118 lines
3.0 KiB
C++
118 lines
3.0 KiB
C++
/*==============================================================================
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Copyright (c) 2005-2010 Joel de Guzman
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Copyright (c) 2010 Thomas Heller
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#include <boost/phoenix/core.hpp>
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#include <boost/phoenix/function.hpp>
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#include <boost/phoenix/stl/container.hpp>
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#include <boost/phoenix/stl/algorithm.hpp>
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#include <vector>
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#include <iostream>
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namespace phoenix = boost::phoenix;
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using phoenix::actor;
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using phoenix::function;
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using phoenix::arg_names::arg1;
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struct size_impl
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{
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// result_of protocol:
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template <typename Sig>
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struct result;
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template <typename This, typename Container>
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struct result<This(Container)>
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{
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// Note, remove reference here, because Container can be anything
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typedef typename boost::remove_reference<Container>::type container_type;
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// The result will be size_type
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typedef typename container_type::size_type type;
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};
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template <typename Container>
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typename result<size_impl(Container const&)>::type
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operator()(Container const& container) const
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{
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return container.size();
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}
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};
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template <typename Expr>
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struct container_actor
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: actor<Expr>
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{
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typedef actor<Expr> base_type;
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typedef container_actor<Expr> that_type;
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container_actor( base_type const& base = base_type() )
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: base_type( base ) {}
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typename phoenix::expression::function<phoenix::stl::begin, that_type>::type const
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begin() const
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{
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return phoenix::begin(*this);
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}
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typename phoenix::expression::function<phoenix::stl::end, that_type>::type const
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end() const
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{
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return phoenix::end(*this);
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}
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typename phoenix::expression::function<size_impl, that_type>::type const
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size() const
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{
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function<size_impl> const f = size_impl();
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return f(*this);
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}
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typename phoenix::expression::function<phoenix::stl::max_size, that_type>::type const
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max_size() const
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{
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return phoenix::max_size(*this);
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}
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typename phoenix::expression::function<phoenix::stl::empty, that_type>::type const
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empty() const
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{
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return phoenix::empty(*this);
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}
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template <typename Container>
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typename phoenix::expression::function<phoenix::impl::swap, that_type, Container>::type const
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swap(actor<Container> const& expr) const
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{
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return phoenix::swap(*this, expr);
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}
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};
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template <typename Expr>
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container_actor<Expr> const
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container( actor<Expr> const& expr )
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{
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return expr;
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}
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int main()
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{
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container_actor<phoenix::expression::argument<1>::type> const con1;
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std::vector<int> v;
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v.push_back(0);
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v.push_back(1);
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v.push_back(2);
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v.push_back(3);
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std::cout << (container(arg1).size())(v) << " == " << v.size() << "\n";
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std::cout << (con1.size())(v) << " == " << v.size() << "\n";
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}
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