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log.cc
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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, Inc.
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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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#include <config.h>
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#include <math.h>
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#include "log.h"
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namespace
drizzled
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{
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double
Item_func_log::val_real
()
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{
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assert(
fixed
== 1);
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double
value= args[0]->
val_real
();
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if
((
null_value
= args[0]->
null_value
))
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return
0.0;
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if
(value <= 0.0)
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{
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signal_divide_by_null();
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return
0.0;
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}
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if
(arg_count == 2)
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{
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double
value2= args[1]->
val_real
();
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if
((
null_value
= args[1]->
null_value
))
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return
0.0;
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if
(value2 <= 0.0 || value == 1.0)
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{
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signal_divide_by_null();
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return
0.0;
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}
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return
log(value2) / log(value);
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}
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return
log(value);
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}
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double
Item_func_log2::val_real
()
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{
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assert(
fixed
== 1);
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double
value= args[0]->
val_real
();
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if
((
null_value
=args[0]->
null_value
))
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return
0.0;
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if
(value <= 0.0)
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{
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signal_divide_by_null();
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return
0.0;
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}
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return
log(value) / M_LN2;
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}
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double
Item_func_log10::val_real
()
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{
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assert(
fixed
== 1);
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double
value= args[0]->
val_real
();
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if
((
null_value
= args[0]->
null_value
))
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return
0.0;
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if
(value <= 0.0)
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{
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signal_divide_by_null();
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return
0.0;
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}
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return
log10(value);
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}
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}
/* namespace drizzled */
drizzled::Item_func_log10::val_real
double val_real()
Definition:
log.cc:74
drizzled::Item::fixed
bool fixed
Definition:
item.h:120
drizzled::Item::null_value
bool null_value
Definition:
item.h:122
drizzled::Item_func_log::val_real
double val_real()
Definition:
log.cc:33
drizzled::Item::val_real
virtual double val_real()=0
drizzled::Item_func_log2::val_real
double val_real()
Definition:
log.cc:59
plugin
math_functions
log.cc
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