libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp

   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 // <locale>
  10
  11 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT -D_LIBCPP_ENABLE_CXX26_REMOVED_WSTRING_CONVERT
  12
  13 // wbuffer_convert<Codecvt, Elem, Tr>
  14
  15 // int_type pbackfail(int_type c = traits::eof());
  16
  17 // This test is not entirely portable
  18
  19 // XFAIL: no-wide-characters
  20
  21 #include <locale>
  22 #include <cassert>
  23 #include <codecvt>
  24 #include <sstream>
  25
  26 struct test_buf
  27     : public std::wbuffer_convert<std::codecvt_utf8<wchar_t> >
  28 {
  29     typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > base;
  30     typedef base::char_type   char_type;
  31     typedef base::int_type    int_type;
  32     typedef base::traits_type traits_type;
  33
  34     explicit test_buf(std::streambuf* sb) : base(sb) {}
  35
  36     char_type* eback() const {return base::eback();}
  37     char_type* gptr()  const {return base::gptr();}
  38     char_type* egptr() const {return base::egptr();}
  39     void gbump(int n) {base::gbump(n);}
  40
  41     virtual int_type pbackfail(int_type c = traits_type::eof()) {return base::pbackfail(c);}
  42 };
  43
  44 int main(int, char**)
  45 {
  46     std::string const s = "123456789";
  47     {
  48         std::istringstream in(s);
  49         test_buf f(in.rdbuf());
  50         assert(f.sbumpc() == L'1');
  51         assert(f.sgetc() == L'2');
  52         assert(f.pbackfail(L'a') == test_buf::traits_type::eof());
  53     }
  54     {
  55         std::istringstream in(s);
  56         test_buf f(in.rdbuf());
  57         assert(f.sbumpc() == L'1');
  58         assert(f.sgetc() == L'2');
  59         assert(f.pbackfail(L'a') == test_buf::traits_type::eof());
  60         assert(f.sbumpc() == L'2');
  61         assert(f.sgetc() == L'3');
  62     }
  63
  64   return 0;
  65 }