| 1 | // Function library |
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| 2 | |
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| 3 | // Copyright (C) 2001-2003 Douglas Gregor |
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| 4 | |
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| 5 | // Use, modification and distribution is subject to the Boost Software |
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| 6 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | |
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| 9 | // For more information, see http://www.boost.org/ |
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| 10 | |
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| 11 | |
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| 12 | #include <boost/function.hpp> |
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| 13 | #include <iostream> |
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| 14 | |
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| 15 | float mul_ints(int x, int y) { return ((float)x) * y; } |
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| 16 | struct int_div { |
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| 17 | float operator()(int x, int y) const { return ((float)x)/y; }; |
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| 18 | }; |
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| 19 | int main() |
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| 20 | { |
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| 21 | boost::function2<float, int, int> f; |
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| 22 | f = int_div(); |
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| 23 | std::cout << f(5, 3) << std::endl; |
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| 24 | if (f) |
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| 25 | std::cout << f(5, 3) << std::endl; |
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| 26 | else |
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| 27 | std::cout << "f has no target, so it is unsafe to call" << std::endl; |
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| 28 | f = 0; |
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| 29 | f = &mul_ints; |
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| 30 | |
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| 31 | return 0; |
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| 32 | } |
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| 33 | |
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