| 1 | /*============================================================================= |
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| 2 | Phoenix V1.2.1 |
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| 3 | Copyright (c) 2001-2003 Joel de Guzman |
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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 | #include <vector> |
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| 10 | #include <algorithm> |
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| 11 | #include <iostream> |
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| 12 | #include <boost/spirit/phoenix/operators.hpp> |
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| 13 | #include <boost/spirit/phoenix/primitives.hpp> |
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| 14 | #include <boost/spirit/phoenix/composite.hpp> |
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| 15 | #include <boost/spirit/phoenix/special_ops.hpp> |
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| 16 | |
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| 17 | using namespace std; |
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| 18 | using namespace phoenix; |
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| 19 | |
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| 20 | ////////////////////////////////// |
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| 21 | template <typename CondT, typename TrueT, typename FalseT> |
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| 22 | struct if_else_composite { |
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| 23 | |
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| 24 | typedef if_else_composite<CondT, TrueT, FalseT> self_t; |
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| 25 | |
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| 26 | template <typename TupleT> |
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| 27 | struct result { |
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| 28 | |
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| 29 | typedef typename higher_rank< |
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| 30 | typename actor_result<TrueT, TupleT>::plain_type, |
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| 31 | typename actor_result<FalseT, TupleT>::plain_type |
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| 32 | >::type type; |
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| 33 | }; |
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| 34 | |
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| 35 | if_else_composite( |
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| 36 | CondT const& cond_, TrueT const& true__, FalseT const& false__) |
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| 37 | : cond(cond_), true_(true__), false_(false__) {} |
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| 38 | |
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| 39 | template <typename TupleT> |
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| 40 | typename actor_result<self_t, TupleT>::type |
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| 41 | eval(TupleT const& args) const |
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| 42 | { |
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| 43 | return cond.eval(args) ? true_.eval(args) : false_.eval(args); |
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| 44 | } |
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| 45 | |
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| 46 | CondT cond; TrueT true_; FalseT false_; // actors |
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| 47 | }; |
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| 48 | |
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| 49 | ////////////////////////////////// |
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| 50 | template <typename CondT, typename TrueT, typename FalseT> |
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| 51 | inline actor<if_else_composite< |
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| 52 | typename as_actor<CondT>::type, |
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| 53 | typename as_actor<TrueT>::type, |
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| 54 | typename as_actor<FalseT>::type> > |
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| 55 | if_else_(CondT const& cond, TrueT const& true_, FalseT const& false_) |
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| 56 | { |
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| 57 | typedef if_else_composite< |
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| 58 | typename as_actor<CondT>::type, |
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| 59 | typename as_actor<TrueT>::type, |
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| 60 | typename as_actor<FalseT>::type> |
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| 61 | result; |
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| 62 | |
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| 63 | return result( |
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| 64 | as_actor<CondT>::convert(cond), |
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| 65 | as_actor<TrueT>::convert(true_), |
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| 66 | as_actor<FalseT>::convert(false_)); |
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| 67 | } |
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| 68 | |
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| 69 | ////////////////////////////////// |
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| 70 | int |
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| 71 | main() |
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| 72 | { |
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| 73 | int init[] = { 2, 10, 4, 5, 1, 6, 8, 3, 9, 7 }; |
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| 74 | vector<int> c(init, init + 10); |
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| 75 | typedef vector<int>::iterator iterator; |
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| 76 | |
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| 77 | // Print all contents of an stl container c and |
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| 78 | // prefix " is odd" or " is even" appropriately. |
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| 79 | |
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| 80 | for_each(c.begin(), c.end(), |
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| 81 | cout |
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| 82 | << arg1 |
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| 83 | << if_else_(arg1 % 2 == 1, " is odd", " is even") |
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| 84 | << val('\n') |
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| 85 | ); |
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| 86 | |
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| 87 | return 0; |
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| 88 | } |
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