56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// An example of defining a postconstructor for a class which
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// uses boost::signals2::deconstruct as its factory function.
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// This example expands on the basic postconstructor_ex1.cpp example
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// by passing arguments to the constructor and postconstructor.
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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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#include <sstream>
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#include <string>
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namespace bs2 = boost::signals2;
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namespace mynamespace
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{
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class Y
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{
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public:
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/* This adl_postconstruct function will be found
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via argument-dependent lookup when using boost::signals2::deconstruct. */
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template<typename T> friend
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void adl_postconstruct(const boost::shared_ptr<T> &, Y *y, const std::string &text)
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{
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y->_text_stream << text;
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}
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void print() const
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{
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std::cout << _text_stream.str() << std::endl;
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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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Y(const std::string &text)
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{
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_text_stream << text;
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}
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std::ostringstream _text_stream;
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};
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}
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int main()
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{
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boost::shared_ptr<mynamespace::Y> y = bs2::deconstruct<mynamespace::Y>("Hello, ").postconstruct("world!");
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y->print();
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return 0;
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}
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