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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <sstream>
// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf
// int_type pbackfail(int_type c = traits::eof());
#include <sstream>
#include <cassert>
template <class CharT>
struct testbuf
: public std::basic_stringbuf<CharT>
{
typedef std::basic_stringbuf<CharT> base;
explicit testbuf(const std::basic_string<CharT>& str,
std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
: base(str, which) {}
typename base::int_type
pbackfail(typename base::int_type c = base::traits_type::eof())
{return base::pbackfail(c);}
void pbump(int n) {base::pbump(n);}
};
int main()
{
{ // sanity check
testbuf<char> tb("");
tb.pbackfail();
}
{
testbuf<char> sb("123", std::ios_base::in);
assert(sb.sgetc() == '1');
assert(sb.snextc() == '2');
assert(sb.snextc() == '3');
assert(sb.sgetc() == '3');
assert(sb.snextc() == std::char_traits<char>::eof());
assert(sb.pbackfail('3') == '3');
assert(sb.pbackfail('3') == std::char_traits<char>::eof());
assert(sb.pbackfail('2') == '2');
assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
assert(sb.str() == "123");
}
{
testbuf<char> sb("123");
assert(sb.sgetc() == '1');
assert(sb.snextc() == '2');
assert(sb.snextc() == '3');
assert(sb.sgetc() == '3');
assert(sb.snextc() == std::char_traits<char>::eof());
assert(sb.pbackfail('3') == '3');
assert(sb.pbackfail('3') == '3');
assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
assert(sb.str() == "133");
}
{
testbuf<wchar_t> sb(L"123", std::ios_base::in);
assert(sb.sgetc() == L'1');
assert(sb.snextc() == L'2');
assert(sb.snextc() == L'3');
assert(sb.sgetc() == L'3');
assert(sb.snextc() == std::char_traits<wchar_t>::eof());
assert(sb.pbackfail(L'3') == L'3');
assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof());
assert(sb.pbackfail(L'2') == L'2');
assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
assert(sb.str() == L"123");
}
{
testbuf<wchar_t> sb(L"123");
assert(sb.sgetc() == L'1');
assert(sb.snextc() == L'2');
assert(sb.snextc() == L'3');
assert(sb.sgetc() == L'3');
assert(sb.snextc() == std::char_traits<wchar_t>::eof());
assert(sb.pbackfail(L'3') == L'3');
assert(sb.pbackfail(L'3') == L'3');
assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
assert(sb.str() == L"133");
}
}
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