From 4410e9d995bcd53a7a4cff0bbee3917375adcba3 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 20 Apr 2017 16:52:53 +0200
Subject: Setting: Remove "Tag" template argument

---
 src/libutil/config.hh | 48 ++++++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 18 deletions(-)

(limited to 'src/libutil/config.hh')

diff --git a/src/libutil/config.hh b/src/libutil/config.hh
index 952bf04b8..130f59e2b 100644
--- a/src/libutil/config.hh
+++ b/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); }
 };
 
 }
-- 
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