110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2013 Tom Bachmann
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******************************************************************************/
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// This file contains helpers recognising expression templates
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#ifndef CXX_EXPRESSION_TRAITS_H
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#define CXX_EXPRESSION_TRAITS_H
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#include "mp.h"
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#include "traits.h"
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namespace flint {
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namespace operations {
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// These are the operation tags the expression class creates directly.
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// unary operations
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struct immediate { };
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struct negate { };
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struct complement { };
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// binary operations
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struct plus { };
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struct minus { };
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struct times { };
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struct divided_by { };
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struct modulo { };
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struct shift { }; // left
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struct binary_and { };
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struct binary_or { };
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struct binary_xor { };
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} // operations
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namespace traits {
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template<class T, class Enable = void>
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struct is_expression : mp::false_ { };
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template<class T>
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struct is_expression<T, typename T::IS_EXPRESSION_MARKER> : mp::true_ { };
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template<class T>
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struct _is_immediate_expr
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: _is_convertible<
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typename basetype<T>::type::operation_t,
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operations::immediate
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>
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{ };
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// Compute if T is an expression, with operation "immediate"
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template<class T, class Enable = void>
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struct is_immediate_expr : _is_immediate_expr<T> { };
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template<class T>
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struct is_immediate_expr<T,
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typename mp::enable_if<mp::not_<is_expression<T> > >::type>
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: mp::false_ { };
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// Compute if T is an immediate expression, *or not an expression at all*
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template<class T>
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struct is_immediate
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: mp::or_<mp::not_<is_expression<T> >, is_immediate_expr<T> > { };
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// Compute if T is a non-immediate expression
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template<class T>
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struct is_lazy_expr
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: mp::and_<is_expression<T>, mp::not_<is_immediate_expr<T> > > { };
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// Compute if Expr is an expression with prescribed evaluated type "T"
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template<class Expr, class T, class Enable = void>
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struct is_T_expr
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: mp::equal_types<typename Expr::evaluated_t, T> { };
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template<class Expr, class T>
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struct is_T_expr<Expr, T,
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typename mp::disable_if<traits::is_expression<Expr> >::type>
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: false_ { };
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// Decide if an expressing yielding From can be directly evaluated into To.
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// To be further specialised!
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template<class To, class From, class Enable = void>
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struct can_evaluate_into : mp::false_ { };
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template<class T>
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struct can_evaluate_into<T, T> : mp::true_ { };
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// Decide if we should use temporary merging
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template<class Expr>
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struct use_temporary_merging : mp::true_ { };
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} // traits
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} // flint
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#endif
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