48 lines
1.3 KiB
C++
48 lines
1.3 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/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 <vector>
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#include <algorithm>
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struct v;
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BOOST_TYPEOF_REGISTER_TYPE(v) // Register before `bind this_` below.
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struct v {
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std::vector<int> nums;
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v(const std::vector<int>& numbers): nums(numbers) {}
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void change_sign_all(const std::vector<int>& indices) {
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void BOOST_LOCAL_FUNCTION(bind this_, int i) { // Bind object `this`.
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this_->nums.at(i) = -this_->nums.at(i);
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} BOOST_LOCAL_FUNCTION_NAME(complement)
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std::for_each(indices.begin(), indices.end(), complement);
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}
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};
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int main(void) {
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std::vector<int> n(3);
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n[0] = 1; n[1] = 2; n[2] = 3;
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std::vector<int> i(2);
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i[0] = 0; i[1] = 2; // Will change n[0] and n[2] but not n[1].
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v vn(n);
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vn.change_sign_all(i);
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BOOST_TEST(vn.nums.at(0) == -1);
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BOOST_TEST(vn.nums.at(1) == 2);
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BOOST_TEST(vn.nums.at(2) == -3);
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return boost::report_errors();
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}
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