1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <ostream>
10
11// template <class charT, class traits = char_traits<charT> >
12// class basic_ostream;
13
14// pos_type tellp();
15
16#include <ostream>
17#include <cassert>
18
19#include "test_macros.h"
20
21int seekoff_called = 0;
22
23template <class CharT>
24struct testbuf
25 : public std::basic_streambuf<CharT>
26{
27 typedef std::basic_streambuf<CharT> base;
28 testbuf() {}
29
30protected:
31
32 typename base::pos_type
33 seekoff(typename base::off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
34 {
35 assert(off == 0);
36 assert(way == std::ios_base::cur);
37 assert(which == std::ios_base::out);
38 ++seekoff_called;
39 return 10;
40 }
41};
42
43int main(int, char**)
44{
45 {
46 std::ostream os((std::streambuf*)0);
47 assert(os.tellp() == -1);
48 }
49 {
50 testbuf<char> sb;
51 std::ostream os(&sb);
52 assert(os.tellp() == 10);
53 assert(seekoff_called == 1);
54 }
55
56 return 0;
57}
58

source code of libcxx/test/std/input.output/iostream.format/output.streams/ostream.seeks/tellp.pass.cpp