return nullptr;
auto prop = properties_->find(key);
return prop == properties_->end() ? nullptr : prop->second.c_str();
}
/** @brief Change the value of a given key in the property set */
return nullptr;
auto prop = properties_->find(key);
return prop == properties_->end() ? nullptr : prop->second.c_str();
}
/** @brief Change the value of a given key in the property set */