uhd: Replace boost::function with std::function

This is mostly a search-and-replace operation, with few exceptions:
- boost::function has a clear() method. In C++11, this is achieved by
  assigning nullptr to the std::function object.
- The empty() method is replaced by std::function's bool() operator

1 files changed, 1 insertions, 1 deletions

diff --git a/host/examples/rfnoc_rx_to_file.cpp b/host/examples/rfnoc_rx_to_file.cpp
index 7908b2ef6..2211831aa 100644
--- a/host/examples/rfnoc_rx_to_file.cpp
+++ b/host/examples/rfnoc_rx_to_file.cpp
@@ -176,7 +176,7 @@ void recv_to_file(uhd::rx_streamer::sptr rx_stream,
     }
 }
 
-typedef boost::function<uhd::sensor_value_t(const std::string&)> get_sensor_fn_t;
+typedef std::function<uhd::sensor_value_t(const std::string&)> get_sensor_fn_t;
 
 bool check_locked_sensor(std::vector<std::string> sensor_names,
     const char* sensor_name,