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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/uintn-identity.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/uintn-identity.h

     1	/* Inline functions to return unsigned integer values unchanged.
     2	   Copyright (C) 2017-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#if !defined _NETINET_IN_H && !defined _ENDIAN_H
    20	# error "Never use <bits/uintn-identity.h> directly; include <netinet/in.h> or <endian.h> instead."
    21	#endif
    22	
    23	#ifndef _BITS_UINTN_IDENTITY_H
    24	#define _BITS_UINTN_IDENTITY_H 1
    25	
    26	#include <bits/types.h>
    27	
    28	/* These inline functions are to ensure the appropriate type
    29	   conversions and associated diagnostics from macros that convert to
    30	   a given endianness.  */
    31	
    32	static __inline __uint16_t
    33	__uint16_identity (__uint16_t __x)
    34	{
    35	  return __x;
    36	}
    37	
    38	static __inline __uint32_t
    39	__uint32_identity (__uint32_t __x)
    40	{
    41	  return __x;
    42	}
    43	
    44	static __inline __uint64_t
    45	__uint64_identity (__uint64_t __x)
    46	{
    47	  return __x;
    48	}
    49	
    50	#endif /* _BITS_UINTN_IDENTITY_H.  */