1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <streambuf> 11 12 // template <class charT, class traits = char_traits<charT> > 13 // class basic_streambuf; 14 15 // streamsize sgetn(char_type* s, streamsize n); 16 17 #include <streambuf> 18 #include <cassert> 19 20 int xsgetn_called = 0; 21 22 struct test 23 : public std::basic_streambuf<char> 24 { 25 test() {} 26 27 protected: 28 std::streamsize xsgetn(char_type*, std::streamsize) 29 { 30 ++xsgetn_called; 31 return 10; 32 } 33 }; 34 35 int main() 36 { 37 test t; 38 assert(xsgetn_called == 0); 39 assert(t.sgetn(0, 0) == 10); 40 assert(xsgetn_called == 1); 41 } 42
