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

11 files changed, 35 insertions, 31 deletions

diff --git a/host/include/uhd/convert.hpp b/host/include/uhd/convert.hpp
index 4d84fcdaa..b94c46851 100644
--- a/host/include/uhd/convert.hpp
+++ b/host/include/uhd/convert.hpp
@@ -10,7 +10,7 @@
 
 #include <uhd/config.hpp>
 #include <uhd/types/ref_vector.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <boost/operators.hpp>
 #include <memory>
 #include <string>
@@ -51,7 +51,7 @@ private:
 };
 
 //! Conversion factory function typedef
-typedef boost::function<converter::sptr(void)> function_type;
+typedef std::function<converter::sptr(void)> function_type;
 
 //! Priority of conversion routines
 typedef int priority_type;
diff --git a/host/include/uhd/device.hpp b/host/include/uhd/device.hpp
index 11bedf216..f4594504d 100644
--- a/host/include/uhd/device.hpp
+++ b/host/include/uhd/device.hpp
@@ -13,7 +13,7 @@
 #include <uhd/stream.hpp>
 #include <uhd/types/device_addr.hpp>
 #include <uhd/utils/noncopyable.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <memory>
 
 namespace uhd {
@@ -28,8 +28,8 @@ class UHD_API device : uhd::noncopyable
 {
 public:
     typedef std::shared_ptr<device> sptr;
-    typedef boost::function<device_addrs_t(const device_addr_t&)> find_t;
-    typedef boost::function<sptr(const device_addr_t&)> make_t;
+    typedef std::function<device_addrs_t(const device_addr_t&)> find_t;
+    typedef std::function<sptr(const device_addr_t&)> make_t;
 
     //! Device type, used as a filter in make
     enum device_filter_t { ANY, USRP, CLOCK };
diff --git a/host/include/uhd/image_loader.hpp b/host/include/uhd/image_loader.hpp
index ba1ab7454..d3f9f5445 100644
--- a/host/include/uhd/image_loader.hpp
+++ b/host/include/uhd/image_loader.hpp
@@ -12,7 +12,7 @@
 #include <uhd/config.hpp>
 #include <uhd/types/device_addr.hpp>
 #include <uhd/utils/noncopyable.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <string>
 
 namespace uhd {
@@ -50,7 +50,7 @@ public:
      *    device and expect the default image(s) to be loaded, but the specific
      *    model of the device cannot be determined beyond a category.
      */
-    typedef boost::function<bool(const image_loader_args_t&)> loader_fcn_t;
+    typedef std::function<bool(const image_loader_args_t&)> loader_fcn_t;
 
     //! Register an image loader
     /*!
diff --git a/host/include/uhd/property_tree.hpp b/host/include/uhd/property_tree.hpp
index 4a839f8e9..9e4bcd57a 100644
--- a/host/include/uhd/property_tree.hpp
+++ b/host/include/uhd/property_tree.hpp
@@ -11,7 +11,7 @@
 
 #include <uhd/config.hpp>
 #include <uhd/utils/noncopyable.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <memory>
 #include <typeindex>
 #include <vector>
@@ -70,9 +70,9 @@ template <typename T>
 class property : uhd::noncopyable
 {
 public:
-    typedef boost::function<void(const T&)> subscriber_type;
-    typedef boost::function<T(void)> publisher_type;
-    typedef boost::function<T(const T&)> coercer_type;
+    typedef std::function<void(const T&)> subscriber_type;
+    typedef std::function<T(void)> publisher_type;
+    typedef std::function<T(const T&)> coercer_type;
 
     virtual ~property<T>(void) = 0;
 
diff --git a/host/include/uhd/property_tree.ipp b/host/include/uhd/property_tree.ipp
index 73b3c737a..7a4ffd85a 100644
--- a/host/include/uhd/property_tree.ipp
+++ b/host/include/uhd/property_tree.ipp
@@ -37,8 +37,9 @@ public:
 
     property<T>& set_coercer(const typename property<T>::coercer_type& coercer)
     {
-        if (not _coercer.empty())
+        if (_coercer) {
             uhd::assertion_error("cannot register more than one coercer for a property");
+        }
         if (_coerce_mode == property_tree::MANUAL_COERCE)
             uhd::assertion_error(
                 "cannot register coercer for a manually coerced property");
@@ -49,9 +50,10 @@ public:
 
     property<T>& set_publisher(const typename property<T>::publisher_type& publisher)
     {
-        if (not _publisher.empty())
+        if (_publisher) {
             uhd::assertion_error(
                 "cannot register more than one publisher for a property");
+        }
 
         _publisher = publisher;
         return *this;
@@ -91,7 +93,7 @@ public:
         for (typename property<T>::subscriber_type& dsub : _desired_subscribers) {
             dsub(get_value_ref(_value)); // let errors propagate
         }
-        if (not _coercer.empty()) {
+        if (_coercer) {
             _set_coerced(_coercer(get_value_ref(_value)));
         } else {
             if (_coerce_mode == property_tree::AUTO_COERCE)
@@ -113,7 +115,7 @@ public:
         if (empty()) {
             throw uhd::runtime_error("Cannot get() on an uninitialized (empty) property");
         }
-        if (not _publisher.empty()) {
+        if (_publisher) {
             return _publisher();
         } else {
             if (_coerced_value.get() == NULL
@@ -135,7 +137,7 @@ public:
 
     bool empty(void) const
     {
-        return _publisher.empty() and _value.get() == NULL;
+        return !bool(_publisher) and _value.get() == NULL;
     }
 
 private:
diff --git a/host/include/uhd/transport/bounded_buffer.ipp b/host/include/uhd/transport/bounded_buffer.ipp
index 4db182508..d1058756d 100644
--- a/host/include/uhd/transport/bounded_buffer.ipp
+++ b/host/include/uhd/transport/bounded_buffer.ipp
@@ -12,7 +12,7 @@
 #include <uhd/utils/noncopyable.hpp>
 #include <boost/bind.hpp>
 #include <boost/utility.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <boost/circular_buffer.hpp>
 #include <boost/thread/condition.hpp>
 #include <boost/thread/locks.hpp>
@@ -133,7 +133,7 @@ namespace uhd{ namespace transport{
         bool not_full(void) const{return not _buffer.full();}
         bool not_empty(void) const{return not _buffer.empty();}
 
-        boost::function<bool(void)> _not_full_fcn, _not_empty_fcn;
+        std::function<bool(void)> _not_full_fcn, _not_empty_fcn;
 
         /*!
          * Three part operation to pop an element:
diff --git a/host/include/uhd/transport/muxed_zero_copy_if.hpp b/host/include/uhd/transport/muxed_zero_copy_if.hpp
index 61086fbba..b2527db10 100644
--- a/host/include/uhd/transport/muxed_zero_copy_if.hpp
+++ b/host/include/uhd/transport/muxed_zero_copy_if.hpp
@@ -11,7 +11,7 @@
 #include <uhd/config.hpp>
 #include <uhd/transport/zero_copy.hpp>
 #include <stdint.h>
-#include <boost/function.hpp>
+#include <functional>
 #include <uhd/utils/noncopyable.hpp>
 
 namespace uhd { namespace transport {
@@ -40,7 +40,7 @@ public:
      * \param size number of bytes in the frame payload
      * \return stream number
      */
-    typedef boost::function<uint32_t(void* buff, size_t size)> stream_classifier_fn;
+    typedef std::function<uint32_t(void* buff, size_t size)> stream_classifier_fn;
 
     //! virtual dtor
     virtual ~muxed_zero_copy_if() {}
diff --git a/host/include/uhd/transport/zero_copy_flow_ctrl.hpp b/host/include/uhd/transport/zero_copy_flow_ctrl.hpp
index f12aed2a9..4028e2e1d 100644
--- a/host/include/uhd/transport/zero_copy_flow_ctrl.hpp
+++ b/host/include/uhd/transport/zero_copy_flow_ctrl.hpp
@@ -10,7 +10,7 @@
 
 #include <uhd/config.hpp>
 #include <uhd/transport/zero_copy.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <memory>
 
 namespace uhd { namespace transport {
@@ -20,7 +20,7 @@ namespace uhd { namespace transport {
  * \param buff buffer to be sent or receive buffer being released
  * \return true if OK, false if not
  */
-typedef boost::function<bool(managed_buffer::sptr buff)> flow_ctrl_func;
+typedef std::function<bool(managed_buffer::sptr buff)> flow_ctrl_func;
 
 /*!
  * Adds flow control to any zero_copy_if transport.
diff --git a/host/include/uhd/utils/gain_group.hpp b/host/include/uhd/utils/gain_group.hpp
index 8fe69441f..bfc6a94a6 100644
--- a/host/include/uhd/utils/gain_group.hpp
+++ b/host/include/uhd/utils/gain_group.hpp
@@ -11,7 +11,7 @@
 #include <uhd/config.hpp>
 #include <uhd/types/ranges.hpp>
 #include <uhd/utils/noncopyable.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <memory>
 #include <string>
 #include <vector>
@@ -23,9 +23,9 @@ namespace uhd {
  */
 struct UHD_API gain_fcns_t
 {
-    boost::function<gain_range_t(void)> get_range;
-    boost::function<double(void)> get_value;
-    boost::function<void(double)> set_value;
+    std::function<gain_range_t(void)> get_range;
+    std::function<double(void)> get_value;
+    std::function<void(double)> set_value;
 };
 
 class UHD_API gain_group : uhd::noncopyable
diff --git a/host/include/uhd/utils/msg_task.hpp b/host/include/uhd/utils/msg_task.hpp
index fd08523f7..9b8b5b23d 100644
--- a/host/include/uhd/utils/msg_task.hpp
+++ b/host/include/uhd/utils/msg_task.hpp
@@ -1,6 +1,7 @@
 //
 // Copyright 2011-2015 Ettus Research LLC
 // Copyright 2018 Ettus Research, a National Instruments Company
+// Copyright 2019 Ettus Research, a National Instruments Brand
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 //
@@ -10,11 +11,12 @@
 
 #include <uhd/config.hpp>
 #include <uhd/transport/zero_copy.hpp>
+#include <uhd/utils/noncopyable.hpp>
 #include <stdint.h>
-#include <boost/function.hpp>
 #include <boost/optional/optional.hpp>
+#include <cstring>
+#include <functional>
 #include <memory>
-#include <uhd/utils/noncopyable.hpp>
 #include <vector>
 
 namespace uhd {
@@ -24,7 +26,7 @@ public:
     typedef std::shared_ptr<msg_task> sptr;
     typedef std::vector<uint8_t> msg_payload_t;
     typedef std::pair<uint32_t, msg_payload_t> msg_type_t;
-    typedef boost::function<boost::optional<msg_type_t>(void)> task_fcn_type;
+    typedef std::function<boost::optional<msg_type_t>(void)> task_fcn_type;
 
     /*
      * During shutdown message queues for radio control cores might not be available
diff --git a/host/include/uhd/utils/tasks.hpp b/host/include/uhd/utils/tasks.hpp
index eaee3edbe..456af25e6 100644
--- a/host/include/uhd/utils/tasks.hpp
+++ b/host/include/uhd/utils/tasks.hpp
@@ -12,7 +12,7 @@
 
 #include <uhd/config.hpp>
 #include <uhd/utils/noncopyable.hpp>
-#include <boost/function.hpp>
+#include <functional>
 #include <memory>
 #include <string>
 
@@ -22,7 +22,7 @@ class UHD_API task : uhd::noncopyable
 {
 public:
     typedef std::shared_ptr<task> sptr;
-    typedef boost::function<void(void)> task_fcn_type;
+    typedef std::function<void(void)> task_fcn_type;
 
     /*!
      * Create a new task object with function callback.