Tp>
struct atomic
{
using value_type = _Tp;
private:
// Align 1/2/4/8/16-byte types to at least their size.
static constexpr int _S_min_alignment
= (sizeof(_Tp) & (sizeof(_Tp) - 1)) || sizeof(_Tp) > 16
? 0 : sizeof(_Tp);
static constexpr int _S_alignment
= _S_min_alignment > alignof(_Tp) ? _S_min_alignment : alignof(_Tp);
alignas(_S_alignment) _Tp _M_i _GLIBCXX20_INIT(_Tp());
static_assert(__is_trivially_copyable(_Tp),
"std::atomic requires a trivially copyable type");
static_assert(sizeof(_Tp) > 0,
"Incomplete or zero-sized types are not supported");
public:
atomic() = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(_Tp __i) noexcept : _M_i(__i) { }
operator _Tp() const noexcept
{ return load(); }
operator _Tp() const volatile noexcept
{ return load(); }
_Tp
operator=(_Tp __i) noexcept
{ store(__i); return __i; }
_Tp
operator=(_Tp __i) volatile noexcept
{ store(__i); return __i; }
bool
is_lock_free() const noexcept
{
// Produce a fake, minimally aligned pointer.
return __atomic_is_lock_free(sizeof(_M_i),
reinterpret_cast<void *>(-_S_alignment));
}
bool
is_lock_free() const volatile noexcept
{
// Produce a fake, minimally aligned pointer.
return __atomic_is_lock_free(sizeof(_M_i),
reinterpret_cast<void *>(-_S_alignment));
}
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free
= __atomic_always_lock_free(sizeof(_M_i), 0);
#endif
void
store(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept
{ __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); }
void
store(_Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept
{ __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); }
_Tp
load(memory_order __m = memory_order_seq_cst) const noexcept
{
alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
_Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
__atomic_load(std::__addressof(_M_i), __ptr, int(__m));
return *__ptr;
}
_Tp
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{
alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
_Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
__atomic_load(std::__addressof(_M_i), __ptr, int(__m));
return *__ptr;
}
_Tp
exchange(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept
{
alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
_Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
__atomic_exchange(std::__addressof(_M_i), std::__addressof(__i),
__ptr, int(__m));
return *__ptr;
}
_Tp
exchange(_Tp __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
_Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
__atomic_exchange(std::__addressof(_M_i), std::__addressof(__i),
__ptr, int(__m));
return *__ptr;
}
bool
compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s,
memory_order __f) noexcept
{
return __atomic_compare_exchange(std::__addressof(_M_i),
std::__addressof(__e),
std::__addressof(__i),
true, int(__s), int(__f));
}
bool
compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s,
memory_order __f) volatile noexcept
{
return __atomic_compare_exchange(std::__addressof(_M_i),
std::__addressof(__e),
std::__addressof(__i),
true, int(__s), int(__f));
}
bool
compare_exchange_weak(_Tp& __e, _Tp __i,
memory_order __m = memory_order_seq_cst) noexcept
{ return compare_exchange_weak(__e, __i, __m,
__cmpexch_failure_order(__m)); }
bool
compare_exchange_weak(_Tp& __e, _Tp __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return compare_exchange_weak(__e, __i, __m,
__cmpexch_failure_order(__m)); }
bool
compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s,
memory_order __f) noexcept
{
return __atomic_compare_exchange(std::__addressof(_M_i),
std::__addressof(__e),
std::__addressof(__i),
false, int(__s), int(__f));
}
bool
compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s,
memory_order __f) volatile noexcept
{
return __atomic_compare_exchange(std::__addressof(_M_i),
std::__addressof(__e),
std::__addressof(__i),
false, int(__s), int(__f));
}
bool
compare_exchange_strong(_Tp& __e, _Tp __i,
memory_order __m = memory_order_seq_cst) noexcept
{ return compare_exchange_strong(__e, __i, __m,
__cmpexch_failure_order(__m)); }
bool
compare_exchange_strong(_Tp& __e, _Tp __i,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return compare_exchange_strong(__e, __i, __m,
__cmpexch_failure_order(__m)); }
};
#undef _GLIBCXX20_INIT
/// Partial specialization for pointer types.
template<typename _Tp>
struct atomic<_Tp*>
{
using value_type = _Tp*;
using difference_type = ptrdiff_t;
typedef _Tp* __pointer_type;
typedef __atomic_base<_Tp*> __base_type;
__base_type _M_b;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__pointer_type __p) noexcept : _M_b(__p) { }
operator __pointer_type() const noexcept
{ return __pointer_type(_M_b); }
operator __pointer_type() const volatile noexcept
{ return __pointer_type(_M_b); }
__pointer_type
operator=(__pointer_type __p) noexcept
{ return _M_b.operator=(__p); }
__pointer_type
operator=(__pointer_type __p) volatile noexcept
{ return _M_b.operator=(__p); }
__pointer_type
operator++(int) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b++;
}
__pointer_type
operator++(int) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b++;
}
__pointer_type
operator--(int) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b--;
}
__pointer_type
operator--(int) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b--;
}
__pointer_type
operator++() noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return ++_M_b;
}
__pointer_type
operator++() volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return ++_M_b;
}
__pointer_type
operator--() noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return --_M_b;
}
__pointer_type
operator--() volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return --_M_b;
}
__pointer_type
operator+=(ptrdiff_t __d) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.operator+=(__d);
}
__pointer_type
operator+=(ptrdiff_t __d) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.operator+=(__d);
}
__pointer_type
operator-=(ptrdiff_t __d) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.operator-=(__d);
}
__pointer_type
operator-=(ptrdiff_t __d) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.operator-=(__d);
}
bool
is_lock_free() const noexcept
{ return _M_b.is_lock_free(); }
bool
is_lock_free() const volatile noexcept
{ return _M_b.is_lock_free(); }
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_POINTER_LOCK_FREE == 2;
#endif
void
store(__pointer_type __p,
memory_order __m = memory_order_seq_cst) noexcept
{ return _M_b.store(__p, __m); }
void
store(__pointer_type __p,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_b.store(__p, __m); }
__pointer_type
load(memory_order __m = memory_order_seq_cst) const noexcept
{ return _M_b.load(__m); }
__pointer_type
load(memory_order __m = memory_order_seq_cst) const volatile noexcept
{ return _M_b.load(__m); }
__pointer_type
exchange(__pointer_type __p,
memory_order __m = memory_order_seq_cst) noexcept
{ return _M_b.exchange(__p, __m); }
__pointer_type
exchange(__pointer_type __p,
memory_order __m = memory_order_seq_cst) volatile noexcept
{ return _M_b.exchange(__p, __m); }
bool
compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1, memory_order __m2) noexcept
{ return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
bool
compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1,
memory_order __m2) volatile noexcept
{ return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
bool
compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
memory_order __m = memory_order_seq_cst) noexcept
{
return compare_exchange_weak(__p1, __p2, __m,
__cmpexch_failure_order(__m));
}
bool
compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
return compare_exchange_weak(__p1, __p2, __m,
__cmpexch_failure_order(__m));
}
bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1, memory_order __m2) noexcept
{ return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m1,
memory_order __m2) volatile noexcept
{ return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m = memory_order_seq_cst) noexcept
{
return _M_b.compare_exchange_strong(__p1, __p2, __m,
__cmpexch_failure_order(__m));
}
bool
compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
return _M_b.compare_exchange_strong(__p1, __p2, __m,
__cmpexch_failure_order(__m));
}
__pointer_type
fetch_add(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.fetch_add(__d, __m);
}
__pointer_type
fetch_add(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.fetch_add(__d, __m);
}
__pointer_type
fetch_sub(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.fetch_sub(__d, __m);
}
__pointer_type
fetch_sub(ptrdiff_t __d,
memory_order __m = memory_order_seq_cst) volatile noexcept
{
#if __cplusplus >= 201703L
static_assert( is_object<_Tp>::value, "pointer to object type" );
#endif
return _M_b.fetch_sub(__d, __m);
}
};
/// Explicit specialization for char.
template<>
struct atomic<char> : __atomic_base<char>
{
typedef char __integral_type;
typedef __atomic_base<char> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for signed char.
template<>
struct atomic<signed char> : __atomic_base<signed char>
{
typedef signed char __integral_type;
typedef __atomic_base<signed char> __base_type;
atomic() noexcept= default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for unsigned char.
template<>
struct atomic<unsigned char> : __atomic_base<unsigned char>
{
typedef unsigned char __integral_type;
typedef __atomic_base<unsigned char> __base_type;
atomic() noexcept= default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for short.
template<>
struct atomic<short> : __atomic_base<short>
{
typedef short __integral_type;
typedef __atomic_base<short> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for unsigned short.
template<>
struct atomic<unsigned short> : __atomic_base<unsigned short>
{
typedef unsigned short __integral_type;
typedef __atomic_base<unsigned short> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for int.
template<>
struct atomic<int> : __atomic_base<int>
{
typedef int __integral_type;
typedef __atomic_base<int> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for unsigned int.
template<>
struct atomic<unsigned int> : __atomic_base<unsigned int>
{
typedef unsigned int __integral_type;
typedef __atomic_base<unsigned int> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for long.
template<>
struct atomic<long> : __atomic_base<long>
{
typedef long __integral_type;
typedef __atomic_base<long> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for unsigned long.
template<>
struct atomic<unsigned long> : __atomic_base<unsigned long>
{
typedef unsigned long __integral_type;
typedef __atomic_base<unsigned long> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for long long.
template<>
struct atomic<long long> : __atomic_base<long long>
{
typedef long long __integral_type;
typedef __atomic_base<long long> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for unsigned long long.
template<>
struct atomic<unsigned long long> : __atomic_base<unsigned long long>
{
typedef unsigned long long __integral_type;
typedef __atomic_base<unsigned long long> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for wchar_t.
template<>
struct atomic<wchar_t> : __atomic_base<wchar_t>
{
typedef wchar_t __integral_type;
typedef __atomic_base<wchar_t> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_WCHAR_T_LOCK_FREE == 2;
#endif
};
#ifdef _GLIBCXX_USE_CHAR8_T
/// Explicit specialization for char8_t.
template<>
struct atomic<char8_t> : __atomic_base<char8_t>
{
typedef char8_t __integral_type;
typedef __atomic_base<char8_t> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus > 201402L
static constexpr bool is_always_lock_free = ATOMIC_CHAR8_T_LOCK_FREE == 2;
#endif
};
#endif
/// Explicit specialization for char16_t.
template<>
struct atomic<char16_t> : __atomic_base<char16_t>
{
typedef char16_t __integral_type;
typedef __atomic_base<char16_t> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_CHAR16_T_LOCK_FREE == 2;
#endif
};
/// Explicit specialization for char32_t.
template<>
struct atomic<char32_t> : __atomic_base<char32_t>
{
typedef char32_t __integral_type;
typedef __atomic_base<char32_t> __base_type;
atomic() noexcept = default;
~atomic() noexcept = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
using __base_type::operator __integral_type;
using __base_type::operator=;
#if __cplusplus >= 201703L
static constexpr bool is_always_lock_free = ATOMIC_CHAR32_T_LOCK_FREE == 2;
#endif
};
/// atomic_bool
typedef atomic<bool> atomic_bool;
/// atomic_char
typedef atomic<char> atomic_char;
/// atomic_schar
typedef atomic<signed char> atomic_schar;
/// atomic_uchar
typedef atomic<unsigned char> atomic_uchar;
/// atomic_short
typedef atomic<short> atomic_short;
/// atomic_ushort
typedef atomic<unsigned short> atomic_ushort;