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https://github.com/boostorg/openmethod.git
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103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
// Copyright (c) 2018-2025 Jean-Louis Leroy
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef LIBRARY_NAME
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#ifdef _MSC_VER
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#define LIBRARY_NAME "shared.dll"
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#else
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#define LIBRARY_NAME "libshared.so"
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#endif
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#endif
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// tag::before[]
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// dynamic_main.cpp
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#include "animals.hpp"
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#include <boost/openmethod.hpp>
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#include <boost/openmethod/initialize.hpp>
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#include <boost/dll/shared_library.hpp>
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#include <boost/dll/runtime_symbol_info.hpp>
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#include <iostream>
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#include <memory>
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using namespace boost::openmethod::aliases;
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struct Cow : Herbivore {};
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struct Wolf : Carnivore {};
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BOOST_OPENMETHOD_CLASSES(Animal, Herbivore, Cow, Wolf, Carnivore);
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BOOST_OPENMETHOD_OVERRIDE(
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meet, (virtual_ptr<Animal>, virtual_ptr<Animal>), std::string) {
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return "greet";
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}
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// tag::load[]
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int main() {
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// end::load[]
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// end::unload[]
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std::cout << "Before loading the shared library.\n";
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boost::openmethod::initialize();
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std::cout << "cow meets wolf -> "
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<< meet(*std::make_unique<Cow>(), *std::make_unique<Wolf>())
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<< "\n"; // greet
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std::cout << "wolf meets cow -> "
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<< meet(*std::make_unique<Wolf>(), *std::make_unique<Cow>())
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<< "\n"; // greet
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// to be continued...
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// end::before[]
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// tag::load[]
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// ...
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std::cout << "\nAfter loading the shared library.\n";
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boost::dll::shared_library lib(
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boost::dll::program_location().parent_path() / LIBRARY_NAME,
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boost::dll::load_mode::rtld_now);
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boost::openmethod::initialize();
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std::cout << "cow meets wolf -> "
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<< meet(*std::make_unique<Cow>(), *std::make_unique<Wolf>())
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<< "\n"; // run
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std::cout << "wolf meets cow -> "
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<< meet(*std::make_unique<Wolf>(), *std::make_unique<Cow>())
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<< "\n"; // hunt
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auto make_tiger = lib.get<Animal*()>("make_tiger");
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std::cout << "cow meets tiger -> "
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<< meet(
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*std::make_unique<Cow>(),
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*std::unique_ptr<Animal>(make_tiger()))
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<< "\n"; // hunt
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// end::load[]
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// tag::unload[]
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// ...
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std::cout << "\nAfter unloading the shared library.\n";
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lib.unload();
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boost::openmethod::initialize();
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std::cout << "cow meets wolf -> "
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<< meet(*std::make_unique<Cow>(), *std::make_unique<Wolf>())
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<< "\n"; // greet
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std::cout << "wolf meets cow -> "
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<< meet(*std::make_unique<Wolf>(), *std::make_unique<Cow>())
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<< "\n"; // greet
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// tag::before[]
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// tag::load[]
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// tag::unload[]
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return 0;
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}
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// end::before[]
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// end::load[]
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// end::unload[]
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