Setting: Remove "Tag" template argument

src/libutil/config.cc

@@ -111,83 +111,72 @@ AbstractSetting::AbstractSetting(
 {
 }
 
-template<> void Setting<std::string>::set(const std::string & str)
+template<> void BaseSetting<std::string>::set(const std::string & str)
 {
     value = str;
 }
 
-template<> std::string Setting<std::string>::to_string()
+template<> std::string BaseSetting<std::string>::to_string()
 {
     return value;
 }
 
-template<typename T, typename Tag>
-void Setting<T, Tag>::set(const std::string & str)
+template<typename T>
+void BaseSetting<T>::set(const std::string & str)
 {
     static_assert(std::is_integral<T>::value, "Integer required.");
     if (!string2Int(str, value))
         throw UsageError("setting '%s' has invalid value '%s'", name, str);
 }
 
-template<typename T, typename Tag>
-std::string Setting<T, Tag>::to_string()
+template<typename T>
+std::string BaseSetting<T>::to_string()
 {
     static_assert(std::is_integral<T>::value, "Integer required.");
     return std::to_string(value);
 }
 
-bool AbstractSetting::parseBool(const std::string & str)
+template<> void BaseSetting<bool>::set(const std::string & str)
 {
     if (str == "true" || str == "yes" || str == "1")
-        return true;
+        value = true;
     else if (str == "false" || str == "no" || str == "0")
-        return false;
+        value = false;
     else
         throw UsageError("Boolean setting '%s' has invalid value '%s'", name, str);
 }
 
-template<> void Setting<bool>::set(const std::string & str)
+template<> std::string BaseSetting<bool>::to_string()
 {
-    value = parseBool(str);
+    return value ? "true" : "false";
 }
 
-std::string AbstractSetting::printBool(bool b)
-{
-    return b ? "true" : "false";
-}
-
-
-template<> std::string Setting<bool>::to_string()
-{
-    return printBool(value);
-}
-
-template<> void Setting<Strings>::set(const std::string & str)
+template<> void BaseSetting<Strings>::set(const std::string & str)
 {
     value = tokenizeString<Strings>(str);
 }
 
-template<> std::string Setting<Strings>::to_string()
+template<> std::string BaseSetting<Strings>::to_string()
 {
     return concatStringsSep(" ", value);
 }
 
-template<> void Setting<StringSet>::set(const std::string & str)
+template<> void BaseSetting<StringSet>::set(const std::string & str)
 {
     value = tokenizeString<StringSet>(str);
 }
 
-template<> std::string Setting<StringSet>::to_string()
+template<> std::string BaseSetting<StringSet>::to_string()
 {
     return concatStringsSep(" ", value);
 }
 
-template class Setting<int>;
-template class Setting<unsigned int>;
-template class Setting<long>;
-template class Setting<unsigned long>;
-template class Setting<long long>;
-template class Setting<unsigned long long>;
+template class BaseSetting<int>;
+template class BaseSetting<unsigned int>;
+template class BaseSetting<long>;
+template class BaseSetting<unsigned long>;
+template class BaseSetting<long long>;
+template class BaseSetting<unsigned long long>;
 
 void PathSetting::set(const std::string & str)
 {

src/libutil/config.hh

@@ -90,17 +90,12 @@ protected:
 
     virtual std::string to_string() = 0;
 
-    bool parseBool(const std::string & str);
-    std::string printBool(bool b);
-
     bool isOverriden() { return overriden; }
 };
 
-struct DefaultSettingTag { };
-
 /* A setting of type T. */
-template<typename T, typename Tag = DefaultSettingTag>
-class Setting : public AbstractSetting
+template<typename T>
+class BaseSetting : public AbstractSetting
 {
 protected:
 
@@ -108,23 +103,21 @@ protected:
 
 public:
 
-    Setting(Config * options,
-        const T & def,
+    BaseSetting(const T & def,
         const std::string & name,
         const std::string & description,
         const std::set<std::string> & aliases = {})
         : AbstractSetting(name, description, aliases)
         , value(def)
-    {
-        options->addSetting(this);
-    }
+    { }
 
     operator const T &() const { return value; }
     operator T &() { return value; }
     const T & get() const { return value; }
     bool operator ==(const T & v2) const { return value == v2; }
     bool operator !=(const T & v2) const { return value != v2; }
-    void operator =(const T & v) { value = v; }
+    void operator =(const T & v) { assign(v); }
+    virtual void assign(const T & v) { value = v; }
 
     void set(const std::string & str) override;
 
@@ -132,18 +125,35 @@ public:
 };
 
 template<typename T>
-std::ostream & operator <<(std::ostream & str, const Setting<T> & opt)
+std::ostream & operator <<(std::ostream & str, const BaseSetting<T> & opt)
 {
     str << (const T &) opt;
     return str;
 }
 
 template<typename T>
-bool operator ==(const T & v1, const Setting<T> & v2) { return v1 == (const T &) v2; }
+bool operator ==(const T & v1, const BaseSetting<T> & v2) { return v1 == (const T &) v2; }
+
+template<typename T>
+class Setting : public BaseSetting<T>
+{
+public:
+    Setting(Config * options,
+        const T & def,
+        const std::string & name,
+        const std::string & description,
+        const std::set<std::string> & aliases = {})
+        : BaseSetting<T>(def, name, description, aliases)
+    {
+        options->addSetting(this);
+    }
+
+    void operator =(const T & v) { this->assign(v); }
+};
 
 /* A special setting for Paths. These are automatically canonicalised
    (e.g. "/foo//bar/" becomes "/foo/bar"). */
-class PathSetting : public Setting<Path>
+class PathSetting : public BaseSetting<Path>
 {
     bool allowEmpty;
 
@@ -155,15 +165,17 @@ public:
         const std::string & name,
         const std::string & description,
         const std::set<std::string> & aliases = {})
-        : Setting<Path>(options, def, name, description, aliases)
+        : BaseSetting<Path>(def, name, description, aliases)
         , allowEmpty(allowEmpty)
     {
-        set(value);
+        options->addSetting(this);
     }
 
     void set(const std::string & str) override;
 
     Path operator +(const char * p) const { return value + p; }
+
+    void operator =(const Path & v) { this->assign(v); }
 };
 
 }