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// 1999-09-20 bkoz
// Copyright (C) 1999-2021 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
// 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
// <>.
// 27.4.3 template class fpos
#include <cwchar> // for mbstate_t
#include <ios>
#include <cstring>
#include <testsuite_hooks.h>
void test01()
typedef std::mbstate_t state_type;
// Use zero-initialization of the underlying memory so that padding
// bytes, if any, stand a better chance of comparing the same.
// Zero-initialized memory is guaranteed to be a valid initial
// state. This doesn't quite guarantee that any padding bits won't
// be overwritten when copying from other instances that haven't
// been fully initialized: this data type is compatible with C, so
// it is likely plain old data, but it could have a default ctor
// that initializes only the relevant fields, whereas copy-ctor and
// operator= could be implemented as a full-object memcpy, including
// padding bits, rather than fieldwise copying. However, since
// we're comparing two values copied from the same state_type
// instance, if padding bits are copied, we'll get the same for both
// of them, and if they aren't, we'll keep the values we initialized
// them with, so this should be good.
state_type state[2];
std::memset(state, 0, sizeof (state));
std::streampos pos01(0);
// fpos members
// void state(state_type s);
// state_type state();
// XXX Need to have better sanity checking for the mbstate_t type,
// or whatever the instantiating type for class fpos happens to be
// for streampos, as things like equality operators and assignment
// operators, increment and deincrement operators need to be in
// place.
state[0] = pos01.state();
VERIFY( std::memcmp(&state[0], &state[1], sizeof(state_type)) == 0 );
int main()
return 0;