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96 lines
2.8 KiB
96 lines
2.8 KiB
/*
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* Copyright (c) <2002-2009> <Jean-Philippe Barrette-LaPierre>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (curlpp), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef UTILSPP_CLONEPTR_HPP
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#define UTILSPP_CLONEPTR_HPP
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#include <cassert>
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#include <stdexcept>
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namespace utilspp
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{
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// This class is meant to manage a pointer. This class will
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// ensure that when we go out of scope, it will delete the
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// pointer.
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//
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// However, contrary to the std::unique_ptr, instead of
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// transfering the ownership on copy construction, it clones
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// the content. This means that we can have STL containers
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// that uses that class for managing the pointers.
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//
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// So, it means that the class we stores, needs a "clone"
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// member.
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template <typename T>
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class clone_ptr
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{
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public:
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clone_ptr() : value_(NULL) {}
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// This constructor takes ownership of the pointer.
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//
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// Note that it isn't explicit. This might be a
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// problem.
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clone_ptr(T * value) : value_(value) {}
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~clone_ptr() {if (value_) delete value_;}
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// This is the default constructor that takes his
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// value from cloning the content of the other
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// clone_ptr.
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clone_ptr(const clone_ptr & other)
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{value_ = other->clone();}
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T * operator->()
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{
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if (value_)
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return value_;
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throw std::runtime_error("using a null clone_ptr");
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}
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const T * operator->() const
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{
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assert(value_);
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return value_;
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}
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T * get() { return value_; }
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const T * get() const { return value_; }
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// This just releases the pointer. It means that the
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// pointer is no longer owned by the smart pointer.
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T * release()
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{
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T * r = value_;
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value_ = NULL;
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return r;
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}
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private:
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T * value_;
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};
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}
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#endif
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