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/* Abstract set data type as a C++ class.
Copyright (C) 2006-2021 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2018.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _GL_SET_HH
#define _GL_SET_HH
#include "gl_set.h"
#include "gl_xset.h"
#include <stdlib.h> /* because Gnulib's <stdlib.h> may '#define free ...' */
/* gl_Set is a C++ wrapper around the gl_set data type.
Its element type is 'ELTYPE *'.
It is merely a pointer, not a smart pointer. In other words:
it does NOT do reference-counting, and the destructor does nothing. */
template <class T> class gl_Set;
template <class ELTYPE>
class gl_Set<ELTYPE *>
{
public:
// ------------------------------ Constructors ------------------------------
gl_Set ()
: _ptr (NULL)
{}
/* Creates an empty set.
IMPLEMENTATION is one of GL_ARRAY_SET, GL_LINKEDHASH_SET, GL_HASH_SET.
EQUALS_FN is an element comparison function or NULL.
HASHCODE_FN is an element hash code function or NULL.
DISPOSE_FN is an element disposal function or NULL. */
gl_Set (gl_set_implementation_t implementation,
bool (*equals_fn) (ELTYPE * /*elt1*/, ELTYPE * /*elt2*/),
size_t (*hashcode_fn) (ELTYPE *),
void (*dispose_fn) (ELTYPE *))
: _ptr (gl_set_create_empty (implementation,
reinterpret_cast<gl_setelement_equals_fn>(equals_fn),
reinterpret_cast<gl_setelement_hashcode_fn>(hashcode_fn),
reinterpret_cast<gl_setelement_dispose_fn>(dispose_fn)))
{}
/* Copy constructor. */
gl_Set (const gl_Set& x)
{ _ptr = x._ptr; }
/* Assignment operator. */
gl_Set& operator= (const gl_Set& x)
{ _ptr = x._ptr; return *this; }
// ------------------------------- Destructor -------------------------------
~gl_Set ()
{ _ptr = NULL; }
// ----------------------- Read-only member functions -----------------------
/* Returns the current number of elements in the set. */
size_t size () const
{ return gl_set_size (_ptr); }
/* Searches whether an element is already in the set.
Returns true if found, or false if not present in the set. */
bool search (ELTYPE * elt) const
{ return gl_set_search (_ptr, elt); }
// ----------------------- Modifying member functions -----------------------
/* Adds an element to the set.
Returns true if it was not already in the set and added, false otherwise. */
bool add (ELTYPE * elt)
{ return gl_set_add (_ptr, elt); }
/* Removes an element from the set.
Returns true if it was found and removed. */
bool remove (ELTYPE * elt)
{ return gl_set_remove (_ptr, elt); }
/* Frees the entire set.
(But this call does not free the elements of the set. It only invokes
the DISPOSE_FN on each of the elements of the set.) */
void free ()
{ gl_set_free (_ptr); _ptr = NULL; }
// ------------------------------ Private stuff ------------------------------
private:
gl_set_t _ptr;
public:
// -------------------------------- Iterators --------------------------------
// Only a forward iterator.
// Does not implement the STL operations (++, *, and != .end()), but a simpler
// interface that needs only one virtual function call per iteration instead
// of three.
class iterator {
public:
/* If there is a next element, stores the next element in ELT, advances the
iterator and returns true. Otherwise, returns false. */
bool next (ELTYPE *& elt)
{
const void *next_elt;
bool has_next = gl_set_iterator_next (&_state, &next_elt);
if (has_next)
elt = static_cast<ELTYPE *>(next_elt);
return has_next;
}
~iterator ()
{ gl_set_iterator_free (&_state); }
#if defined __xlC__ || defined __HP_aCC || defined __SUNPRO_CC
public:
#else
private:
friend iterator gl_Set::begin ();
#endif
iterator (gl_set_t ptr)
: _state (gl_set_iterator (ptr))
{}
private:
gl_set_iterator_t _state;
};
/* Creates an iterator traversing the set.
The set's contents must not be modified while the iterator is in use,
except for removing the last returned element. */
iterator begin ()
{ return iterator (_ptr); }
};
#endif /* _GL_SET_HH */
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