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

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"eric" <cneric12lin0@gmail.com> ha scritto nel messaggio
news:2a9f24c1-ac62-4d44-b518-e30a9877fc13@f39g2000prb.googlegroups.com...
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 {
public:
   Socket(const string& hostname) {}
};
class HttpRequest {
public:
  HttpRequest (const string& hostname) :
     sock_(new Socket(hostname)) {}
  void send(string soapMsg) {sock_ << soapMsg; }
  ~HttpRequest () {delete sock_;}
private:
   Socket* sock_;
};
void sendMyData(string soapMsg, string host) {
   HttpRequest req(host);
   req.send(soapMsg);
   // Nothing to do here, because when req goes out of scope
   // everything is cleaned up.
}
int main() {
   string s = "xml";
   sendMyData(s, "www.oreilly.com");
}
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my test compile fail as
----------------------------------
eric@eric-laptop:~/cppcookbook/ch8$ g++ Example8-3.cpp
Example8-3.cpp: In member function ?void
HttpRequest::send(std::string)?:
Example8-3.cpp:13:39: error: no match for ?operator<<? in
?((HttpRequest*)this)->HttpRequest::sock_ << soapMsg?
-------------------------------------------------------------
on both g++ 4.3.4 and 4.5.2
you can get its source code from
http://examples.oreilly.com/9780596007614/
to test by yourself

looking and thanks your help a lot in advance, Eric
========================================================

this here compile and run: i.e. print "xml" in "thisfile"
file in this directory;
this not send nothing in the net, just open and write a file

--------------------
// Example 8-3. Using constructors and destructors
#include <stdio.h>
#include <iostream>
#include <string>
#define u8 unsigned char

#if ULONG_MAX == 0xFFFFFFFF
#define u32 unsigned long
#elif UINT_MAX == 0xFFFFFFFF
#define u32 unsigned int
#elif USHRT_MAX == 0xFFFFFFFF
#define u32 unsigned short
#else
#error "Non posso compilare con questo sistema"
#endif

#define uns unsigned

// macro for function
#define P printf

// macro for keyWords
#define G goto
#define R return
#define W while
#define F for
#define T template
#define TN typename
#define S sizeof

using namespace std;

class Socket{
public:

Socket(string& hostname)
{u8 *a=hostname.c_str();

 fsck=fopen(a , "w+b");}

~Socket(){fsck=(FILE*)fclose(fsck);
// better without this assignament but
// here somone has to print a message if fsck==-1

}

 u32 send(string& soapMsg)
 {size_t k, slen;

  slen=soapMsg.length();
  F(k=0; k<slen ; ++k)
      if( fputc(soapMsg[k], fsck) == EOF ) break;
  if(k!=slen) R -1;
  R 0;
 }

 FILE* fsck;
};

u32 sendMyData(string soapMsg, string host) {
   Socket req(host);

   R req.send(soapMsg);

   // Nothing to do here, because when req goes out of scope
   // everything is cleaned up.
}

int main(void)
{string s="xml";
 sendMyData(s, "thisfile");

 R 0;
}