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Library/boost/libs/local_function/example/phoenix_factorial_local.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/local_function.hpp> #include <boost/function.hpp> #include <boost/phoenix/core.hpp> #include <boost/phoenix/function.hpp> #include <boost/detail/lightweight_test.hpp> //[phoenix_factorial_local int main(void) { using boost::phoenix::arg_names::arg1; int BOOST_LOCAL_FUNCTION(int n) { // Unfortunately, monomorphic. return (n <= 0) ? 1 : n * factorial_impl(n - 1); } BOOST_LOCAL_FUNCTION_NAME(recursive factorial_impl) boost::phoenix::function< boost::function<int (int)> > factorial(factorial_impl); // Phoenix function from local function. int i = 4; BOOST_TEST(factorial(i)() == 24); // Call. BOOST_TEST(factorial(arg1)(i) == 24); // Lazy call. return boost::report_errors(); } //]