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

eric <>
Thu, 14 Jul 2011 04:37:02 -0700 (PDT)
On Jul 14, 1:24 am, "io_x" <a...@b.c.invalid> wrote:



"eric" <> ha scritto nel messaggionews:2a9f24c1-ac6=

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 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


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

#define u32 unsigned long
#define u32 unsigned int
#define u32 unsigned short
#error "Non posso compilare con questo sistema"

#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{

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

 fsck=fopen(a , "w+b");}

// better without this assignament but
// here somone has to print a message if fsck==-1


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

  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;


eric@eric-laptop:~/cppcookbook/ch8$ g++ Example8-3-2.cpp
Example8-3-2.cpp:14:2: error: #error "Non posso compilare con questo
Example8-3-2.cpp:47:2: error: =91u32' does not name a type
Example8-3-2.cpp: In constructor =91Socket::Socket(std::string&)':
Example8-3-2.cpp:37:24: error: invalid conversion from =91const char*'
to =91unsigned char*'
Example8-3-2.cpp:39:22: error: invalid conversion from =91unsigned
char*' to =91const char*'
Example8-3-2.cpp:39:22: error: initializing argument 1 of =91FILE*
fopen(const char*, const char*)'
Example8-3-2.cpp: At global scope:
Example8-3-2.cpp:61:1: error: =91u32' does not name a type
Example8-3-2.cpp: In function =91int main()':
Example8-3-2.cpp:73:26: error: =91sendMyData' was not declared in this
Thanks Io_x
and your suggestion
above is my compiler 's response of your test program. I will try to
learn more by myself. And at meantime,
 I guess it is not difficult for you to refine it if you think it is
necessary so it can fit on my system too.

of course, I always welcome whoever keep original class of book
authors expect, i.e. class HttpRequest
and its overloaded operator << in
void send(string soapMsg) {sock_ << soapMsg;}
to complete the fix

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