61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
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// Copyright (c) 1994 James Clark
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// See the file COPYING for copying permission.
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#ifndef Owner_INCLUDED
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#define Owner_INCLUDED 1
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// A pointer that owns the object pointed to.
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// T must be of class type.
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// This is coded so that T need not yet have been defined.
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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template<class T>
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class Owner {
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public:
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Owner() : p_(0) { }
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Owner(T *p) : p_(p) { }
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virtual ~Owner();
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void operator=(T *p) {
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if (p_) del();
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p_ = p;
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}
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operator int() const { return p_ != 0; }
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T *pointer() const { return p_; }
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T *operator->() const { return p_; }
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T &operator*() const { return *p_; }
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void swap(Owner<T> &x) {
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T *tem = p_;
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p_ = x.p_;
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x.p_ = tem;
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}
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T *extract() {
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T *tem = p_;
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p_ = 0;
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return tem;
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}
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void clear() {
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if (p_) {
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del();
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p_ = 0;
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}
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}
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private:
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Owner(const Owner<T> &); // undefined
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void operator=(const Owner<T> &o); // undefined
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void del();
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T *p_;
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};
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* not Owner_INCLUDED */
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#ifdef SP_DEFINE_TEMPLATES
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#include "Owner.cxx"
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#endif
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