From fa0313652cc25e17e6c3151f67111fb88c62778e Mon Sep 17 00:00:00 2001
From: michael-west <michael.west@ettus.com>
Date: Fri, 19 Sep 2014 18:22:13 -0700
Subject: uhd: Fixed logging bug (#476) -- UHD logging has unexplained effect
 on packet loss. - Removed logging from radio_ctrl_core_3000 - Changed logging
 facility to prevent type conversion when message is not logged

---
 host/include/uhd/utils/log.hpp | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

(limited to 'host/include')

diff --git a/host/include/uhd/utils/log.hpp b/host/include/uhd/utils/log.hpp
index 1f515c15e..5baa00108 100644
--- a/host/include/uhd/utils/log.hpp
+++ b/host/include/uhd/utils/log.hpp
@@ -21,8 +21,10 @@
 #include <uhd/config.hpp>
 #include <uhd/utils/pimpl.hpp>
 #include <boost/current_function.hpp>
+#include <boost/format.hpp>
 #include <ostream>
 #include <string>
+#include <sstream>
 
 /*! \file log.hpp
  * The UHD logging facility.
@@ -55,7 +57,7 @@
  * Usage: UHD_LOGV(very_rarely) << "the log message" << std::endl;
  */
 #define UHD_LOGV(verbosity) \
-    uhd::_log::log(uhd::_log::verbosity, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION)()
+    uhd::_log::log(uhd::_log::verbosity, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION)
 
 /*!
  * A UHD logger macro with default verbosity.
@@ -78,7 +80,7 @@ namespace uhd{ namespace _log{
     };
 
     //! Internal logging object (called by UHD_LOG macros)
-    class UHD_API log{
+    class UHD_API log {
     public:
         log(
             const verbosity_t verbosity,
@@ -86,10 +88,29 @@ namespace uhd{ namespace _log{
             const unsigned int line,
             const std::string &function
         );
+
         ~log(void);
-        std::ostream &operator()(void);
+
+        // Macro for overloading insertion operators to avoid costly
+        // conversion of types if not logging.
+        #define INSERTION_OVERLOAD(x)   log& operator<< (x)             \
+                                        {                               \
+                                            if(_log_it) _ss << val;     \
+                                            return *this;               \
+                                        }
+
+        // General insertion overload
+        template <typename T>
+        INSERTION_OVERLOAD(T val);
+
+        // Insertion overloads for std::ostream manipulators
+        INSERTION_OVERLOAD(std::ostream& (*val)(std::ostream&));
+        INSERTION_OVERLOAD(std::ios& (*val)(std::ios&));
+        INSERTION_OVERLOAD(std::ios_base& (*val)(std::ios_base&));
+
     private:
-        UHD_PIMPL_DECL(impl) _impl;
+        std::ostringstream _ss;
+        bool _log_it;
     };
 
 }} //namespace uhd::_log
-- 
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