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942.1.12
by Monty Taylor
Converted udf_func into a factory. |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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* Copyright (C) 2008 Sun Microsystems
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*
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* This program 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; version 2 of the License.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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#ifndef DRIZZLED_FUNCTION_CREATE_H
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#define DRIZZLED_FUNCTION_CREATE_H
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#include <drizzled/item.h> |
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#include <drizzled/sql_list.h> |
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#include <drizzled/item/bin_string.h> |
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#include <string> |
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#include <functional> |
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class Function_builder |
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: public std::unary_function<MEM_ROOT*, Item_func *> |
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{
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std::string name; |
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public: |
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Function_builder(std::string in_name) : name(in_name) {} |
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virtual result_type operator()(argument_type session) const= 0; |
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virtual ~Function_builder() {} |
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std::string get_name() const |
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{
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return name; |
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}
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};
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template<class T> |
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class Create_function : public Function_builder |
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{
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public: |
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typedef T Function_class; |
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Create_function(std::string in_name): Function_builder(in_name) {} |
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virtual result_type operator()(argument_type root) const |
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{
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return new (root) Function_class(); |
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}
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};
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#endif /* DRIZZLED_FUNCTION_CREATE_H */ |