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584.4.2
by Monty Taylor
Split out hybrid_type_traits. |
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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_HYBRID_TYPE_H
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#define DRIZZLED_HYBRID_TYPE_H
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#include <stdint.h> |
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#include <drizzled/my_decimal.h> |
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/*************************************************************************/
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/*
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A framework to easily handle different return types for hybrid items
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(hybrid item is an item whose operand can be of any type, e.g. integer,
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real, decimal).
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*/
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class Hybrid_type_traits; |
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class Hybrid_type |
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{
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public: |
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int64_t integer; |
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double real; |
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/*
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Use two decimal buffers interchangeably to speed up += operation
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which has no native support in decimal library.
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Hybrid_type+= arg is implemented as dec_buf[1]= dec_buf[0] + arg.
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The third decimal is used as a handy temporary storage.
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*/
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my_decimal dec_buf[3]; |
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int used_dec_buf_no; |
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/*
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Traits moved to a separate class to
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a) be able to easily change object traits in runtime
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b) they work as a differentiator for the union above
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*/
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const Hybrid_type_traits *traits; |
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Hybrid_type() {} |
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/* XXX: add traits->copy() when needed */
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Hybrid_type(const Hybrid_type &rhs) :traits(rhs.traits) {} |
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};
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#endif /* DRIZZLED_HYBRID_TYPE_H */ |