bc8d3f97eb
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
3.3 KiB
C++
129 lines
3.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <istream>
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// template <class charT, class traits = char_traits<charT> >
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// class basic_istream::sentry;
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// explicit sentry(basic_istream<charT,traits>& is, bool noskipws = false);
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#include <istream>
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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 testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_string<CharT> string_type;
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typedef std::basic_streambuf<CharT> base;
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private:
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string_type str_;
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public:
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testbuf() {}
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testbuf(const string_type& str)
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: str_(str)
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{
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base::setg(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()) + str_.size());
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}
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CharT* eback() const {return base::eback();}
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CharT* gptr() const {return base::gptr();}
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CharT* egptr() const {return base::egptr();}
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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::istream is((testbuf<char>*)0);
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std::istream::sentry sen(is, true);
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assert(!(bool)sen);
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assert(!is.good());
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assert(is.gcount() == 0);
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assert(sync_called == 0);
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}
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{
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std::wistream is((testbuf<wchar_t>*)0);
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std::wistream::sentry sen(is, true);
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assert(!(bool)sen);
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assert(!is.good());
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assert(is.gcount() == 0);
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assert(sync_called == 0);
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}
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{
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testbuf<char> sb(" 123");
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std::istream is(&sb);
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std::istream::sentry sen(is, true);
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assert((bool)sen);
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assert(is.good());
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assert(is.gcount() == 0);
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback());
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}
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{
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testbuf<wchar_t> sb(L" 123");
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std::wistream is(&sb);
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std::wistream::sentry sen(is, true);
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assert((bool)sen);
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assert(is.good());
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assert(is.gcount() == 0);
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback());
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}
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{
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testbuf<char> sb(" 123");
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std::istream is(&sb);
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std::istream::sentry sen(is);
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assert((bool)sen);
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assert(is.good());
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback() + 3);
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}
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{
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testbuf<wchar_t> sb(L" 123");
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std::wistream is(&sb);
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std::wistream::sentry sen(is);
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assert((bool)sen);
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assert(is.good());
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback() + 3);
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}
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{
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testbuf<char> sb(" ");
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std::istream is(&sb);
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std::istream::sentry sen(is);
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assert(!(bool)sen);
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assert(is.fail());
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assert(is.eof());
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback() + 6);
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}
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{
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testbuf<char> sb(" ");
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std::istream is(&sb);
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std::istream::sentry sen(is, true);
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assert((bool)sen);
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assert(is.good());
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assert(sync_called == 0);
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assert(sb.gptr() == sb.eback());
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}
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}
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