| //===----------------------------------------------------------------------===// |
| // |
| // 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); |
| } |
| { |
| testbuf<wchar_t> sb(L" 123456789"); |
| std::wistream is(&sb); |
| assert(is.tellg() == 5); |
| } |
| |
| return 0; |
| } |