b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
1.4 KiB
C++
52 lines
1.4 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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// <strstream>
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// class strstreambuf
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// int_type underflow();
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#include <strstream>
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#include <cassert>
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struct test
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: public std::strstreambuf
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{
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typedef std::strstreambuf base;
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test(char* gnext_arg, std::streamsize n, char* pbeg_arg = 0)
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: base(gnext_arg, n, pbeg_arg) {}
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test(const char* gnext_arg, std::streamsize n)
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: base(gnext_arg, n) {}
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base::int_type underflow() {return base::underflow();}
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};
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int main()
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{
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{
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char buf[10] = "123";
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test sb(buf, 0, buf + 3);
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assert(sb.underflow() == '1');
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assert(sb.underflow() == '1');
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assert(sb.snextc() == '2');
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assert(sb.underflow() == '2');
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assert(sb.underflow() == '2');
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assert(sb.snextc() == '3');
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assert(sb.underflow() == '3');
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assert(sb.underflow() == '3');
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assert(sb.snextc() == EOF);
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assert(sb.underflow() == EOF);
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assert(sb.underflow() == EOF);
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sb.sputc('4');
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assert(sb.underflow() == '4');
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assert(sb.underflow() == '4');
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}
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}
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