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// Minimal example of defining a postconstructor for a class which
// uses boost::signals2::deconstruct as its factory function.
//
// Copyright Frank Mori Hess 2009.
// Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#include <boost/shared_ptr.hpp>
#include <boost/signals2/deconstruct.hpp>
#include <iostream>
namespace bs2 = boost::signals2;
namespace mynamespace
{
class X
{
public:
/* This adl_postconstruct function will be found
via argument-dependent lookup when using boost::signals2::deconstruct. */
template<typename T> friend
void adl_postconstruct(const boost::shared_ptr<T> &, X *)
{
std::cout << "world!" << std::endl;
}
private:
friend class bs2::deconstruct_access; // give boost::signals2::deconstruct access to private constructor
// private constructor forces use of boost::signals2::deconstruct to create objects.
X()
{
std::cout << "Hello, ";
}
};
}
int main()
{
// adl_postconstruct will be called during implicit conversion of return value to shared_ptr
boost::shared_ptr<mynamespace::X> x = bs2::deconstruct<mynamespace::X>();
return 0;
}
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