Respond to MMC even when synced to JACK. Fixes #3700.

[ardour.git] / libs / ardour / ardour / configuration_variable.h

diff --git a/libs/ardour/ardour/configuration_variable.h b/libs/ardour/ardour/configuration_variable.h
index ec954e8d9c4f0206a93b4e11371a60c73a2bdff5..fa53b6a1c4f16ed609df8bfdb75851232a0d69bf 100644 (file)
--- a/libs/ardour/ardour/configuration_variable.h
+++ b/libs/ardour/ardour/configuration_variable.h
@@ -154,6 +154,31 @@ class ConfigVariableWithMutation : public ConfigVariable<T>
        T (*mutator)(T);
 };
 
+template<>
+class ConfigVariableWithMutation<std::string> : public ConfigVariable<std::string>
+{
+  public:
+       ConfigVariableWithMutation (std::string name, std::string val, std::string (*m)(std::string))
+               : ConfigVariable<std::string> (name, val), mutator (m) {}
+
+       bool set (std::string val) {
+               if (unmutated_value != val) {
+                       unmutated_value = val;
+                       return ConfigVariable<std::string>::set (mutator (val));
+               }
+               return false;
+       }
+
+       void set_from_string (std::string const & s) {
+               set (s);
+       }
+
+  protected:
+       virtual std::string get_for_save() { return unmutated_value; }
+       std::string unmutated_value;
+       std::string (*mutator)(std::string);
+};
+
 }
 
 #endif /* __ardour_configuration_variable_h__ */