b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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');
|
|
}
|
|
}
|