From df057ce754bed879302845998c5b557bf8859313 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Sun, 26 Jun 2011 17:32:20 -0700
Subject: usrp: created cores for the rx and tx dsp

---
 host/include/uhd/property.hpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'host/include')

diff --git a/host/include/uhd/property.hpp b/host/include/uhd/property.hpp
index e3b917334..6f337cb52 100644
--- a/host/include/uhd/property.hpp
+++ b/host/include/uhd/property.hpp
@@ -32,6 +32,7 @@ namespace uhd{
 template <typename T> class UHD_API property{
 public:
     typedef boost::function<void(const T &)> subscriber_type;
+    typedef boost::function<T(void)> publisher_type;
     typedef boost::function<T(const T &)> master_type;
 
     /*!
@@ -44,6 +45,17 @@ public:
         _master = master;
     }
 
+    /*!
+     * Register a publisher into the property.
+     * A publisher is a special callback the provides the value.
+     * Publishers are useful for creating read-only properties.
+     * Only one publisher may be registered per property.
+     * Registering a publisher replaces the previous publisher.
+     */
+    void publish(const publisher_type &publisher){
+        _publisher = publisher;
+    }
+
     /*!
      * Register a subscriber into the property.
      * All subscribers are called when the value changes.
@@ -71,11 +83,12 @@ public:
 
     //! Get the current value of this property
     T get(void) const{
-        return _value;
+        return _publisher.empty()? _value : _publisher();
     }
 
 private:
     std::list<subscriber_type> _subscribers;
+    publisher_type _publisher;
     master_type _master;
     T _value;
 };
-- 
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