| /************************************************************************ |
| * |
| * 27.streambuf.sgetn.stdcxx-1026.cpp - regression test for STDCXX-1026 |
| * |
| * http://issues.apache.org/jira/browse/STDCXX-1026 |
| * |
| * $Id$ |
| * |
| *************************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed |
| * with this work for additional information regarding copyright |
| * ownership. The ASF licenses this file to you under the Apache |
| * License, Version 2.0 (the "License"); you may not use this file |
| * except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. See the License for the specific language governing |
| * permissions and limitations under the License. |
| * |
| **************************************************************************/ |
| |
| #include <cassert> |
| #include <istream> |
| #include <streambuf> |
| |
| int main () |
| { |
| static int x = '0'; |
| |
| struct MyBuf : std::streambuf { |
| // unbuffered, always successfully reads one character |
| int_type underflow () { |
| assert (gptr () == egptr ()); |
| return x++; |
| } |
| } sb; |
| |
| // "endless" stream that never reaches EOF |
| std::istream endless (&sb); |
| |
| char s [4] = ""; |
| |
| endless.read (s, sizeof s); |
| |
| // expect to find stream in good state (i.e., not EOF) and |
| // to have extracted as many characters as requested with |
| // just as many calls to underflow() |
| assert (endless.good ()); |
| assert (sizeof s == endless.gcount ()); |
| assert ('0' == s [0] && '1' == s [1] && '2' == s [2] && '3' == s [3]); |
| } |