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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <istream>
// pos_type tellg();
#include <istream>
#include <cassert>
#include "test_macros.h"
template <class CharT>
struct testbuf
: public std::basic_streambuf<CharT>
{
typedef std::basic_string<CharT> string_type;
typedef std::basic_streambuf<CharT> base;
private:
string_type str_;
public:
testbuf() {}
testbuf(const string_type& str)
: str_(str)
{
base::setg(const_cast<CharT*>(str_.data()),
const_cast<CharT*>(str_.data()),
const_cast<CharT*>(str_.data()) + str_.size());
}
CharT* eback() const {return base::eback();}
CharT* gptr() const {return base::gptr();}
CharT* egptr() const {return base::egptr();}
protected:
typename base::pos_type seekoff(typename base::off_type off,
std::ios_base::seekdir way,
std::ios_base::openmode which)
{
assert(off == 0);
assert(way == std::ios_base::cur);
assert(which == std::ios_base::in);
return 5;
}
};
int main(int, char**)
{
{
testbuf<char> sb(" 123456789");
std::istream is(&sb);
assert(is.tellg() == 5);
}
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
testbuf<wchar_t> sb(L" 123456789");
std::wistream is(&sb);
assert(is.tellg() == 5);
}
#endif
return 0;
}
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