golden hour

/usr/include/c++/11/bits

File/Folder	Size	Actions
algorithmfwd.h	23.97 KB
align.h	3.62 KB
alloc_traits.h	26.98 KB
allocated_ptr.h	3.25 KB
allocator.h	9.51 KB
atomic_base.h	56.07 KB
atomic_futex.h	12.1 KB
atomic_lockfree_defines.h	2.3 KB
atomic_timed_wait.h	13.21 KB
atomic_wait.h	12.26 KB
basic_ios.h	15.7 KB
basic_ios.tcc	5.94 KB
basic_string.h	246.04 KB
basic_string.tcc	52.92 KB
boost_concept_check.h	26.54 KB
c++0x_warning.h	1.44 KB
char_traits.h	28.66 KB
charconv.h	3.35 KB
codecvt.h	24.9 KB
concept_check.h	3.34 KB
cpp_type_traits.h	13.67 KB
cxxabi_forced.h	1.77 KB
cxxabi_init_exception.h	2.17 KB
deque.tcc	41.37 KB
enable_special_members.h	12.16 KB
erase_if.h	2.02 KB
exception.h	2.45 KB
exception_defines.h	1.61 KB
exception_ptr.h	7.46 KB
forward_list.h	49.21 KB
forward_list.tcc	13.71 KB
fs_dir.h	16.23 KB
fs_fwd.h	10.65 KB
fs_ops.h	10.49 KB
fs_path.h	39.49 KB
fstream.tcc	32.88 KB
functexcept.h	3.43 KB
functional_hash.h	8.39 KB
gslice.h	5.39 KB
gslice_array.h	7.71 KB
hash_bytes.h	2.1 KB
hashtable.h	82.94 KB
hashtable_policy.h	60.84 KB
indirect_array.h	7.72 KB
invoke.h	5.92 KB
ios_base.h	31.19 KB
istream.tcc	30.85 KB
iterator_concepts.h	32.55 KB
list.tcc	16.8 KB
locale_classes.h	24.46 KB
locale_classes.tcc	8.18 KB
locale_conv.h	18.38 KB
locale_facets.h	91.46 KB
locale_facets.tcc	39.51 KB
locale_facets_nonio.h	68.07 KB
locale_facets_nonio.tcc	46.42 KB
localefwd.h	5.8 KB
mask_array.h	7.54 KB
max_size_type.h	22.18 KB
memoryfwd.h	2.45 KB
move.h	6.64 KB
nested_exception.h	4.77 KB
node_handle.h	11.07 KB
ostream.tcc	12.03 KB
ostream_insert.h	3.94 KB
parse_numbers.h	7.79 KB
postypes.h	8.27 KB
predefined_ops.h	9.94 KB
ptr_traits.h	6.55 KB
quoted_string.h	4.93 KB
random.h	174.18 KB
random.tcc	103.21 KB
range_access.h	10.46 KB
ranges_algo.h	114.09 KB
ranges_algobase.h	18.43 KB
ranges_base.h	23.82 KB
ranges_cmp.h	5.88 KB
ranges_uninitialized.h	17.71 KB
ranges_util.h	20.11 KB
refwrap.h	12.9 KB
regex.h	101.53 KB
regex.tcc	16.11 KB
regex_automaton.h	10.54 KB
regex_automaton.tcc	7.54 KB
regex_compiler.h	15.84 KB
regex_compiler.tcc	18.71 KB
regex_constants.h	15.18 KB
regex_error.h	4.9 KB
regex_executor.h	8.64 KB
regex_executor.tcc	18.4 KB
regex_scanner.h	6.88 KB
regex_scanner.tcc	14.89 KB
semaphore_base.h	7.75 KB
shared_ptr.h	30.25 KB
shared_ptr_atomic.h	9.64 KB
shared_ptr_base.h	53.62 KB
slice_array.h	9.39 KB
specfun.h	46.13 KB
sstream.tcc	9.91 KB
std_abs.h	3.28 KB
std_function.h	22.33 KB
std_mutex.h	6.29 KB
std_thread.h	8.39 KB
stl_algo.h	209.67 KB
stl_algobase.h	74.6 KB
stl_bvector.h	34.74 KB
stl_construct.h	8.59 KB
stl_deque.h	75.17 KB
stl_function.h	42.87 KB
stl_heap.h	20.27 KB
stl_iterator.h	77 KB
stl_iterator_base_funcs.h	7.99 KB
stl_iterator_base_types.h	9.44 KB
stl_list.h	68.14 KB
stl_map.h	53.41 KB
stl_multimap.h	42.51 KB
stl_multiset.h	36.79 KB
stl_numeric.h	14.26 KB
stl_pair.h	19.66 KB
stl_queue.h	24.45 KB
stl_raw_storage_iter.h	3.74 KB
stl_relops.h	4.49 KB
stl_set.h	37.05 KB
stl_stack.h	12.39 KB
stl_tempbuf.h	8.45 KB
stl_tree.h	72.16 KB
stl_uninitialized.h	33.22 KB
stl_vector.h	64.37 KB
stream_iterator.h	7.52 KB
streambuf.tcc	4.81 KB
streambuf_iterator.h	15.17 KB
string_view.tcc	7 KB
stringfwd.h	2.63 KB
this_thread_sleep.h	3.23 KB
uniform_int_dist.h	12.75 KB
unique_lock.h	6 KB
unique_ptr.h	31.77 KB
unordered_map.h	74.87 KB
unordered_set.h	61.46 KB
uses_allocator.h	6.74 KB
uses_allocator_args.h	7.38 KB
valarray_after.h	22.74 KB
valarray_array.h	20.8 KB
valarray_array.tcc	7.08 KB
valarray_before.h	18.69 KB
vector.tcc	30.26 KB

Edit: exception_ptr.h

// Exception Handling support header (exception_ptr class) for -*- C++ -*-

// Copyright (C) 2008-2021 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC 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.
// 
// GCC 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 bits/exception_ptr.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{exception}
 */

#ifndef _EXCEPTION_PTR_H
#define _EXCEPTION_PTR_H

#pragma GCC visibility push(default)

#include <bits/c++config.h>
#include <bits/exception_defines.h>
#include <bits/cxxabi_init_exception.h>
#include <typeinfo>
#include <new>

#if __cplusplus >= 201103L
# include <bits/move.h>
#endif

#ifdef _GLIBCXX_EH_PTR_RELOPS_COMPAT
# define _GLIBCXX_EH_PTR_USED __attribute__((__used__))
#else
# define _GLIBCXX_EH_PTR_USED
#endif

extern "C++" {

namespace std 
{
  class type_info;

/**
   * @addtogroup exceptions
   * @{
   */

namespace __exception_ptr
  {
    class exception_ptr;
  }

using __exception_ptr::exception_ptr;

/** Obtain an exception_ptr to the currently handled exception. If there
   *  is none, or the currently handled exception is foreign, return the null
   *  value.
   */
  exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT;

template<typename _Ex>
  exception_ptr make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;

/// Throw the object pointed to by the exception_ptr.
  void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));

namespace __exception_ptr
  {
    using std::rethrow_exception;

/**
     *  @brief An opaque pointer to an arbitrary exception.
     *  @ingroup exceptions
     */
    class exception_ptr
    {
      void* _M_exception_object;

explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT;

void _M_addref() _GLIBCXX_USE_NOEXCEPT;
      void _M_release() _GLIBCXX_USE_NOEXCEPT;

void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__));

friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT;
      friend void std::rethrow_exception(exception_ptr);
      template<typename _Ex>
      friend exception_ptr std::make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;

public:
      exception_ptr() _GLIBCXX_USE_NOEXCEPT;

exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#if __cplusplus >= 201103L
      exception_ptr(nullptr_t) noexcept
      : _M_exception_object(nullptr)
      { }

exception_ptr(exception_ptr&& __o) noexcept
      : _M_exception_object(__o._M_exception_object)
      { __o._M_exception_object = nullptr; }
#endif

#if (__cplusplus < 201103L) || defined (_GLIBCXX_EH_PTR_COMPAT)
      typedef void (exception_ptr::*__safe_bool)();

// For construction from nullptr or 0.
      exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT;
#endif

exception_ptr& 
      operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#if __cplusplus >= 201103L
      exception_ptr& 
      operator=(exception_ptr&& __o) noexcept
      {
        exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
        return *this;
      }
#endif

~exception_ptr() _GLIBCXX_USE_NOEXCEPT;

void 
      swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#ifdef _GLIBCXX_EH_PTR_COMPAT
      // Retained for compatibility with CXXABI_1.3.
      void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__const__));
      bool operator!() const _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__pure__));
      operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT;
#endif

#if __cplusplus >= 201103L
      explicit operator bool() const noexcept
      { return _M_exception_object; }
#endif

#if __cpp_impl_three_way_comparison >= 201907L \
      && ! defined _GLIBCXX_EH_PTR_RELOPS_COMPAT
      friend bool
      operator==(const exception_ptr&, const exception_ptr&) noexcept = default;
#else
      friend _GLIBCXX_EH_PTR_USED bool
      operator==(const exception_ptr& __x, const exception_ptr& __y)
      _GLIBCXX_USE_NOEXCEPT
      { return __x._M_exception_object == __y._M_exception_object; }

friend _GLIBCXX_EH_PTR_USED bool
      operator!=(const exception_ptr& __x, const exception_ptr& __y)
      _GLIBCXX_USE_NOEXCEPT
      { return __x._M_exception_object != __y._M_exception_object; }
#endif

const class std::type_info*
      __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__pure__));
    };

_GLIBCXX_EH_PTR_USED
    inline
    exception_ptr::exception_ptr() _GLIBCXX_USE_NOEXCEPT
    : _M_exception_object(0)
    { }

_GLIBCXX_EH_PTR_USED
    inline
    exception_ptr::exception_ptr(const exception_ptr& __other)
    _GLIBCXX_USE_NOEXCEPT
    : _M_exception_object(__other._M_exception_object)
    {
      if (_M_exception_object)
	_M_addref();
    }

_GLIBCXX_EH_PTR_USED
    inline
    exception_ptr::~exception_ptr() _GLIBCXX_USE_NOEXCEPT
    {
      if (_M_exception_object)
	_M_release();
    }

_GLIBCXX_EH_PTR_USED
    inline exception_ptr&
    exception_ptr::operator=(const exception_ptr& __other) _GLIBCXX_USE_NOEXCEPT
    {
      exception_ptr(__other).swap(*this);
      return *this;
    }

_GLIBCXX_EH_PTR_USED
    inline void
    exception_ptr::swap(exception_ptr &__other) _GLIBCXX_USE_NOEXCEPT
    {
      void *__tmp = _M_exception_object;
      _M_exception_object = __other._M_exception_object;
      __other._M_exception_object = __tmp;
    }

/// @relates exception_ptr
    inline void
    swap(exception_ptr& __lhs, exception_ptr& __rhs)
    { __lhs.swap(__rhs); }

/// @cond undocumented
    template<typename _Ex>
      inline void
      __dest_thunk(void* __x)
      { static_cast<_Ex*>(__x)->~_Ex(); }
    /// @endcond

} // namespace __exception_ptr

/// Obtain an exception_ptr pointing to a copy of the supplied object.
  template<typename _Ex>
    exception_ptr 
    make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT
    {
#if __cpp_exceptions && __cpp_rtti && !_GLIBCXX_HAVE_CDTOR_CALLABI \
      && __cplusplus >= 201103L
      using _Ex2 = typename remove_reference<_Ex>::type;
      void* __e = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ex));
      (void) __cxxabiv1::__cxa_init_primary_exception(
	  __e, const_cast<std::type_info*>(&typeid(_Ex)),
	  __exception_ptr::__dest_thunk<_Ex2>);
      try
	{
	  ::new (__e) _Ex2(std::forward<_Ex>(__ex));
          return exception_ptr(__e);
	}
      catch(...)
	{
	  __cxxabiv1::__cxa_free_exception(__e);
	  return current_exception();
	}
#elif __cpp_exceptions
      try
	{
          throw __ex;
	}
      catch(...)
	{
	  return current_exception();
	}
#else // no RTTI and no exceptions
      return exception_ptr();
#endif
    }

#undef _GLIBCXX_EH_PTR_USED

/// @} group exceptions
} // namespace std

} // extern "C++"

#pragma GCC visibility pop

#endif