ArgsMan: Add Get*Arg functions returning optional

This allows the caller to not provide a default at all and just check
inside the optional to see if the arg was set or not.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/util/system.h b/src/util/system.h
index 07d7a533aa..04c66341d3 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -161,8 +161,13 @@ struct SectionInfo
 };
 
 std::string SettingToString(const util::SettingsValue&, const std::string&);
+std::optional<std::string> SettingToString(const util::SettingsValue&);
+
 int64_t SettingToInt(const util::SettingsValue&, int64_t);
+std::optional<int64_t> SettingToInt(const util::SettingsValue&);
+
 bool SettingToBool(const util::SettingsValue&, bool);
+std::optional<bool> SettingToBool(const util::SettingsValue&);
 
 class ArgsManager
 {
@@ -335,6 +340,7 @@ protected:
      * @return command-line argument or default value
      */
     std::string GetArg(const std::string& strArg, const std::string& strDefault) const;
+    std::optional<std::string> GetArg(const std::string& strArg) const;
 
     /**
      * Return path argument or default value
@@ -356,6 +362,7 @@ protected:
      * @return command-line argument (0 if invalid number) or default value
      */
     int64_t GetIntArg(const std::string& strArg, int64_t nDefault) const;
+    std::optional<int64_t> GetIntArg(const std::string& strArg) const;
 
     /**
      * Return boolean argument or default value
@@ -365,6 +372,7 @@ protected:
      * @return command-line argument or default value
      */
     bool GetBoolArg(const std::string& strArg, bool fDefault) const;
+    std::optional<bool> GetBoolArg(const std::string& strArg) const;
 
     /**
      * Set an argument if it doesn't already have a value