389 lines
15 KiB
C++
389 lines
15 KiB
C++
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// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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// File : $RCSfile$
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//
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// Version : $Revision$
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//
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// Description : named function parameters library
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// ***************************************************************************
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#ifndef BOOST_TEST_UTILS_NAMED_PARAM
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#define BOOST_TEST_UTILS_NAMED_PARAM
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// Boost
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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// Boost.Test
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#include <boost/test/utils/rtti.hpp>
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#include <boost/test/utils/assign_op.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/test/detail/throw_exception.hpp>
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// Boost
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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namespace boost {
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namespace nfp { // named function parameters
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// ************************************************************************** //
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// ************** forward declarations ************** //
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// ************************************************************************** //
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template<typename unique_id, bool required> struct keyword;
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template<typename T, typename unique_id, bool required = false> struct typed_keyword;
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template<typename T, typename unique_id, typename RefType=T&> struct named_parameter;
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template<typename NP1,typename NP2> struct named_parameter_combine;
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// ************************************************************************** //
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// ************** is_named_param_pack ************** //
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// ************************************************************************** //
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/// is_named_param_pack<T>::value is true if T is parameters pack
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template<typename T>
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struct is_named_param_pack : public mpl::false_ {};
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template<typename T, typename unique_id, typename RefType>
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struct is_named_param_pack<named_parameter<T,unique_id,RefType> > : public mpl::true_ {};
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template<typename NP, typename Rest>
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struct is_named_param_pack<named_parameter_combine<NP,Rest> > : public mpl::true_ {};
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// ************************************************************************** //
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// ************** param_type ************** //
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// ************************************************************************** //
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/// param_type<Params,Keyword,Default>::type is is the type of the parameter
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/// corresponding to the Keyword (if parameter is present) or Default
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template<typename NP, typename Keyword, typename DefaultType=void>
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struct param_type
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: mpl::if_<typename is_same<typename NP::id,typename Keyword::id>::type,
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typename remove_cv<typename NP::data_type>::type,
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DefaultType> {};
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template<typename NP, typename Rest, typename Keyword, typename DefaultType>
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struct param_type<named_parameter_combine<NP,Rest>,Keyword,DefaultType>
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: mpl::if_<typename is_same<typename NP::id,typename Keyword::id>::type,
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typename remove_cv<typename NP::data_type>::type,
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typename param_type<Rest,Keyword,DefaultType>::type> {};
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// ************************************************************************** //
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// ************** has_param ************** //
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// ************************************************************************** //
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/// has_param<Params,Keyword>::value is true id Params has parameter corresponding
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/// to the Keyword
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template<typename NP, typename Keyword>
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struct has_param : is_same<typename NP::id,typename Keyword::id> {};
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template<typename NP, typename Rest, typename Keyword>
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struct has_param<named_parameter_combine<NP,Rest>,Keyword>
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: mpl::or_<typename is_same<typename NP::id,typename Keyword::id>::type,
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typename has_param<Rest,Keyword>::type> {};
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// ************************************************************************** //
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// ************** access_to_invalid_parameter ************** //
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// ************************************************************************** //
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namespace nfp_detail {
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struct access_to_invalid_parameter {};
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//____________________________________________________________________________//
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inline void
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report_access_to_invalid_parameter( bool v )
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{
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BOOST_TEST_I_ASSRT( !v, access_to_invalid_parameter() );
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}
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} // namespace nfp_detail
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// ************************************************************************** //
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// ************** nil ************** //
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// ************************************************************************** //
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struct nil {
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template<typename T>
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#if defined(__GNUC__) || defined(__HP_aCC) || defined(__EDG__) || defined(__SUNPRO_CC)
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operator T() const
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#else
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operator T const&() const
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#endif
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{ nfp_detail::report_access_to_invalid_parameter(true); static T* v = 0; return *v; }
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template<typename T>
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T any_cast() const
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{ nfp_detail::report_access_to_invalid_parameter(true); static typename remove_reference<T>::type* v = 0; return *v; }
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template<typename Arg1>
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nil operator()( Arg1 const& )
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{ nfp_detail::report_access_to_invalid_parameter(true); return nil(); }
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template<typename Arg1,typename Arg2>
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nil operator()( Arg1 const&, Arg2 const& )
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{ nfp_detail::report_access_to_invalid_parameter(true); return nil(); }
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template<typename Arg1,typename Arg2,typename Arg3>
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nil operator()( Arg1 const&, Arg2 const&, Arg3 const& )
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{ nfp_detail::report_access_to_invalid_parameter(true); return nil(); }
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// Visitation support
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template<typename Visitor>
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void apply_to( Visitor& /*v*/ ) const {}
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static nil& inst() { static nil s_inst; return s_inst; }
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private:
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nil() {}
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};
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// ************************************************************************** //
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// ************** named_parameter_base ************** //
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// ************************************************************************** //
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namespace nfp_detail {
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template<typename Derived>
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struct named_parameter_base {
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template<typename NP>
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named_parameter_combine<NP,Derived>
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operator,( NP const& np ) const { return named_parameter_combine<NP,Derived>( np, *static_cast<Derived const*>(this) ); }
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};
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} // namespace nfp_detail
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// ************************************************************************** //
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// ************** named_parameter_combine ************** //
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// ************************************************************************** //
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template<typename NP, typename Rest = nil>
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struct named_parameter_combine
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: Rest
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, nfp_detail::named_parameter_base<named_parameter_combine<NP,Rest> > {
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typedef typename NP::ref_type res_type;
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typedef named_parameter_combine<NP,Rest> self_type;
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// Constructor
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named_parameter_combine( NP const& np, Rest const& r )
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: Rest( r )
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, m_param( np )
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{
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}
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// Access methods
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res_type operator[]( keyword<typename NP::id,true> kw ) const { return m_param[kw]; }
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res_type operator[]( keyword<typename NP::id,false> kw ) const { return m_param[kw]; }
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using Rest::operator[];
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bool has( keyword<typename NP::id,false> kw ) const { return m_param.has( kw ); }
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using Rest::has;
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void erase( keyword<typename NP::id,false> kw ) const { m_param.erase( kw ); }
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using Rest::erase;
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using nfp_detail::named_parameter_base<named_parameter_combine<NP,Rest> >::operator,;
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// Visitation support
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template<typename Visitor>
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void apply_to( Visitor& V ) const
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{
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m_param.apply_to( V );
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Rest::apply_to( V );
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}
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private:
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// Data members
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NP m_param;
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};
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// ************************************************************************** //
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// ************** named_parameter ************** //
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// ************************************************************************** //
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template<typename T, typename unique_id, typename RefType>
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struct named_parameter
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: nfp_detail::named_parameter_base<named_parameter<T,unique_id,RefType> >
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{
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typedef T data_type;
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typedef RefType ref_type;
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typedef unique_id id;
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// Constructor
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explicit named_parameter( ref_type v )
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: m_value( v )
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, m_erased( false )
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{}
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named_parameter( named_parameter const& np )
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: m_value( np.m_value )
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, m_erased( np.m_erased )
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{}
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// Access methods
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ref_type operator[]( keyword<unique_id,true> ) const { return m_erased ? nil::inst().template any_cast<ref_type>() : m_value; }
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ref_type operator[]( keyword<unique_id,false> ) const { return m_erased ? nil::inst().template any_cast<ref_type>() : m_value; }
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template<typename UnknownId>
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nil operator[]( keyword<UnknownId,false> ) const { return nil::inst(); }
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bool has( keyword<unique_id,false> ) const { return !m_erased; }
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template<typename UnknownId>
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bool has( keyword<UnknownId,false> ) const { return false; }
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void erase( keyword<unique_id,false> ) const { m_erased = true; }
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template<typename UnknownId>
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void erase( keyword<UnknownId,false> ) const {}
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// Visitation support
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template<typename Visitor>
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void apply_to( Visitor& V ) const
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{
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V.set_parameter( rtti::type_id<unique_id>(), m_value );
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}
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private:
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// Data members
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ref_type m_value;
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mutable bool m_erased;
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};
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// ************************************************************************** //
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// ************** no_params ************** //
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// ************************************************************************** //
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typedef named_parameter<char, struct no_params_type_t,char> no_params_type;
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namespace {
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no_params_type no_params( '\0' );
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} // local namespace
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// ************************************************************************** //
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// ************** keyword ************** //
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// ************************************************************************** //
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template<typename unique_id, bool required = false>
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struct keyword {
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typedef unique_id id;
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template<typename T>
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named_parameter<T const,unique_id>
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operator=( T const& t ) const { return named_parameter<T const,unique_id>( t ); }
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template<typename T>
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named_parameter<T,unique_id>
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operator=( T& t ) const { return named_parameter<T,unique_id>( t ); }
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named_parameter<char const*,unique_id,char const*>
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operator=( char const* t ) const { return named_parameter<char const*,unique_id,char const*>( t ); }
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};
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//____________________________________________________________________________//
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// ************************************************************************** //
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// ************** typed_keyword ************** //
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// ************************************************************************** //
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template<typename T, typename unique_id, bool required>
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struct typed_keyword : keyword<unique_id,required> {
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named_parameter<T const,unique_id>
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operator=( T const& t ) const { return named_parameter<T const,unique_id>( t ); }
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named_parameter<T,unique_id>
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operator=( T& t ) const { return named_parameter<T,unique_id>( t ); }
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};
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//____________________________________________________________________________//
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template<typename unique_id, bool required>
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struct typed_keyword<bool,unique_id,required>
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: keyword<unique_id,required>
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, named_parameter<bool,unique_id,bool> {
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typedef unique_id id;
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typed_keyword() : named_parameter<bool,unique_id,bool>( true ) {}
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named_parameter<bool,unique_id,bool>
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operator!() const { return named_parameter<bool,unique_id,bool>( false ); }
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};
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// ************************************************************************** //
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// ************** opt_assign ************** //
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// ************************************************************************** //
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template<typename T, typename Params, typename Keyword>
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inline typename enable_if_c<!has_param<Params,Keyword>::value,void>::type
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opt_assign( T& /*target*/, Params const& /*p*/, Keyword /*k*/ )
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{
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}
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//____________________________________________________________________________//
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template<typename T, typename Params, typename Keyword>
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inline typename enable_if_c<has_param<Params,Keyword>::value,void>::type
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opt_assign( T& target, Params const& p, Keyword k )
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{
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using namespace unit_test;
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assign_op( target, p[k], static_cast<int>(0) );
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}
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// ************************************************************************** //
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// ************** opt_get ************** //
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// ************************************************************************** //
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template<typename T, typename Params, typename Keyword>
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inline T
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opt_get( Params const& p, Keyword k, T default_val )
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{
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opt_assign( default_val, p, k );
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return default_val;
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}
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// ************************************************************************** //
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// ************** opt_get ************** //
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// ************************************************************************** //
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template<typename Params, typename NP>
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inline typename enable_if_c<!has_param<Params,keyword<typename NP::id> >::value,
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named_parameter_combine<NP,Params> >::type
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opt_append( Params const& params, NP const& np )
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{
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return (params,np);
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}
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//____________________________________________________________________________//
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template<typename Params, typename NP>
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inline typename enable_if_c<has_param<Params,keyword<typename NP::id> >::value,Params>::type
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opt_append( Params const& params, NP const& )
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{
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return params;
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}
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} // namespace nfp
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} // namespace boost
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_UTILS_NAMED_PARAM
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