text: /*
   * MIT License
   *
   * Copyright (c) 2019 Francesco Lavra <francescolavra.fl@gmail.com>
   * and Contributors
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  #ifndef _POW_CLIENT_H_
  #define _POW_CLIENT_H_
  
  #include <Arduino.h>
  
  class PoWClient {
  public:
  
  	/** Perform Proof of Work on a transaction bundle
        @param trunk  Hash of trunk transaction to be approved when attaching
               transactions to the tangle
        @param branch  Hash of branch transaction to be approved when attaching
               transactions to the tangle
        @param mwm  Minimum weight magnitude to be used when doing Proof of Work
        @param txs  List of transactions consituting the bundle on which Proof of
               Work should be performed; these transactions are modified inside
               this method by adding Proof of Work data
        @return true if Proof of Work has been done successfully, false otherwise
  	*/
  	virtual bool pow(String trunk, String branch, int mwm,
  			std::vector<String> txs) = 0;
  };
  
  #endif
  