/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "pg_config.h"

IDENT("@(#) cnv_func_tab.cc (Gunther Schadow) 12/19/96");

#include "UnitAtom.h"
#include <math.h>

static double to_cel(double T_cel)     { return T_cel  - 273.15; }
static double from_cel(double T_cel)   { return T_cel  + 273.15; }
static double to_degf(double T_degf)   { return T_degf - 459.67; }
static double from_degf(double T_degf) { return T_degf + 459.67; }
static double to_ph(double cH_molpl)   { return -log10(cH_molpl); }
static double from_ph(double cH_pH)    { return  pow(10, -cH_pH); }

static double to_ln(double x)      { return  log(x); }
static double from_ln(double x)    { return  exp(x); }
static double to_lg(double x)      { return  log10(x); }
static double from_lg(double x)    { return  pow(10, x); }
static double to_10_lg(double x)   { return  10 * log10(x); }
static double from_10_lg(double x) { return  pow(10, x/10); }
static double to_20_lg(double x)   { return  20 * log10(x); }
static double from_20_lg(double x) { return  pow(10, x/20); }

UnitAtom::cnv_func
UnitAtom::cnv_func::tab[] = {
  {"cel_f",  from_cel,  to_cel},
  {"degf_f", from_degf, to_degf},
  {"ph_f",   from_ph,   to_ph},
  {"f_ln",   from_ln,   to_ln},
  {"f_lg",   from_lg,   to_lg},
  {"f_10_lg",from_10_lg,to_10_lg},
  {"f_20_lg",from_20_lg,to_20_lg},
  {NULL,     NULL,      NULL},
};