mirror of
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549 lines
18 KiB
C++
549 lines
18 KiB
C++
// ------------------------------------------------------------------------------
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// Copyright (c) 2000 Cadenza New Zealand Ltd
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// Distributed under the Boost Software License, Version 1.0. (See accompany-
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// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// ------------------------------------------------------------------------------
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// Boost functional.hpp header file
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// See http://www.boost.org/libs/functional for documentation.
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// ------------------------------------------------------------------------------
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// $Id$
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// ------------------------------------------------------------------------------
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#ifndef BOOST_FUNCTIONAL_HPP
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#define BOOST_FUNCTIONAL_HPP
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#include <boost/config.hpp>
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#include <boost/call_traits.hpp>
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#include <functional>
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namespace boost
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{
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// --------------------------------------------------------------------------
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// The following traits classes allow us to avoid the need for ptr_fun
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// because the types of arguments and the result of a function can be
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// deduced.
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//
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// In addition to the standard types defined in unary_function and
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// binary_function, we add
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//
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// - function_type, the type of the function or function object itself.
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//
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// - param_type, the type that should be used for passing the function or
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// function object as an argument.
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// --------------------------------------------------------------------------
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namespace detail
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{
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template <class Operation>
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struct unary_traits_imp;
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template <class Operation>
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struct unary_traits_imp<Operation*>
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{
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typedef Operation function_type;
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typedef const function_type & param_type;
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typedef typename Operation::result_type result_type;
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typedef typename Operation::argument_type argument_type;
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};
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template <class R, class A>
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struct unary_traits_imp<R(*)(A)>
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{
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typedef R (*function_type)(A);
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typedef R (*param_type)(A);
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typedef R result_type;
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typedef A argument_type;
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};
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template <class Operation>
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struct binary_traits_imp;
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template <class Operation>
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struct binary_traits_imp<Operation*>
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{
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typedef Operation function_type;
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typedef const function_type & param_type;
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typedef typename Operation::result_type result_type;
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typedef typename Operation::first_argument_type first_argument_type;
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typedef typename Operation::second_argument_type second_argument_type;
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};
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template <class R, class A1, class A2>
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struct binary_traits_imp<R(*)(A1,A2)>
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{
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typedef R (*function_type)(A1,A2);
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typedef R (*param_type)(A1,A2);
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typedef R result_type;
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typedef A1 first_argument_type;
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typedef A2 second_argument_type;
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};
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} // namespace detail
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template <class Operation>
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struct unary_traits
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{
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typedef typename detail::unary_traits_imp<Operation*>::function_type function_type;
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typedef typename detail::unary_traits_imp<Operation*>::param_type param_type;
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typedef typename detail::unary_traits_imp<Operation*>::result_type result_type;
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typedef typename detail::unary_traits_imp<Operation*>::argument_type argument_type;
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};
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template <class R, class A>
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struct unary_traits<R(*)(A)>
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{
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typedef R (*function_type)(A);
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typedef R (*param_type)(A);
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typedef R result_type;
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typedef A argument_type;
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};
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template <class Operation>
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struct binary_traits
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{
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typedef typename detail::binary_traits_imp<Operation*>::function_type function_type;
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typedef typename detail::binary_traits_imp<Operation*>::param_type param_type;
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typedef typename detail::binary_traits_imp<Operation*>::result_type result_type;
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typedef typename detail::binary_traits_imp<Operation*>::first_argument_type first_argument_type;
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typedef typename detail::binary_traits_imp<Operation*>::second_argument_type second_argument_type;
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};
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template <class R, class A1, class A2>
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struct binary_traits<R(*)(A1,A2)>
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{
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typedef R (*function_type)(A1,A2);
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typedef R (*param_type)(A1,A2);
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typedef R result_type;
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typedef A1 first_argument_type;
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typedef A2 second_argument_type;
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};
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#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// --------------------------------------------------------------------------
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// If we have no partial specialisation available, decay to a situation
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// that is no worse than in the Standard, i.e., ptr_fun will be required.
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// --------------------------------------------------------------------------
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template <class Operation>
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struct unary_traits
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{
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typedef Operation function_type;
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typedef const Operation& param_type;
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typedef typename Operation::result_type result_type;
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typedef typename Operation::argument_type argument_type;
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};
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template <class Operation>
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struct binary_traits
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{
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typedef Operation function_type;
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typedef const Operation & param_type;
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typedef typename Operation::result_type result_type;
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typedef typename Operation::first_argument_type first_argument_type;
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typedef typename Operation::second_argument_type second_argument_type;
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// --------------------------------------------------------------------------
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// unary_negate, not1
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// --------------------------------------------------------------------------
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template <class Predicate>
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class unary_negate
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: public std::unary_function<typename unary_traits<Predicate>::argument_type,bool>
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{
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public:
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explicit unary_negate(typename unary_traits<Predicate>::param_type x)
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:
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pred(x)
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{}
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bool operator()(typename call_traits<typename unary_traits<Predicate>::argument_type>::param_type x) const
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{
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return !pred(x);
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}
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private:
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typename unary_traits<Predicate>::function_type pred;
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};
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template <class Predicate>
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unary_negate<Predicate> not1(const Predicate &pred)
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{
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// The cast is to placate Borland C++Builder in certain circumstances.
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// I don't think it should be necessary.
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return unary_negate<Predicate>((typename unary_traits<Predicate>::param_type)pred);
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}
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template <class Predicate>
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unary_negate<Predicate> not1(Predicate &pred)
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{
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return unary_negate<Predicate>(pred);
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}
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// --------------------------------------------------------------------------
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// binary_negate, not2
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// --------------------------------------------------------------------------
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template <class Predicate>
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class binary_negate
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: public std::binary_function<typename binary_traits<Predicate>::first_argument_type,
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typename binary_traits<Predicate>::second_argument_type,
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bool>
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{
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public:
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explicit binary_negate(typename binary_traits<Predicate>::param_type x)
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:
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pred(x)
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{}
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bool operator()(typename call_traits<typename binary_traits<Predicate>::first_argument_type>::param_type x,
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typename call_traits<typename binary_traits<Predicate>::second_argument_type>::param_type y) const
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{
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return !pred(x,y);
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}
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private:
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typename binary_traits<Predicate>::function_type pred;
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};
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template <class Predicate>
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binary_negate<Predicate> not2(const Predicate &pred)
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{
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// The cast is to placate Borland C++Builder in certain circumstances.
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// I don't think it should be necessary.
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return binary_negate<Predicate>((typename binary_traits<Predicate>::param_type)pred);
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}
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template <class Predicate>
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binary_negate<Predicate> not2(Predicate &pred)
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{
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return binary_negate<Predicate>(pred);
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}
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// --------------------------------------------------------------------------
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// binder1st, bind1st
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// --------------------------------------------------------------------------
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template <class Operation>
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class binder1st
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: public std::unary_function<typename binary_traits<Operation>::second_argument_type,
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typename binary_traits<Operation>::result_type>
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{
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public:
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binder1st(typename binary_traits<Operation>::param_type x,
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typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type y)
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:
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op(x), value(y)
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{}
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typename binary_traits<Operation>::result_type
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operator()(typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type x) const
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{
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return op(value, x);
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}
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protected:
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typename binary_traits<Operation>::function_type op;
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typename binary_traits<Operation>::first_argument_type value;
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};
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template <class Operation>
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inline binder1st<Operation> bind1st(const Operation &op,
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typename call_traits<
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typename binary_traits<Operation>::first_argument_type
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>::param_type x)
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{
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// The cast is to placate Borland C++Builder in certain circumstances.
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// I don't think it should be necessary.
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return binder1st<Operation>((typename binary_traits<Operation>::param_type)op, x);
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}
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template <class Operation>
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inline binder1st<Operation> bind1st(Operation &op,
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typename call_traits<
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typename binary_traits<Operation>::first_argument_type
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>::param_type x)
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{
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return binder1st<Operation>(op, x);
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}
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// --------------------------------------------------------------------------
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// binder2nd, bind2nd
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// --------------------------------------------------------------------------
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template <class Operation>
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class binder2nd
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: public std::unary_function<typename binary_traits<Operation>::first_argument_type,
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typename binary_traits<Operation>::result_type>
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{
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public:
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binder2nd(typename binary_traits<Operation>::param_type x,
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typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type y)
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:
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op(x), value(y)
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{}
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typename binary_traits<Operation>::result_type
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operator()(typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type x) const
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{
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return op(x, value);
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}
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protected:
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typename binary_traits<Operation>::function_type op;
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typename binary_traits<Operation>::second_argument_type value;
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};
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template <class Operation>
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inline binder2nd<Operation> bind2nd(const Operation &op,
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typename call_traits<
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typename binary_traits<Operation>::second_argument_type
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>::param_type x)
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{
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// The cast is to placate Borland C++Builder in certain circumstances.
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// I don't think it should be necessary.
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return binder2nd<Operation>((typename binary_traits<Operation>::param_type)op, x);
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}
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template <class Operation>
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inline binder2nd<Operation> bind2nd(Operation &op,
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typename call_traits<
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typename binary_traits<Operation>::second_argument_type
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>::param_type x)
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{
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return binder2nd<Operation>(op, x);
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}
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// --------------------------------------------------------------------------
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// mem_fun, etc
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// --------------------------------------------------------------------------
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template <class S, class T>
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class mem_fun_t : public std::unary_function<T*, S>
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{
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public:
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explicit mem_fun_t(S (T::*p)())
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:
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ptr(p)
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{}
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S operator()(T* p) const
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{
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return (p->*ptr)();
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}
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private:
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S (T::*ptr)();
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};
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template <class S, class T, class A>
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class mem_fun1_t : public std::binary_function<T*, A, S>
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{
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public:
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explicit mem_fun1_t(S (T::*p)(A))
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:
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ptr(p)
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{}
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S operator()(T* p, typename call_traits<A>::param_type x) const
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{
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return (p->*ptr)(x);
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}
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private:
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S (T::*ptr)(A);
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};
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template <class S, class T>
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class const_mem_fun_t : public std::unary_function<const T*, S>
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{
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public:
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explicit const_mem_fun_t(S (T::*p)() const)
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:
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ptr(p)
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{}
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S operator()(const T* p) const
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{
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return (p->*ptr)();
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}
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private:
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S (T::*ptr)() const;
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};
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template <class S, class T, class A>
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class const_mem_fun1_t : public std::binary_function<const T*, A, S>
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{
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public:
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explicit const_mem_fun1_t(S (T::*p)(A) const)
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:
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ptr(p)
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{}
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S operator()(const T* p, typename call_traits<A>::param_type x) const
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{
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return (p->*ptr)(x);
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}
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private:
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S (T::*ptr)(A) const;
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};
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template<class S, class T>
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inline mem_fun_t<S,T> mem_fun(S (T::*f)())
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{
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return mem_fun_t<S,T>(f);
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}
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template<class S, class T, class A>
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inline mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A))
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{
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return mem_fun1_t<S,T,A>(f);
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}
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#ifndef BOOST_NO_POINTER_TO_MEMBER_CONST
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template<class S, class T>
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inline const_mem_fun_t<S,T> mem_fun(S (T::*f)() const)
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{
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return const_mem_fun_t<S,T>(f);
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}
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template<class S, class T, class A>
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inline const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const)
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{
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return const_mem_fun1_t<S,T,A>(f);
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}
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#endif // BOOST_NO_POINTER_TO_MEMBER_CONST
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// --------------------------------------------------------------------------
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// mem_fun_ref, etc
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// --------------------------------------------------------------------------
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template <class S, class T>
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class mem_fun_ref_t : public std::unary_function<T&, S>
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{
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public:
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explicit mem_fun_ref_t(S (T::*p)())
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:
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ptr(p)
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{}
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S operator()(T& p) const
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{
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return (p.*ptr)();
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}
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private:
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S (T::*ptr)();
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};
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template <class S, class T, class A>
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class mem_fun1_ref_t : public std::binary_function<T&, A, S>
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{
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public:
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explicit mem_fun1_ref_t(S (T::*p)(A))
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:
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ptr(p)
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{}
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S operator()(T& p, typename call_traits<A>::param_type x) const
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{
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return (p.*ptr)(x);
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}
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private:
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S (T::*ptr)(A);
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};
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template <class S, class T>
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class const_mem_fun_ref_t : public std::unary_function<const T&, S>
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{
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public:
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explicit const_mem_fun_ref_t(S (T::*p)() const)
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:
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ptr(p)
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{}
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S operator()(const T &p) const
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{
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return (p.*ptr)();
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}
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private:
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S (T::*ptr)() const;
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};
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template <class S, class T, class A>
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class const_mem_fun1_ref_t : public std::binary_function<const T&, A, S>
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{
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public:
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explicit const_mem_fun1_ref_t(S (T::*p)(A) const)
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:
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ptr(p)
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{}
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S operator()(const T& p, typename call_traits<A>::param_type x) const
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{
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return (p.*ptr)(x);
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}
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private:
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S (T::*ptr)(A) const;
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};
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template<class S, class T>
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inline mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)())
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{
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return mem_fun_ref_t<S,T>(f);
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}
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template<class S, class T, class A>
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inline mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A))
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{
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return mem_fun1_ref_t<S,T,A>(f);
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}
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#ifndef BOOST_NO_POINTER_TO_MEMBER_CONST
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template<class S, class T>
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inline const_mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)() const)
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{
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return const_mem_fun_ref_t<S,T>(f);
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}
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template<class S, class T, class A>
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inline const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const)
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{
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return const_mem_fun1_ref_t<S,T,A>(f);
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}
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#endif // BOOST_NO_POINTER_TO_MEMBER_CONST
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// --------------------------------------------------------------------------
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// ptr_fun
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// --------------------------------------------------------------------------
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template <class Arg, class Result>
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class pointer_to_unary_function : public std::unary_function<Arg,Result>
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{
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public:
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explicit pointer_to_unary_function(Result (*f)(Arg))
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:
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func(f)
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{}
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Result operator()(typename call_traits<Arg>::param_type x) const
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{
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return func(x);
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}
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private:
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Result (*func)(Arg);
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};
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template <class Arg, class Result>
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inline pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg))
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{
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return pointer_to_unary_function<Arg,Result>(f);
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}
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template <class Arg1, class Arg2, class Result>
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class pointer_to_binary_function : public std::binary_function<Arg1,Arg2,Result>
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{
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public:
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explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2))
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:
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func(f)
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{}
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Result operator()(typename call_traits<Arg1>::param_type x, typename call_traits<Arg2>::param_type y) const
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{
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return func(x,y);
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}
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private:
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Result (*func)(Arg1, Arg2);
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};
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template <class Arg1, class Arg2, class Result>
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inline pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1, Arg2))
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{
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return pointer_to_binary_function<Arg1,Arg2,Result>(f);
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}
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} // namespace boost
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#endif
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