| Jeff Thompson | ef2d5a4 | 2013-08-22 19:09:24 -0700 | [diff] [blame] | 1 | // -- select_functions.hpp -- Boost Lambda Library -------------------------- |
| 2 | |
| 3 | // Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) |
| 4 | // |
| 5 | // Distributed under the Boost Software License, Version 1.0. (See |
| 6 | // accompanying file LICENSE_1_0.txt or copy at |
| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
| 8 | // |
| 9 | // For more information, see http://www.boost.org |
| 10 | |
| 11 | |
| 12 | #ifndef BOOST_LAMBDA_SELECT_FUNCTIONS_HPP |
| 13 | #define BOOST_LAMBDA_SELECT_FUNCTIONS_HPP |
| 14 | |
| 15 | namespace ndnboost { |
| 16 | namespace lambda { |
| 17 | namespace detail { |
| 18 | |
| 19 | |
| 20 | // select functions ------------------------------- |
| 21 | template<class Any, CALL_TEMPLATE_ARGS> |
| 22 | inline Any& select(Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; } |
| 23 | |
| 24 | |
| 25 | template<class Arg, CALL_TEMPLATE_ARGS> |
| 26 | inline typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type |
| 27 | select ( const lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) { |
| 28 | return op.template call< |
| 29 | typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type |
| 30 | >(CALL_ACTUAL_ARGS); |
| 31 | } |
| 32 | template<class Arg, CALL_TEMPLATE_ARGS> |
| 33 | inline typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type |
| 34 | select ( lambda_functor<Arg>& op, CALL_FORMAL_ARGS) { |
| 35 | return op.template call< |
| 36 | typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type |
| 37 | >(CALL_ACTUAL_ARGS); |
| 38 | } |
| 39 | |
| 40 | // ------------------------------------------------------------------------ |
| 41 | // select functions where the return type is explicitly given |
| 42 | // Note: on many functions, this return type is just discarded. |
| 43 | // The select functions are inside a class template, and the return type |
| 44 | // is a class template argument. |
| 45 | // The first implementation used function templates with an explicitly |
| 46 | // specified template parameter. |
| 47 | // However, this resulted in ambiguous calls (at least with gcc 2.95.2 |
| 48 | // and edg 2.44). Not sure whether the compilers were right or wrong. |
| 49 | |
| 50 | template<class RET> struct r_select { |
| 51 | |
| 52 | // Any == RET |
| 53 | template<class Any, CALL_TEMPLATE_ARGS> |
| 54 | static |
| 55 | inline RET go (Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; } |
| 56 | |
| 57 | |
| 58 | template<class Arg, CALL_TEMPLATE_ARGS> |
| 59 | static |
| 60 | inline RET go (const lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) { |
| 61 | return op.template call<RET>(CALL_ACTUAL_ARGS); |
| 62 | } |
| 63 | template<class Arg, CALL_TEMPLATE_ARGS> |
| 64 | static |
| 65 | inline RET go (lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) { |
| 66 | return op.template call<RET>(CALL_ACTUAL_ARGS); |
| 67 | } |
| 68 | }; |
| 69 | |
| 70 | } // namespace detail |
| 71 | } // namespace lambda |
| 72 | } // namespace ndnboost |
| 73 | |
| 74 | #endif |