Setting: Remove "Tag" template argument

2 files changed, 38 insertions, 23 deletions

diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 6b9d077469c6..3242ef9d635e 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -73,7 +73,7 @@ unsigned int Settings::getDefaultCores()
 
 const string nixVersion = PACKAGE_VERSION;
 
-template<> void Setting<SandboxMode>::set(const std::string & str)
+template<> void BaseSetting<SandboxMode>::set(const std::string & str)
 {
     if (str == "true") value = smEnabled;
     else if (str == "relaxed") value = smRelaxed;
@@ -81,7 +81,7 @@ template<> void Setting<SandboxMode>::set(const std::string & str)
     else throw UsageError("option '%s' has invalid value '%s'", name, str);
 }
 
-template<> std::string Setting<SandboxMode>::to_string()
+template<> std::string BaseSetting<SandboxMode>::to_string()
 {
     if (value == smEnabled) return "true";
     else if (value == smRelaxed) return "relaxed";
@@ -89,27 +89,11 @@ template<> std::string Setting<SandboxMode>::to_string()
     else abort();
 }
 
-template<> void Setting<unsigned int, Settings::MaxBuildJobsTag>::set(const std::string & str)
+void MaxBuildJobsSetting::set(const std::string & str)
 {
     if (str == "auto") value = std::max(1U, std::thread::hardware_concurrency());
     else if (!string2Int(str, value))
         throw UsageError("configuration setting ‘%s’ should be ‘auto’ or an integer", name);
 }
 
-template<> std::string Setting<unsigned int, Settings::MaxBuildJobsTag>::to_string()
-{
-    return std::to_string(value);
-}
-
-template<> void Setting<bool, Settings::CaseHackTag>::set(const std::string & str)
-{
-    value = parseBool(str);
-    nix::useCaseHack = true;
-}
-
-template<> std::string Setting<bool, Settings::CaseHackTag>::to_string()
-{
-    return printBool(value);
-}
-
 }
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index d3ecaadb639a..b4f44de2e65d 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -13,6 +13,39 @@ typedef enum { smEnabled, smRelaxed, smDisabled } SandboxMode;
 
 extern bool useCaseHack; // FIXME
 
+struct CaseHackSetting : public BaseSetting<bool>
+{
+    CaseHackSetting(Config * options,
+        const std::string & name,
+        const std::string & description,
+        const std::set<std::string> & aliases = {})
+        : BaseSetting<bool>(useCaseHack, name, description, aliases)
+    {
+        options->addSetting(this);
+    }
+
+    void set(const std::string & str) override
+    {
+        BaseSetting<bool>::set(str);
+        nix::useCaseHack = true;
+    }
+};
+
+struct MaxBuildJobsSetting : public BaseSetting<unsigned int>
+{
+    MaxBuildJobsSetting(Config * options,
+        unsigned int def,
+        const std::string & name,
+        const std::string & description,
+        const std::set<std::string> & aliases = {})
+        : BaseSetting<unsigned int>(def, name, description, aliases)
+    {
+        options->addSetting(this);
+    }
+
+    void set(const std::string & str) override;
+};
+
 class Settings : public Config {
 
     unsigned int getDefaultCores();
@@ -66,8 +99,7 @@ public:
        the log to show if a build fails. */
     size_t logLines = 10;
 
-    struct MaxBuildJobsTag { };
-    Setting<unsigned int, MaxBuildJobsTag> maxBuildJobs{this, 1, "build-max-jobs",
+    MaxBuildJobsSetting maxBuildJobs{this, 1, "build-max-jobs",
         "Maximum number of parallel build jobs. \"auto\" means use number of cores."};
 
     Setting<unsigned int> buildCores{this, getDefaultCores(), "build-cores",
@@ -268,8 +300,7 @@ public:
     Setting<bool> enableImportFromDerivation{this, true, "allow-import-from-derivation",
         "Whether the evaluator allows importing the result of a derivation."};
 
-    struct CaseHackTag { };
-    Setting<bool, CaseHackTag> useCaseHack{this, nix::useCaseHack, "use-case-hack",
+    CaseHackSetting useCaseHack{this, "use-case-hack",
         "Whether to enable a Darwin-specific hack for dealing with file name collisions."};
 
     Setting<unsigned long> connectTimeout{this, 0, "connect-timeout",