1 //-----------------------------------------------------------------------------
2 // boost/mpl/apply_if.hpp header file
3 // See http://www.boost.org for updates, documentation, and revision history.
4 //-----------------------------------------------------------------------------
6 // Copyright (c) 2000-02
9 // Permission to use, copy, modify, distribute and sell this software
10 // and its documentation for any purpose is hereby granted without fee,
11 // provided that the above copyright notice appears in all copies and
12 // that both the copyright notice and this permission notice appear in
13 // supporting documentation. No representations are made about the
14 // suitability of this software for any purpose. It is provided "as is"
15 // without express or implied warranty.
17 #ifndef BOOST_MPL_APPLY_IF_HPP_INCLUDED
18 #define BOOST_MPL_APPLY_IF_HPP_INCLUDED
20 #include "boost/mpl/if.hpp"
21 #include "boost/mpl/aux_/apply.hpp"
22 #include "boost/mpl/aux_/void_spec.hpp"
23 #include "boost/mpl/aux_/lambda_support.hpp"
29 typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C)
30 , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(F1)
31 , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(F2)
36 typedef typename if_<C,F1,F2>::type nullary_func_;
39 typedef typename BOOST_MPL_AUX_APPLY0(nullary_func_)::type type;
40 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,apply_if,(C,F1,F2))
43 // (almost) copy & paste in order to save one more
44 // recursively nested template instantiation to user
53 typedef typename if_c<C,F1,F2>::type nullary_func_;
56 typedef typename BOOST_MPL_AUX_APPLY0(nullary_func_)::type type;
59 BOOST_MPL_AUX_VOID_SPEC(3, apply_if)
64 #endif // BOOST_MPL_APPLY_IF_HPP_INCLUDED