FM / bits

/usr/include/c++/9/bits

Name	Size	Mode	Actions
algorithmfwd.h	21737	0644	edit dl rm
allocated_ptr.h	3293	0644	edit dl rm
allocator.h	7942	0644	edit dl rm
alloc_traits.h	21481	0644	edit dl rm
atomic_base.h	24993	0644	edit dl rm
atomic_futex.h	9499	0644	edit dl rm
atomic_lockfree_defines.h	2353	0644	edit dl rm
basic_ios.h	16080	0644	edit dl rm
basic_ios.tcc	6083	0644	edit dl rm
basic_string.h	247075	0644	edit dl rm
basic_string.tcc	53891	0644	edit dl rm
boost_concept_check.h	27161	0644	edit dl rm
c++0x_warning.h	1474	0644	edit dl rm
char_traits.h	24828	0644	edit dl rm
codecvt.h	25429	0644	edit dl rm
concept_check.h	3423	0644	edit dl rm
cpp_type_traits.h	9947	0644	edit dl rm
cxxabi_forced.h	1811	0644	edit dl rm
cxxabi_init_exception.h	2220	0644	edit dl rm
deque.tcc	34404	0644	edit dl rm
enable_special_members.h	12387	0644	edit dl rm
erase_if.h	2037	0644	edit dl rm
exception.h	2486	0644	edit dl rm
exception_defines.h	1645	0644	edit dl rm
exception_ptr.h	5982	0644	edit dl rm
forward_list.h	49405	0644	edit dl rm
forward_list.tcc	13871	0644	edit dl rm
fstream.tcc	33663	0644	edit dl rm
fs_dir.h	15168	0644	edit dl rm
fs_fwd.h	11687	0644	edit dl rm
fs_ops.h	9731	0644	edit dl rm
fs_path.h	36954	0644	edit dl rm
functexcept.h	3433	0644	edit dl rm
functional_hash.h	8568	0644	edit dl rm
gslice.h	5519	0644	edit dl rm
gslice_array.h	7852	0644	edit dl rm
hashtable.h	74814	0644	edit dl rm
hashtable_policy.h	68109	0644	edit dl rm
hash_bytes.h	2146	0644	edit dl rm
indirect_array.h	7862	0644	edit dl rm
invoke.h	3657	0644	edit dl rm
ios_base.h	31434	0644	edit dl rm
istream.tcc	31093	0644	edit dl rm
list.tcc	16968	0644	edit dl rm
localefwd.h	5941	0644	edit dl rm
locale_classes.h	24903	0644	edit dl rm
locale_classes.tcc	8375	0644	edit dl rm
locale_conv.h	18801	0644	edit dl rm
locale_facets.h	92339	0644	edit dl rm
locale_facets.tcc	39548	0644	edit dl rm
locale_facets_nonio.h	68994	0644	edit dl rm
locale_facets_nonio.tcc	45280	0644	edit dl rm
mask_array.h	7676	0644	edit dl rm
memoryfwd.h	2453	0644	edit dl rm
move.h	6529	0644	edit dl rm
nested_exception.h	4803	0644	edit dl rm
node_handle.h	8216	0644	edit dl rm
ostream.tcc	12315	0644	edit dl rm
ostream_insert.h	4002	0644	edit dl rm
parse_numbers.h	7944	0644	edit dl rm
postypes.h	8465	0644	edit dl rm
predefined_ops.h	9083	0644	edit dl rm
ptr_traits.h	6728	0644	edit dl rm
quoted_string.h	5053	0644	edit dl rm
random.h	178041	0644	edit dl rm
random.tcc	105619	0644	edit dl rm
range_access.h	10084	0644	edit dl rm
refwrap.h	12927	0644	edit dl rm
regex.h	98707	0644	edit dl rm
regex.tcc	16574	0644	edit dl rm
regex_automaton.h	10739	0644	edit dl rm
regex_automaton.tcc	7722	0644	edit dl rm
regex_compiler.h	16482	0644	edit dl rm
regex_compiler.tcc	18929	0644	edit dl rm
regex_constants.h	14707	0644	edit dl rm
regex_error.h	4907	0644	edit dl rm
regex_executor.h	7489	0644	edit dl rm
regex_executor.tcc	18841	0644	edit dl rm
regex_scanner.h	7089	0644	edit dl rm
regex_scanner.tcc	15009	0644	edit dl rm
shared_ptr.h	24221	0644	edit dl rm
shared_ptr_atomic.h	9775	0644	edit dl rm
shared_ptr_base.h	53771	0644	edit dl rm
slice_array.h	9430	0644	edit dl rm
specfun.h	47052	0644	edit dl rm
sstream.tcc	10142	0644	edit dl rm
std_abs.h	3384	0644	edit dl rm
std_function.h	23566	0644	edit dl rm
std_mutex.h	4768	0644	edit dl rm
stl_algo.h	215416	0644	edit dl rm
stl_algobase.h	51417	0644	edit dl rm
stl_bvector.h	33888	0644	edit dl rm
stl_construct.h	7397	0644	edit dl rm
stl_deque.h	80116	0644	edit dl rm
stl_function.h	42293	0644	edit dl rm
stl_heap.h	20206	0644	edit dl rm
stl_iterator.h	42755	0644	edit dl rm
stl_iterator_base_funcs.h	8178	0644	edit dl rm
stl_iterator_base_types.h	8682	0644	edit dl rm
stl_list.h	67809	0644	edit dl rm
stl_map.h	53495	0644	edit dl rm
stl_multimap.h	42240	0644	edit dl rm
stl_multiset.h	36486	0644	edit dl rm
stl_numeric.h	14376	0644	edit dl rm
stl_pair.h	18642	0644	edit dl rm
stl_queue.h	24580	0644	edit dl rm
stl_raw_storage_iter.h	3830	0644	edit dl rm
stl_relops.h	4594	0644	edit dl rm
stl_set.h	36790	0644	edit dl rm
stl_stack.h	12228	0644	edit dl rm
stl_tempbuf.h	8287	0644	edit dl rm
stl_tree.h	75018	0644	edit dl rm
stl_uninitialized.h	31455	0644	edit dl rm
stl_vector.h	64968	0644	edit dl rm
streambuf.tcc	4929	0644	edit dl rm
streambuf_iterator.h	13889	0644	edit dl rm
stream_iterator.h	6867	0644	edit dl rm
stringfwd.h	2690	0644	edit dl rm
string_view.tcc	6698	0644	edit dl rm
uniform_int_dist.h	10248	0644	edit dl rm
unique_lock.h	6102	0644	edit dl rm
unique_ptr.h	27564	0644	edit dl rm
unordered_map.h	76884	0644	edit dl rm
unordered_set.h	60677	0644	edit dl rm
uses_allocator.h	6824	0644	edit dl rm
valarray_after.h	22839	0644	edit dl rm
valarray_array.h	21295	0644	edit dl rm
valarray_array.tcc	7254	0644	edit dl rm
valarray_before.h	19142	0644	edit dl rm
vector.tcc	30870	0644	edit dl rm

Edit: /usr/include/c++/9/bits/invoke.h (3657B)

// Implementation of INVOKE -*- C++ -*-

// Copyright (C) 2016-2019 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/bits/invoke.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{functional}
 */

#ifndef _GLIBCXX_INVOKE_H
#define _GLIBCXX_INVOKE_H 1

#pragma GCC system_header

#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else

#include <type_traits>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   *  @addtogroup utilities
   *  @{
   */

// Used by __invoke_impl instead of std::forward<_Tp> so that a
  // reference_wrapper is converted to an lvalue-reference.
  template<typename _Tp, typename _Up = typename __inv_unwrap<_Tp>::type>
    constexpr _Up&&
    __invfwd(typename remove_reference<_Tp>::type& __t) noexcept
    { return static_cast<_Up&&>(__t); }

template<typename _Res, typename _Fn, typename... _Args>
    constexpr _Res
    __invoke_impl(__invoke_other, _Fn&& __f, _Args&&... __args)
    { return std::forward<_Fn>(__f)(std::forward<_Args>(__args)...); }

template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
    constexpr _Res
    __invoke_impl(__invoke_memfun_ref, _MemFun&& __f, _Tp&& __t,
		  _Args&&... __args)
    { return (__invfwd<_Tp>(__t).*__f)(std::forward<_Args>(__args)...); }

template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
    constexpr _Res
    __invoke_impl(__invoke_memfun_deref, _MemFun&& __f, _Tp&& __t,
		  _Args&&... __args)
    {
      return ((*std::forward<_Tp>(__t)).*__f)(std::forward<_Args>(__args)...);
    }

template<typename _Res, typename _MemPtr, typename _Tp>
    constexpr _Res
    __invoke_impl(__invoke_memobj_ref, _MemPtr&& __f, _Tp&& __t)
    { return __invfwd<_Tp>(__t).*__f; }

template<typename _Res, typename _MemPtr, typename _Tp>
    constexpr _Res
    __invoke_impl(__invoke_memobj_deref, _MemPtr&& __f, _Tp&& __t)
    { return (*std::forward<_Tp>(__t)).*__f; }

/// Invoke a callable object.
  template<typename _Callable, typename... _Args>
    constexpr typename __invoke_result<_Callable, _Args...>::type
    __invoke(_Callable&& __fn, _Args&&... __args)
    noexcept(__is_nothrow_invocable<_Callable, _Args...>::value)
    {
      using __result = __invoke_result<_Callable, _Args...>;
      using __type = typename __result::type;
      using __tag = typename __result::__invoke_type;
      return std::__invoke_impl<__type>(__tag{}, std::forward<_Callable>(__fn),
					std::forward<_Args>(__args)...);
    }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // C++11

#endif // _GLIBCXX_INVOKE_H

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