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Library/boost/libs/local_function/example/phoenix_factorial.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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// Copyright (C) 2009-2012 Lorenzo Caminiti // Distributed under the Boost Software License, Version 1.0 // (see accompanying file LICENSE_1_0.txt or a copy at // http://www.boost.org/LICENSE_1_0.txt) // Home at http://www.boost.org/libs/local_function #include <boost/phoenix/core.hpp> #include <boost/phoenix/function.hpp> #include <boost/detail/lightweight_test.hpp> //[phoenix_factorial struct factorial_impl { // Phoenix function from global functor. template<typename Sig> struct result; template<typename This, typename Arg> struct result<This (Arg)> : result<This (Arg const&)> {}; template<typename This, typename Arg> struct result<This (Arg&)> { typedef Arg type; }; template<typename Arg> // Polymorphic. Arg operator()(Arg n) const { return (n <= 0) ? 1 : n * (*this)(n - 1); } }; int main(void) { using boost::phoenix::arg_names::arg1; boost::phoenix::function<factorial_impl> factorial; int i = 4; BOOST_TEST(factorial(i)() == 24); // Call. BOOST_TEST(factorial(arg1)(i) == 24); // Lazy call. return boost::report_errors(); } //]