// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#ifndef EVALUATE_H
#define EVALUATE_H

#include <eval/token.h>

namespace isc {
namespace dhcp {

/// @brief Evaluate a RPN expression for a v4 or v6 packet and return
///        a true or false decision
///
/// @param expr the RPN expression, i.e., a vector of parsed tokens
/// @param pkt  The v4 or v6 packet
/// @return the boolean decision
/// @throw EvalStackError if there is not exactly one element on the value
///        stack at the end of the evaluation
/// @throw EvalTypeError if the value at the top of the stack at the
///        end of the evaluation is not "false" or "true"
bool evaluate(const Expression& expr, const Pkt& pkt);

}; // end of isc::dhcp namespace
}; // end of isc namespace

#endif