forked from OSchip/llvm-project
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <fstream>
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// int_type pbackfail(int_type c = traits::eof());
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// This test is not entirely portable
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#include <fstream>
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#include <cassert>
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template <class CharT>
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struct test_buf
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: public std::basic_filebuf<CharT>
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{
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typedef std::basic_filebuf<CharT> base;
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typedef typename base::char_type char_type;
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typedef typename base::int_type int_type;
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typedef typename base::traits_type traits_type;
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char_type* eback() const {return base::eback();}
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char_type* gptr() const {return base::gptr();}
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char_type* egptr() const {return base::egptr();}
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void gbump(int n) {base::gbump(n);}
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virtual int_type pbackfail(int_type c = traits_type::eof()) {return base::pbackfail(c);}
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};
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int main()
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{
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{
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test_buf<char> f;
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assert(f.open("underflow.dat", std::ios_base::in) != 0);
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assert(f.is_open());
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assert(f.sbumpc() == '1');
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assert(f.sgetc() == '2');
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assert(f.pbackfail('a') == -1);
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}
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{
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test_buf<char> f;
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assert(f.open("underflow.dat", std::ios_base::in | std::ios_base::out) != 0);
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assert(f.is_open());
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assert(f.sbumpc() == '1');
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assert(f.sgetc() == '2');
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assert(f.pbackfail('a') == 'a');
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assert(f.sbumpc() == 'a');
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assert(f.sgetc() == '2');
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}
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}
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