libcxx/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.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 // XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
  10
  11 // <istream>
  12
  13 // basic_istream<charT,traits>&
  14 //    ignore(streamsize n = 1, int_type delim = traits::eof());
  15
  16 #include <istream>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 template <class CharT>
  22 struct testbuf
  23     : public std::basic_streambuf<CharT>
  24 {
  25     typedef std::basic_string<CharT> string_type;
  26     typedef std::basic_streambuf<CharT> base;
  27 private:
  28     string_type str_;
  29 public:
  30
  31     testbuf() {}
  32     testbuf(const string_type& str)
  33         : str_(str)
  34     {
  35         base::setg(const_cast<CharT*>(str_.data()),
  36                    const_cast<CharT*>(str_.data()),
  37                    const_cast<CharT*>(str_.data()) + str_.size());
  38     }
  39
  40     CharT* eback() const {return base::eback();}
  41     CharT* gptr() const {return base::gptr();}
  42     CharT* egptr() const {return base::egptr();}
  43 };
  44
  45 int main(int, char**)
  46 {
  47     {
  48         testbuf<char> sb(" 1\n2345\n6");
  49         std::istream is(&sb);
  50         is.ignore();
  51         assert(!is.eof());
  52         assert(!is.fail());
  53         assert(is.gcount() == 1);
  54         is.ignore(5, '\n');
  55         assert(!is.eof());
  56         assert(!is.fail());
  57         assert(is.gcount() == 2);
  58         is.ignore(15);
  59         assert( is.eof());
  60         assert(!is.fail());
  61         assert(is.gcount() == 6);
  62     }
  63 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  64     {
  65         testbuf<wchar_t> sb(L" 1\n2345\n6");
  66         std::wistream is(&sb);
  67         is.ignore();
  68         assert(!is.eof());
  69         assert(!is.fail());
  70         assert(is.gcount() == 1);
  71         is.ignore(5, '\n');
  72         assert(!is.eof());
  73         assert(!is.fail());
  74         assert(is.gcount() == 2);
  75         is.ignore(15);
  76         assert( is.eof());
  77         assert(!is.fail());
  78         assert(is.gcount() == 6);
  79     }
  80 #endif
  81 #ifndef TEST_HAS_NO_EXCEPTIONS
  82     {
  83         testbuf<char> sb(" ");
  84         std::basic_istream<char> is(&sb);
  85         is.exceptions(std::ios_base::eofbit);
  86         bool threw = false;
  87         try {
  88             is.ignore(5);
  89         } catch (std::ios_base::failure&) {
  90             threw = true;
  91         }
  92         assert(threw);
  93         assert(!is.bad());
  94         assert( is.eof());
  95         assert(!is.fail());
  96     }
  97 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  98     {
  99         testbuf<wchar_t> sb(L" ");
 100         std::basic_istream<wchar_t> is(&sb);
 101         is.exceptions(std::ios_base::eofbit);
 102         bool threw = false;
 103         try {
 104             is.ignore(5);
 105         } catch (std::ios_base::failure&) {
 106             threw = true;
 107         }
 108         assert(threw);
 109         assert(!is.bad());
 110         assert( is.eof());
 111         assert(!is.fail());
 112     }
 113 #endif
 114 #endif // TEST_HAS_NO_EXCEPTIONS
 115
 116     return 0;
 117 }