libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.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
  12
  13 // wbuffer_convert<Codecvt, Elem, Tr>
  14
  15 // int_type underflow();
  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 #include "test_macros.h"
  27
  28 struct test_buf
  29     : public std::wbuffer_convert<std::codecvt_utf8<wchar_t> >
  30 {
  31     typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > base;
  32     typedef base::char_type   char_type;
  33     typedef base::int_type    int_type;
  34     typedef base::traits_type traits_type;
  35
  36     explicit test_buf(std::streambuf* sb) : base(sb) {}
  37
  38     char_type* eback() const {return base::eback();}
  39     char_type* gptr()  const {return base::gptr();}
  40     char_type* egptr() const {return base::egptr();}
  41     void gbump(int n) {base::gbump(n);}
  42
  43     virtual int_type underflow() {return base::underflow();}
  44 };
  45
  46 int main(int, char**)
  47 {
  48     {
  49         std::string s = "123456789";
  50         std::istringstream bs(s);
  51         test_buf f(bs.rdbuf());
  52         assert(f.eback() == 0);
  53         assert(f.gptr() == 0);
  54         assert(f.egptr() == 0);
  55         assert(f.underflow() == L'1');
  56         assert(f.eback() != 0);
  57         assert(f.eback() == f.gptr());
  58         assert(*f.gptr() == L'1');
  59         assert(f.egptr() - f.eback() == 9);
  60     }
  61     {
  62         std::string s = "123456789";
  63         std::istringstream bs(s);
  64         test_buf f(bs.rdbuf());
  65         assert(f.eback() == 0);
  66         assert(f.gptr() == 0);
  67         assert(f.egptr() == 0);
  68         assert(f.underflow() == L'1');
  69         assert(f.eback() != 0);
  70         assert(f.eback() == f.gptr());
  71         assert(*f.gptr() == L'1');
  72         assert(f.egptr() - f.eback() == 9);
  73         f.gbump(8);
  74         assert(f.sgetc() == L'9');
  75         assert(f.eback()[0] == L'1');
  76         assert(f.eback()[1] == L'2');
  77         assert(f.eback()[2] == L'3');
  78         assert(f.eback()[3] == L'4');
  79         assert(f.gptr() - f.eback() == 8);
  80         assert(*f.gptr() == L'9');
  81         assert(f.egptr() - f.gptr() == 1);
  82     }
  83     {
  84         std::string s = "乑乒乓";
  85         std::istringstream bs(s);
  86         test_buf f(bs.rdbuf());
  87         assert(f.sbumpc() == 0x4E51);
  88         assert(f.sbumpc() == 0x4E52);
  89         assert(f.sbumpc() == 0x4E53);
  90         assert(f.sbumpc() == test_buf::traits_type::eof());
  91     }
  92
  93     return 0;
  94 }