source: src/ResolvExpr/typeops.h

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// typeops.h --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 07:28:22 2015
// Last Modified By : Andrew Beach
// Last Modified On : Wed Jan 18 11:54:00 2023
// Update Count     : 7
//

#pragma once

#include <vector>

#include "AST/Type.hpp"

namespace ResolvExpr {
        class TypeEnvironment;

        // combos: takes a list of sets and returns a set of lists representing every possible way of forming a list by
        // picking one element out of each set
        template< typename InputIterator, typename OutputIterator >
        void combos( InputIterator begin, InputIterator end, OutputIterator out ) {
                typedef typename InputIterator::value_type SetType;
                typedef typename std::vector< typename SetType::value_type > ListType;

                if ( begin == end )     {
                        *out++ = ListType();
                        return;
                } // if

                InputIterator current = begin;
                begin++;

                std::vector< ListType > recursiveResult;
                combos( begin, end, back_inserter( recursiveResult ) );

                for ( const auto& i : recursiveResult ) for ( const auto& j : *current ) {
                        ListType result;
                        std::back_insert_iterator< ListType > inserter = back_inserter( result );
                        *inserter++ = j;
                        std::copy( i.begin(), i.end(), inserter );
                        *out++ = result;
                }
        }

        /// flatten tuple type into existing list of types
        inline void flatten(
                const ast::Type * type, std::vector< ast::ptr< ast::Type > > & out
        ) {
                if ( auto tupleType = dynamic_cast< const ast::TupleType * >( type ) ) {
                        for ( const ast::Type * t : tupleType->types ) {
                                flatten( t, out );
                        }
                } else {
                        out.emplace_back( type );
                }
        }

        /// flatten tuple type into list of types
        inline std::vector< ast::ptr< ast::Type > > flatten( const ast::Type * type ) {
                std::vector< ast::ptr< ast::Type > > out;
                out.reserve( type->size() );
                flatten( type, out );
                return out;
        }

        template< typename Iter >
        const ast::Type * tupleFromTypes( Iter crnt, Iter end ) {
                std::vector< ast::ptr< ast::Type > > types;
                while ( crnt != end ) {
                        // it is guaranteed that a ttype variable will be bound to a flat tuple, so ensure
                        // that this results in a flat tuple
                        flatten( *crnt, types );

                        ++crnt;
                }

                return new ast::TupleType{ std::move(types) };
        }

        inline const ast::Type * tupleFromTypes(
                const std::vector< ast::ptr< ast::Type > > & tys
        ) {
                return tupleFromTypes( tys.begin(), tys.end() );
        }
} // namespace ResolvExpr

namespace ast {
        // in TypeEnvironment.cpp
        bool isFtype( const ast::Type * type );
} // namespace ast

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //