No match for 'operator<<' in '((HttpRequest*

eric <>
Wed, 13 Jul 2011 17:55:20 -0700 (PDT)
Dear advanced c/g++ programers:

  I have a simple program from book C++ cookbook, page 291, 8.3, Using
Constructors and Destructors to manage
resources (or RAII), but it can not get compiled in my g++
// Example 8-3. Using constructors and destructors
#include <iostream>
#include <string>
using namespace std;
class Socket {
   Socket(const string& hostname) {}
class HttpRequest {
  HttpRequest (const string& hostname) :
     sock_(new Socket(hostname)) {}
  void send(string soapMsg) {sock_ << soapMsg; }
  ~HttpRequest () {delete sock_;}
   Socket* sock_;
void sendMyData(string soapMsg, string host) {
   HttpRequest req(host);
   // Nothing to do here, because when req goes out of scope
   // everything is cleaned up.
int main() {
   string s = "xml";
   sendMyData(s, "");
my test compile fail as
eric@eric-laptop:~/cppcookbook/ch8$ g++ Example8-3.cpp
Example8-3.cpp: In member function =91void
Example8-3.cpp:13:39: error: no match for =91operator<<' in
=91((HttpRequest*)this)->HttpRequest::sock_ << soapMsg'
on both g++ 4.3.4 and 4.5.2
you can get its source code from
to test by yourself

looking and thanks your help a lot in advance, Eric

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