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//
// Copyright (c) 2006-2007, Benjamin Kaufmann
//
// This file is part of aspcud.
//
// gringo 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 3 of the License, or
// (at your option) any later version.
//
// gringo 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 gringo. If not, see <http://www.gnu.org/licenses/>.
//
#ifndef PROGRAM_OPTIONS_VALUE_BASE_H_INCLUDED
#define PROGRAM_OPTIONS_VALUE_BASE_H_INCLUDED
#ifdef _MSC_VER
#pragma warning (disable : 4786)
#pragma warning (disable : 4503)
#endif
#include <string>
namespace ProgramOptions {
//! base class for values of options
class ValueBase
{
protected:
ValueBase();
public:
virtual ~ValueBase() = 0;
//! returns true if the object already stores a value
virtual bool hasValue() const = 0;
//! returns true if the value of the option is implicit
/*!
* this property is only meaningful for command line options.
* An implicit option is a flag, i.e an option that does not
* expect an explicit value.
* Example: --help or --version
*/
virtual bool isImplicit() const = 0;
//! returns true if the value of this option can be composed from multiple source
virtual bool isComposing() const = 0;
//! returns true if the value currently holds its default value
virtual bool isDefaulted() const = 0;
//! sets the value's default value as value.
/*!
* \return true if the default value was set
*/
virtual bool applyDefault() = 0;
//! Parses the given string and stores the result in this value.
/*!
* \return
* - true if the given string contains a valid value
* - false otherwise
*/
virtual bool parse(const std::string&) = 0;
};
}
#endif
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