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// <ostream> 11 12// template <class charT, class traits = char_traits<charT> > 13// class basic_ostream; 14 15// basic_ostream<charT,traits>& operator<< 16// (basic_ostream<charT,traits>& (*pf)(basic_ostream<charT,traits>&)) 17 18#include <ostream> 19#include <cassert> 20 21template <class CharT> 22class testbuf 23 : public std::basic_streambuf<CharT> 24{ 25 typedef std::basic_streambuf<CharT> base; 26 std::basic_string<CharT> str_; 27public: 28 testbuf() 29 { 30 } 31 32 std::basic_string<CharT> str() const 33 {return std::basic_string<CharT>(base::pbase(), base::pptr());} 34 35protected: 36 37 virtual typename base::int_type 38 overflow(typename base::int_type __c = base::traits_type::eof()) 39 { 40 if (__c != base::traits_type::eof()) 41 { 42 int n = str_.size(); 43 str_.push_back(__c); 44 str_.resize(str_.capacity()); 45 base::setp(const_cast<CharT*>(str_.data()), 46 const_cast<CharT*>(str_.data() + str_.size())); 47 base::pbump(n+1); 48 } 49 return __c; 50 } 51}; 52 53template <class CharT> 54std::basic_ostream<CharT>& 55f(std::basic_ostream<CharT>& os) 56{ 57 os << "testing..."; 58 return os; 59} 60 61int main() 62{ 63 { 64 testbuf<char> sb; 65 std::ostream os(&sb); 66 os << f; 67 assert(sb.str() == "testing..."); 68 } 69} 70