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// $Id: FilePtr.h 1897 2008-10-08 23:51:26Z hieuhoang1972 $
/* ---------------------------------------------------------------- */
/* Copyright 2005 (c) by RWTH Aachen - Lehrstuhl fuer Informatik VI */
/* Richard Zens */
/* ---------------------------------------------------------------- */
#ifndef FILEPTR_H_
#define FILEPTR_H_
#include "File.h"
namespace Moses
{
// smart pointer for on-demand loading from file
// requirement: T has a constructor T(FILE*)
template<typename T> class FilePtr {
public:
typedef T* Ptr;
private:
FILE* f;
OFF_T pos;
mutable Ptr t;
public:
FilePtr(FILE* f_=0,OFF_T p=0) : f(f_),pos(p),t(0) {}
~FilePtr() {}
void set(FILE* f_,OFF_T p) {f=f_;pos=p;}
void free() {delete t; t=0;}
T& operator* () {load();return *t;}
Ptr operator->() {load();return t;}
operator Ptr () {load();return t;}
const T& operator* () const {load();return *t;}
const Ptr operator->() const {load();return t;}
operator const Ptr () const {load();return t;}
// direct access to pointer, use with care!
Ptr getPtr() {return t;}
const Ptr getPtr() const {return t;}
operator bool() const {return (f && pos!=InvalidOffT);}
void load() const {
if(t) return;
if(f && pos!=InvalidOffT) {fSeek(f,pos); t=new T(f);}
}
};
}
#endif
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