forked from boostorg/mpl
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
//-----------------------------------------------------------------------------
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// boost/mpl/apply_if.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_APPLY_IF_HPP_INCLUDED
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#define BOOST_MPL_APPLY_IF_HPP_INCLUDED
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#include "boost/mpl/if.hpp"
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#include "boost/mpl/aux_/apply.hpp"
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#include "boost/mpl/aux_/void_spec.hpp"
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#include "boost/mpl/aux_/lambda_support.hpp"
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namespace boost {
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namespace mpl {
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(F1)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(F2)
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>
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struct apply_if
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{
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private:
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typedef typename if_<C,F1,F2>::type nullary_func_;
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public:
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typedef typename BOOST_MPL_AUX_APPLY0(nullary_func_)::type type;
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BOOST_MPL_AUX_LAMBDA_SUPPORT(3,apply_if,(C,F1,F2))
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};
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// (almost) copy & paste in order to save one more
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// recursively nested template instantiation to user
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template<
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bool C
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, typename F1
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, typename F2
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>
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struct apply_if_c
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{
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private:
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typedef typename if_c<C,F1,F2>::type nullary_func_;
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public:
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typedef typename BOOST_MPL_AUX_APPLY0(nullary_func_)::type type;
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};
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BOOST_MPL_AUX_VOID_SPEC(3, apply_if)
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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_APPLY_IF_HPP_INCLUDED
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