74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <ostream>
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// template <class charT, class traits = char_traits<charT> >
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// class basic_ostream;
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// basic_ostream<charT,traits>& seekp(off_type off, ios_base::seekdir dir);
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#include <ostream>
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#include <cassert>
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#include "test_macros.h"
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int seekoff_called = 0;
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template <class CharT>
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struct testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_streambuf<CharT> base;
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testbuf() {}
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protected:
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typename base::pos_type
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seekoff(typename base::off_type off, std::ios_base::seekdir way,
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std::ios_base::openmode which)
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{
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++seekoff_called;
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assert(way == std::ios_base::beg);
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assert(which == std::ios_base::out);
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return off;
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}
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};
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int main(int, char**)
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{
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{
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seekoff_called = 0;
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std::ostream os((std::streambuf*)0);
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assert(&os.seekp(5, std::ios_base::beg) == &os);
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assert(seekoff_called == 0);
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}
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{
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seekoff_called = 0;
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testbuf<char> sb;
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std::ostream os(&sb);
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assert(&os.seekp(10, std::ios_base::beg) == &os);
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assert(seekoff_called == 1);
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assert(os.good());
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assert(&os.seekp(-1, std::ios_base::beg) == &os);
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assert(seekoff_called == 2);
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assert(os.fail());
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}
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{ // See https://llvm.org/PR21361
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seekoff_called = 0;
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testbuf<char> sb;
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std::ostream os(&sb);
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os.setstate(std::ios_base::eofbit);
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assert(&os.seekp(10, std::ios_base::beg) == &os);
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assert(seekoff_called == 1);
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assert(os.rdstate() == std::ios_base::eofbit);
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}
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return 0;
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}
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