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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <drizzled/function/math/neg.h>
namespace drizzled
{
double Item_func_neg::real_op()
{
double value= args[0]->val_real();
null_value= args[0]->null_value;
return -value;
}
int64_t Item_func_neg::int_op()
{
int64_t value= args[0]->val_int();
null_value= args[0]->null_value;
return -value;
}
type::Decimal *Item_func_neg::decimal_op(type::Decimal *decimal_value)
{
type::Decimal val, *value= args[0]->val_decimal(&val);
if (!(null_value= args[0]->null_value))
{
class_decimal2decimal(value, decimal_value);
class_decimal_neg(decimal_value);
return decimal_value;
}
return 0;
}
void Item_func_neg::fix_num_length_and_dec()
{
decimals= args[0]->decimals;
/* 1 add because sign can appear */
max_length= args[0]->max_length + 1;
}
void Item_func_neg::fix_length_and_dec()
{
Item_func_num1::fix_length_and_dec();
/*
If this is in integer context keep the context as integer if possible
(This is how multiplication and other integer functions works)
Use val() to get value as arg_type doesn't mean that item is
Item_int or Item_real due to existence of Item_param.
*/
if (hybrid_type == INT_RESULT && args[0]->const_item())
{
int64_t val= args[0]->val_int();
if ((uint64_t) val >= (uint64_t) INT64_MIN &&
((uint64_t) val != (uint64_t) INT64_MIN ||
args[0]->type() != INT_ITEM))
{
/*
Ensure that result is converted to DECIMAL, as int64_t can't hold
the negated number
*/
hybrid_type= DECIMAL_RESULT;
}
}
unsigned_flag= false;
}
} /* namespace drizzled */
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