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| #include <iostream>
#include <string>
using namespace std;
class ModStream;
using TModStreamIO =int (ModStream::*)(char** buf,int sz);
using TModStreamOCF =int (ModStream::*)();
using TModStreamSeek=int (ModStream::*)(int pos);
// j'arrive a faire les using de class fonctor maintenant NA !
struct CB{
ModStream* ctx;
TModStreamIO _read;
TModStreamIO _write;
TModStreamOCF _open;
TModStreamOCF _close;
TModStreamOCF _flush;
TModStreamSeek _seek;
} cb;
class ServerStream{
public:
string type=""; // CTTI :p
CB cb;
ServerStream(){
cb.ctx=NULL;
}
virtual int write(char** buf, int sz){
return (cb.ctx->*cb._write)(buf, sz);
}
virtual int read(char** buf, int sz){
return (cb.ctx->*cb._read)(buf, sz);
}
};
class ModStream{
protected:
CB oldcb;
virtual int _read(char** buf,int sz){
if(!oldcb.ctx) return 0;
if(oldcb._read) return (oldcb.ctx->*oldcb._read)(buf,sz);
return -1;
}
virtual int _write(char** buf, int sz){
if(!oldcb.ctx) return 0;
if(oldcb._write) return (oldcb.ctx->*oldcb._write)(buf,sz);
return -1;
}
virtual int _open(){
if(!oldcb.ctx) return 0;
if(oldcb._open)return (oldcb.ctx->*oldcb._open)();
return -1;
}
virtual int _close(){
if(!oldcb.ctx) return 0;
if(oldcb._close) return (oldcb.ctx->*oldcb._close)();
return -1;
}
virtual int _flush(){
if(!oldcb.ctx) return 0;
if(oldcb._flush) return (oldcb.ctx->*oldcb._flush)();
return -1;
}
virtual int _seek(int pos){
if(!oldcb.ctx) return 0;
if(oldcb._seek) return (oldcb.ctx->*oldcb._seek)(pos);
return pos;
}
public:
ModStream(ServerStream *slf){
oldcb=slf->cb;
slf->cb.ctx=this;
slf->cb._open =(TModStreamOCF)&ModStream::_open;
slf->cb._close=(TModStreamOCF)&ModStream::_close;
slf->cb._flush=(TModStreamOCF)&ModStream::_open;
slf->cb._write=(TModStreamIO) &ModStream::_write;
slf->cb._read =(TModStreamIO) &ModStream::_read;
}
};
class FileStream:public ServerStream{
protected:
string filename;
bool opened=false;
public:
FileStream(){
cout << "File::"<<endl;
type="FileStream";
}
int open(string fn){
filename=fn;
cout << "File::open name="<<filename<<endl;
opened=true;
return (cb.ctx->*cb._open)();
}
int flush(string fn){
cout << "File::flush name="<<filename<<endl;
return (cb.ctx->*cb._open)();
}
int close(){
int err=(cb.ctx->*cb._close)();
cout << "File::close name="<<filename<<endl;
return err;
}
virtual int read(char** buf, int sz){
cout <<"File::read in "<<filename<<endl;
return ServerStream::read(buf,sz);
}
virtual int write(char** buf, int sz){
cout <<"File::write in "<<filename<<endl;
int err= ServerStream::write(buf,sz);
return err;
}
};
class Enc:public ModStream{
private:
string key;
bool opened=false;
protected:
virtual int _read(char** buf,int sz){
cout << "Enc::read"<<endl;
return ModStream::_read(buf,sz);
}
virtual int _write(char** buf, int sz){
cout << "Enc::write key="<<key <<endl;
return ModStream::_read(buf,sz);
}
virtual int _open(){
if(key.empty()) return -1;
opened=true;
cout << "Enc::open key="<<key << endl;
return ModStream::_open();
}
virtual int _close(){
cout << "Enc::close"<<endl;
return ModStream::_close();
}
virtual int _flush(){
cout << "Enc::flush"<<endl;
return ModStream::_flush();
}
virtual int _seek(int pos){
cout << "Enc::seek"<<endl;
return ModStream::_seek(pos);;
}
public:
Enc(ServerStream* slf):ModStream(slf){
slf->type+="+Enc";
cout << "Enc::"<<endl;
}
int setKey(string k){
if (opened) return -1;
key=k;
return 0;
}
};
class Zip:public ModStream{
public:
int ratio=9;
bool opened=false;
protected:
virtual int _read(char** buf,int sz){
cout << "Zip::read ratio="<<ratio<<endl;
return ModStream::_read(buf,sz);
}
virtual int _write(char** buf, int sz){
cout << "Zip::write"<<endl;
return ModStream::_read(buf,sz);
}
virtual int _open(){
cout << "Zip::open ratio="<<ratio<<endl;
return ModStream::_open();
}
virtual int _close(){
cout << "Zip::close"<<endl;
return ModStream::_close();
}
virtual int _flush(){
cout << "Zip::flush"<<endl;
return ModStream::_flush();
}
virtual int _seek(int pos){
cout << "Zip::seek"<<endl;
return ModStream::_seek(pos);
}
public:
Zip(ServerStream* slf):ModStream(slf){
slf->type+="+Zip";
cout << "Zip::"<<endl;
}
int setRatio(int r){
if(opened) return -1;
ratio=r;
return 0;
}
};
// ce que le ender user ecrira //
class MyStream:public FileStream,public Zip,public Enc{
public:
MyStream():Zip(this),Enc(this){};
};
int main(int argc, char** argv){
MyStream myStream;
cout << myStream.type << endl;
myStream.setKey("1234");
myStream.setRatio(5);
cout << myStream.open("totor.txt") << endl;
} |
j'ai trouvé un usage utile aux multi-class (a fuire si vous n'aimez pas les class fonctor)
Répondre avec citation
le patron de conception décorateur ("decorator" en anglais)
est-ce mieux ? je ne le sais pas.
ou simplement la supprimer parce qu'elle ne sert à rien, juste de "wrapper" et faire dériver tes décorateurs de 
tu as la notion de 
A méditer: La solution la plus simple est toujours la moins compliquée
Envoyé par Bousk
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