a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.3 KiB
C++
62 lines
1.3 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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// <ostream>
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// template <class charT, class traits = char_traits<charT> >
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// class basic_ostream::sentry;
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// explicit sentry(basic_ostream<charT,traits>& os);
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#include <ostream>
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#include <cassert>
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int sync_called = 0;
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template <class CharT>
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struct testbuf1
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: public std::basic_streambuf<CharT>
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{
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testbuf1() {}
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protected:
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int virtual sync()
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{
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++sync_called;
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return 1;
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}
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};
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int main()
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{
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{
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std::ostream os((std::streambuf*)0);
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std::ostream::sentry s(os);
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assert(!bool(s));
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}
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{
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testbuf1<char> sb;
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std::ostream os(&sb);
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std::ostream::sentry s(os);
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assert(bool(s));
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}
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{
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testbuf1<char> sb;
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std::ostream os(&sb);
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testbuf1<char> sb2;
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std::ostream os2(&sb2);
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os.tie(&os2);
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assert(sync_called == 0);
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std::ostream::sentry s(os);
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assert(bool(s));
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assert(sync_called == 1);
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}
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}
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