// 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; }