53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// Minimal example of defining a predestructor for a class which
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// uses boost::signals2::deconstruct as its factory function.
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//
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// Copyright Frank Mori Hess 2009.
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// Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org
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#include <boost/shared_ptr.hpp>
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#include <boost/signals2/deconstruct.hpp>
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#include <iostream>
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namespace bs2 = boost::signals2;
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namespace mynamespace
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{
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class X
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{
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public:
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~X()
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{
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std::cout << "cruel world!" << std::endl;
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}
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/* This adl_predestruct friend function will be found by
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via argument-dependent lookup when using boost::signals2::deconstruct. */
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friend void adl_predestruct(X *)
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{
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std::cout << "Goodbye, ";
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}
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/* boost::signals2::deconstruct always requires an adl_postconstruct function
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which can be found via argument-dependent, so we define one which does nothing. */
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template<typename T> friend
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void adl_postconstruct(const boost::shared_ptr<T> &, X *)
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{}
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private:
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friend class bs2::deconstruct_access; // give boost::signals2::deconstruct access to private constructor
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// private constructor forces use of boost::signals2::deconstruct to create objects.
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X()
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{}
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};
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}
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int main()
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{
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{
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boost::shared_ptr<mynamespace::X> x = bs2::deconstruct<mynamespace::X>();
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}
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return 0;
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}
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