3 files changed, 29 insertions, 28 deletions

diff --git a/gnuradio-core/src/lib/general/gr_prefs.cc b/gnuradio-core/src/lib/general/gr_prefs.cc
index 953143bc5..7e48e3486 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.cc
+++ b/gnuradio-core/src/lib/general/gr_prefs.cc
@@ -119,14 +119,14 @@ gr_prefs::_read_files()
 }
 
 bool
-gr_prefs::has_section(const std::string section)
+gr_prefs::has_section(const std::string &section)
 {
   size_t t = d_configs.find("[" + section + "]#");
   return t != std::string::npos;
 }
 
 bool
-gr_prefs::has_option(const std::string section, const std::string option)
+gr_prefs::has_option(const std::string &section, const std::string &option)
 {
   if(has_section(section)) {
     size_t sec = d_configs.find("[" + section + "]#");
@@ -139,7 +139,8 @@ gr_prefs::has_option(const std::string section, const std::string option)
 }
 
 const std::string
-gr_prefs::get_string(const std::string section, const std::string option, const std::string default_val)
+gr_prefs::get_string(const std::string &section, const std::string &option,
+		     const std::string &default_val)
 {
   std::stringstream envname;
   std::string secname=section, optname=option;
@@ -170,7 +171,7 @@ gr_prefs::get_string(const std::string section, const std::string option, const
 }
 
 bool
-gr_prefs::get_bool(const std::string section, const std::string option, bool default_val)
+gr_prefs::get_bool(const std::string &section, const std::string &option, bool default_val)
 {
   if(has_option(section, option)) {
     std::string str = get_string(section, option, "");
@@ -191,7 +192,7 @@ gr_prefs::get_bool(const std::string section, const std::string option, bool def
 }
 
 long
-gr_prefs::get_long(const std::string section, const std::string option, long default_val)
+gr_prefs::get_long(const std::string &section, const std::string &option, long default_val)
 {
   if(has_option(section, option)) {
     std::string str = get_string(section, option, "");
@@ -209,7 +210,7 @@ gr_prefs::get_long(const std::string section, const std::string option, long def
 }
 
 double
-gr_prefs::get_double(const std::string section, const std::string option, double default_val)
+gr_prefs::get_double(const std::string &section, const std::string &option, double default_val)
 {
   if(has_option(section, option)) {
     std::string str = get_string(section, option, "");
diff --git a/gnuradio-core/src/lib/general/gr_prefs.h b/gnuradio-core/src/lib/general/gr_prefs.h
index 90d602741..dc2745d16 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.h
+++ b/gnuradio-core/src/lib/general/gr_prefs.h
@@ -46,39 +46,39 @@ public:
   /*!
    * \brief Does \p section exist?
    */
-  virtual bool has_section(const std::string section);
+  virtual bool has_section(const std::string &section);
 
   /*!
    * \brief Does \p option exist?
    */
-  virtual bool has_option(const std::string section, const std::string option);
+  virtual bool has_option(const std::string &section, const std::string &option);
 
   /*!
    * \brief If option exists return associated value; else default_val.
    */
-  virtual const std::string get_string(const std::string section,
-				       const std::string option,
-				       const std::string default_val);
+  virtual const std::string get_string(const std::string &section,
+				       const std::string &option,
+				       const std::string &default_val);
 
   /*!
    * \brief If option exists and value can be converted to bool, return it; else default_val.
    */
-  virtual bool get_bool(const std::string section,
-			const std::string option,
+  virtual bool get_bool(const std::string &section,
+			const std::string &option,
 			bool default_val);
 
   /*!
    * \brief If option exists and value can be converted to long, return it; else default_val.
    */
-  virtual long get_long(const std::string section,
-			const std::string option,
+  virtual long get_long(const std::string &section,
+			const std::string &option,
 			long default_val);
 
   /*!
    * \brief If option exists and value can be converted to double, return it; else default_val.
    */
-  virtual double get_double(const std::string section,
-			    const std::string option,
+  virtual double get_double(const std::string &section,
+			    const std::string &option,
 			    double default_val);
 
  protected:
diff --git a/gnuradio-core/src/lib/general/gr_prefs.i b/gnuradio-core/src/lib/general/gr_prefs.i
index cfb4cdb4e..b21d47f3b 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.i
+++ b/gnuradio-core/src/lib/general/gr_prefs.i
@@ -31,39 +31,39 @@ public:
   /*!
    * \brief Does \p section exist?
    */
-  virtual bool has_section(const std::string section);
+  virtual bool has_section(const std::string &section);
 
   /*!
    * \brief Does \p option exist?
    */
-  virtual bool has_option(const std::string section, const std::string option);
+  virtual bool has_option(const std::string &section, const std::string &option);
 
   /*!
    * \brief If option exists return associated value; else default_val.
    */
-  virtual const std::string get_string(const std::string section,
-				       const std::string option,
-				       const std::string default_val);
+  virtual const std::string get_string(const std::string &section,
+				       const std::string &option,
+				       const std::string &default_val);
 
   /*!
    * \brief If option exists and value can be converted to bool, return it; else default_val.
    */
-  virtual bool get_bool(const std::string section,
-			const std::string option,
+  virtual bool get_bool(const std::string &section,
+			const std::string &option,
 			bool default_val);
 
   /*!
    * \brief If option exists and value can be converted to long, return it; else default_val.
    */
-  virtual long get_long(const std::string section,
-			const std::string option,
+  virtual long get_long(const std::string &section,
+			const std::string &option,
 			long default_val);
 
   /*!
    * \brief If option exists and value can be converted to double, return it; else default_val.
    */
-  virtual double get_double(const std::string section,
-			    const std::string option,
+  virtual double get_double(const std::string &section,
+			    const std::string &option,
 			    double default_val);
 };