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