monero/src/common/json_util.h

// Copyright (c) 2016-2018, The Monero Project
// 
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// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
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//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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#pragma once 

#define GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, name, type, jtype, mandatory, def) \
  type field_##name = static_cast<type>(def); \
  bool field_##name##_found = false; \
  (void)field_##name##_found; \
  do if (json.HasMember(#name)) \
  { \
    if (json[#name].Is##jtype()) \
    { \
      field_##name = static_cast<type>(json[#name].Get##jtype()); \
      field_##name##_found = true; \
    } \
    else \
    { \
      LOG_ERROR("Field " << #name << " found in JSON, but not " << #jtype); \
      return false; \
    } \
  } \
  else if (mandatory) \
  { \
    LOG_ERROR("Field " << #name << " not found in JSON"); \
    return false; \
  } while(0)