[c++]设计模式---桥接模式

#include <cstdlib>
#include <cstdio>
#include <iostream>

#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>

using namespace boost ;

class IOBuffer
{
private :
    class Internal ;
    shared_ptr <Internal> _internal ;
public :
    IOBuffer () ;
    IOBuffer ( std::string ) ;
    void showMessage () ;
} ;

class IOBuffer::Internal
{
private :
    std::string buffer ;
public :
    Internal ()
    {
        buffer = "not set yet" ;
    }
    Internal ( std::string Buffer )
    {
            buffer = Buffer ;
    }

    void showMessage ()
    {
        std::cout<< buffer << std::endl ;
    }
} ;

IOBuffer::IOBuffer ():_internal(new Internal )
{}

IOBuffer::IOBuffer ( std::string Buffer ) :_internal ( new Internal (Buffer))
{}

void IOBuffer::showMessage ()
    {
        _internal->showMessage() ;
    }

int main ( int c , char ** v )
{
    IOBuffer buf ;
    IOBuffer buf2 ("inuyasha1027") ;

    buf.showMessage() ;
    buf2.showMessage() ;

    system ("pause") ;
    return 0 ;
}