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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Monty Taylor
*
* 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
*/
#ifndef DRIZZLED_CONSTRAINED_VALUE_H
#define DRIZZLED_CONSTRAINED_VALUE_H
#include <boost/program_options.hpp>
#include <boost/program_options/errors.hpp>
#include <iostream>
namespace drizzled
{
template<class T> class constrained_value;
template<class T>
std::istream& operator>>(std::istream& is, constrained_value<T>& bound_val);
template<class T>
std::ostream& operator<<(std::ostream& os, const constrained_value<T>& v);
template<class T>
class constrained_value
{
T m_val;
protected:
virtual constrained_value<T>& set_value(const constrained_value<T>& rhs)= 0;
virtual constrained_value<T>& set_value(T rhs)= 0;
public:
explicit constrained_value<T>(T in_value= 0) :
m_val(in_value)
{ }
virtual ~constrained_value<T>()
{}
operator T() const
{
return m_val;
}
constrained_value<T>& operator=(const constrained_value<T>& rhs)
{
return set_value(rhs);
}
constrained_value<T>& operator=(T rhs)
{
return set_value(rhs);
}
T getVal() const
{
return m_val;
}
void setVal(T in_val)
{
m_val= in_val;
}
friend std::istream&
operator>>(std::istream& is,
constrained_value<T>& bound_val)
{
T inner_val;
is >> inner_val;
bound_val= inner_val;
return is;
}
friend
std::ostream& operator<<(std::ostream& os, const constrained_value<T>& v)
{
os << v.getVal();
return os;
}
};
template<class T, uint64_t MAXVAL=UINT64_MAX, int64_t MINVAL=INT64_MIN, int ALIGN=1>
class constrained_check :
public constrained_value<T>
{
public:
constrained_check<T,MAXVAL,MINVAL,ALIGN>(T in_value= 0) :
constrained_value<T>(in_value)
{ }
protected:
constrained_value<T>& set_value(const constrained_value<T>& rhs)
{
return set_value(rhs.getVal());
}
constrained_value<T>& set_value(T rhs)
{
if ((rhs > MAXVAL) || (rhs < MINVAL))
{
boost::throw_exception(boost::program_options::invalid_option_value(boost::lexical_cast<std::string>(rhs)));
}
rhs-= rhs % ALIGN;
setVal(rhs);
return *this;
}
};
typedef constrained_check<uint32_t,65535,1> back_log_constraints;
} /* namespace drizzled */
template<class T>
void validate(boost::any& v,
const std::vector<std::string>& values,
drizzled::constrained_value<T> val, int)
{
boost::program_options::validators::check_first_occurrence(v);
const std::string& s= boost::program_options::validators::get_single_string(values);
val= boost::lexical_cast<T>(s);
v= boost::any(val);
}
#endif /* DRIZZLED_CONSTRAINED_VALUE_H */
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