/usr/include/uhd/property_tree.ipp is in libuhd-dev 3.5.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright 2011 Ettus Research LLC
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
#ifndef INCLUDED_UHD_PROPERTY_TREE_IPP
#define INCLUDED_UHD_PROPERTY_TREE_IPP
#include <uhd/exception.hpp>
#include <boost/foreach.hpp>
#include <vector>
/***********************************************************************
* Implement templated property impl
**********************************************************************/
namespace uhd{ namespace /*anon*/{
template <typename T> class property_impl : public property<T>{
public:
property<T> &coerce(const typename property<T>::coercer_type &coercer){
_coercer = coercer;
return *this;
}
property<T> &publish(const typename property<T>::publisher_type &publisher){
_publisher = publisher;
return *this;
}
property<T> &subscribe(const typename property<T>::subscriber_type &subscriber){
_subscribers.push_back(subscriber);
return *this;
}
property<T> &update(void){
this->set(this->get());
return *this;
}
property<T> &set(const T &value){
_value = boost::shared_ptr<T>(new T(_coercer.empty()? value : _coercer(value)));
BOOST_FOREACH(typename property<T>::subscriber_type &subscriber, _subscribers){
subscriber(*_value); //let errors propagate
}
return *this;
}
T get(void) const{
if (empty()) throw uhd::runtime_error("Cannot get() on an empty property");
return _publisher.empty()? *_value : _publisher();
}
bool empty(void) const{
return _publisher.empty() and _value.get() == NULL;
}
private:
std::vector<typename property<T>::subscriber_type> _subscribers;
typename property<T>::publisher_type _publisher;
typename property<T>::coercer_type _coercer;
boost::shared_ptr<T> _value;
};
}} //namespace uhd::/*anon*/
/***********************************************************************
* Implement templated methods for the property tree
**********************************************************************/
namespace uhd{
template <typename T> property<T> &property_tree::create(const fs_path &path){
this->_create(path, typename boost::shared_ptr<property<T> >(new property_impl<T>()));
return this->access<T>(path);
}
template <typename T> property<T> &property_tree::access(const fs_path &path){
return *boost::static_pointer_cast<property<T> >(this->_access(path));
}
} //namespace uhd
#endif /* INCLUDED_UHD_PROPERTY_TREE_IPP */
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