58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/local_function
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CXX11_VARIADIC_MACROS
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# error "variadic macros required"
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#else
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#include <boost/local_function.hpp>
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#include <boost/typeof/typeof.hpp>
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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#include <boost/detail/lightweight_test.hpp>
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#include <algorithm>
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#include <vector>
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struct calculator;
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BOOST_TYPEOF_REGISTER_TYPE(calculator) // Register before `bind this_` below.
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//[factorial
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struct calculator {
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std::vector<int> results;
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void factorials(const std::vector<int>& nums) {
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int BOOST_LOCAL_FUNCTION(bind this_, int num,
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bool recursion, default false) {
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int result = 0;
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if(num <= 0) result = 1;
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else result = num * factorial(num - 1, true); // Recursive call.
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if(!recursion) this_->results.push_back(result);
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return result;
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} BOOST_LOCAL_FUNCTION_NAME(recursive factorial) // Recursive.
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std::for_each(nums.begin(), nums.end(), factorial);
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}
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};
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//]
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int main(void) {
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std::vector<int> v(3);
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v[0] = 1; v[1] = 3; v[2] = 4;
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calculator calc;
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calc.factorials(v);
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BOOST_TEST(calc.results[0] == 1);
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BOOST_TEST(calc.results[1] == 6);
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BOOST_TEST(calc.results[2] == 24);
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return boost::report_errors();
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}
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#endif // VARIADIC_MACROS
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