jiri/LA_library
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jiri 2006-04-03 02:01:45 +00:00
parent 1713bf0d4c
commit ad01874ff0
1 changed files with 11 additions and 9 deletions
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20
fourindex.h
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@ -168,13 +168,15 @@ private: //at the moment for simplicity forbid some operations, otherwise refere
fourindex_ext(const fourindex_ext &rhs);
fourindex_ext & operator=(const fourindex_ext &rhs);
protected:
int fd;
fourindexsymtype symmetry;
I nn;
unsigned int bufsize;
matel4stored<I,T> *buffer;
matel4stored<I,T> *current;
int fd;
unsigned int bufsize;
unsigned int nread;
fourindexsymtype symmetry;
I nn;
//methods
void tryread()
{
current=NULL;
@ -184,10 +186,10 @@ protected:
nread= r/sizeof(matel4stored<I,T>);
if(nread) current=buffer;
}
void next() { if(current && ++current - buffer >=nread) tryread(); }
void next() { if(current && (unsigned int) (++current - buffer) >=nread) tryread(); }
bool eof() {return !current;};
public:
fourindex_ext(const int file, const fourindexsymtype s=undefined_symmetry, const I nn=0, const unsigned int b=256) :nn(n),fd(file),symmetry(s),bufsize(b) {buffer = new matel4stored<I,T>[bufsize]; current=NULL; nread=0;}
fourindex_ext(const int file, const fourindexsymtype s=undefined_symmetry, const I n=0, const unsigned int b=256) :current(NULL),fd(file),bufsize(b),nread(0),symmetry(s),nn(n) {buffer = new matel4stored<I,T>[bufsize]; }
~fourindex_ext() {if(buffer) delete[] buffer;}
void setsymmetry(fourindexsymtype s) {symmetry=s;};
void rewind() {if(0!=lseek(fd,0L,SEEK_SET)) {perror("seek error"); la_error("cannot seek in fourindex_ext");} };
@ -205,13 +207,13 @@ public:
iterator(fourindex_ext *p): base(p) {};
~iterator() {};
bool operator!=(const iterator &rhs) const {return base!=rhs.base;} //should only be used for comparison with end()
iterator &operator++() {base->next(); if(base->eof()) return *this; else return NULL;}
iterator &operator++() {if(base) base->next(); if(base->eof()) base=NULL; return *this;}
iterator operator++(int) {laerror("postincrement not possible");}
const matel4stored<I,T> * operator->() const {return base->current;}
const matel4stored<I,T> & operator*() const {return *base->current;}
};
iterator begin() const {tryread(); if(!eof()) return this; else return NULL;}
iterator end() const {return NULL;}
iterator begin() {tryread(); if(!eof()) return this; else return NULL;}
iterator end() const {return iterator(NULL);}
//permiterator