30 lines
844 B
C++
30 lines
844 B
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/functional/overloaded_function
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#ifndef IDENTITY_HPP_
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#define IDENTITY_HPP_
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//[identity_typeof
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#include <boost/typeof/std/string.hpp> // No need to register `boost::function`.
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//]
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#include <boost/function.hpp>
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#include <string>
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//[identity_decls
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const std::string& identity_s(const std::string& x) // Function (as pointer).
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{ return x; }
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int identity_i_impl(int x) { return x; }
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int (&identity_i)(int) = identity_i_impl; // Function reference.
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double identity_d_impl(double x) { return x; }
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boost::function<double (double)> identity_d = identity_d_impl; // Functor.
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//]
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#endif // #include guard
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