66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
|
// Copyright (c) 1994 James Clark
|
||
|
|
// See the file COPYING for copying permission.
|
||
|
|
|
||
|
|
#ifndef IQueue_INCLUDED
|
||
|
|
#define IQueue_INCLUDED 1
|
||
|
|
|
||
|
|
#include "Boolean.h"
|
||
|
|
#include "Link.h"
|
||
|
|
|
||
|
|
#ifdef SP_NAMESPACE
|
||
|
|
namespace SP_NAMESPACE {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
class IQueueBase {
|
||
|
|
public:
|
||
|
|
IQueueBase() : last_(0) { }
|
||
|
|
~IQueueBase() { }
|
||
|
|
Boolean empty() const { return last_ == 0; }
|
||
|
|
Link *get() {
|
||
|
|
Link *tem = last_->next_;
|
||
|
|
if (tem == last_)
|
||
|
|
last_ = 0;
|
||
|
|
else
|
||
|
|
last_->next_ = tem->next_;
|
||
|
|
return tem;
|
||
|
|
}
|
||
|
|
void append(Link *p) {
|
||
|
|
if (last_) {
|
||
|
|
p->next_ = last_->next_;
|
||
|
|
last_ = last_->next_ = p;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
last_ = p->next_ = p;
|
||
|
|
}
|
||
|
|
void swap(IQueueBase &with) {
|
||
|
|
Link *tem = last_;
|
||
|
|
last_ = with.last_;
|
||
|
|
with.last_ = tem;
|
||
|
|
}
|
||
|
|
private:
|
||
|
|
Link *last_;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
template<class T>
|
||
|
|
class IQueue : private IQueueBase {
|
||
|
|
public:
|
||
|
|
IQueue() { }
|
||
|
|
~IQueue() { clear(); }
|
||
|
|
void clear();
|
||
|
|
T *get() { return (T *)IQueueBase::get(); }
|
||
|
|
void append(T *p) { IQueueBase::append(p); }
|
||
|
|
Boolean empty() const { return IQueueBase::empty(); }
|
||
|
|
void swap(IQueue<T> &to) { IQueueBase::swap(to); }
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifdef SP_NAMESPACE
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* not IQueue_INCLUDED */
|
||
|
|
|
||
|
|
#ifdef SP_DEFINE_TEMPLATES
|
||
|
|
#include "IQueue.cxx"
|
||
|
|
#endif
|