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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.
//
//===----------------------------------------------------------------------===//
// <fstream>
// int_type pbackfail(int_type c = traits::eof());
// This test is not entirely portable
#include <fstream>
#include <cassert>
template <class CharT>
struct test_buf
: public std::basic_filebuf<CharT>
{
typedef std::basic_filebuf<CharT> base;
typedef typename base::char_type char_type;
typedef typename base::int_type int_type;
typedef typename base::traits_type traits_type;
char_type* eback() const {return base::eback();}
char_type* gptr() const {return base::gptr();}
char_type* egptr() const {return base::egptr();}
void gbump(int n) {base::gbump(n);}
virtual int_type pbackfail(int_type c = traits_type::eof()) {return base::pbackfail(c);}
};
int main()
{
{
test_buf<char> f;
assert(f.open("underflow.dat", std::ios_base::in) != 0);
assert(f.is_open());
assert(f.sbumpc() == '1');
assert(f.sgetc() == '2');
assert(f.pbackfail('a') == -1);
}
{
test_buf<char> f;
assert(f.open("underflow.dat", std::ios_base::in | std::ios_base::out) != 0);
assert(f.is_open());
assert(f.sbumpc() == '1');
assert(f.sgetc() == '2');
assert(f.pbackfail('a') == 'a');
assert(f.sbumpc() == 'a');
assert(f.sgetc() == '2');
}
}
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