| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <istream> |
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| 10 | |
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| 11 | // pos_type tellg(); |
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| 12 | |
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| 13 | #include <istream> |
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| 14 | #include <cassert> |
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| 15 | #include <streambuf> |
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| 16 | |
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| 17 | #include "test_macros.h" |
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| 18 | |
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| 19 | template <class CharT> |
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| 20 | struct testbuf |
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| 21 | : public std::basic_streambuf<CharT> |
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| 22 | { |
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| 23 | typedef std::basic_string<CharT> string_type; |
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| 24 | typedef std::basic_streambuf<CharT> base; |
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| 25 | private: |
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| 26 | string_type str_; |
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| 27 | public: |
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| 28 | |
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| 29 | testbuf() {} |
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| 30 | testbuf(const string_type& str) |
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| 31 | : str_(str) |
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| 32 | { |
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| 33 | base::setg(const_cast<CharT*>(str_.data()), |
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| 34 | const_cast<CharT*>(str_.data()), |
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| 35 | const_cast<CharT*>(str_.data()) + str_.size()); |
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| 36 | } |
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| 37 | |
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| 38 | CharT* eback() const {return base::eback();} |
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| 39 | CharT* gptr() const {return base::gptr();} |
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| 40 | CharT* egptr() const {return base::egptr();} |
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| 41 | protected: |
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| 42 | typename base::pos_type seekoff(typename base::off_type off, |
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| 43 | std::ios_base::seekdir way, |
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| 44 | std::ios_base::openmode which) |
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| 45 | { |
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| 46 | assert(off == 0); |
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| 47 | assert(way == std::ios_base::cur); |
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| 48 | assert(which == std::ios_base::in); |
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| 49 | return 5; |
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| 50 | } |
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| 51 | }; |
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| 52 | |
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| 53 | int main(int, char**) |
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| 54 | { |
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| 55 | { |
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| 56 | testbuf<char> sb(" 123456789" ); |
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| 57 | std::istream is(&sb); |
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| 58 | assert(is.tellg() == 5); |
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| 59 | } |
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| 60 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
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| 61 | { |
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| 62 | testbuf<wchar_t> sb(L" 123456789" ); |
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| 63 | std::wistream is(&sb); |
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| 64 | assert(is.tellg() == 5); |
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| 65 | } |
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| 66 | #endif |
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| 67 | |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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