feat: add .Keys()

Add a new method to retrieve all keys in a given section.

Author: David Chu

ini/INIReader.h

@@ -249,6 +249,9 @@ class INIReader
     // Return the list of sections found in ini file
     const std::set<std::string> Sections() const;
 
+    // Return the list of keys in the given section
+    const std::set<std::string> Keys(std::string section) const;
+
     const std::unordered_map<std::string, std::string> Get(std::string section) const;
 
     template<typename T = std::string>
@@ -319,6 +322,16 @@ inline const std::set<std::string> INIReader::Sections() const
     return retval;
 }
 
+inline const std::set<std::string> INIReader::Keys(std::string section) const
+{
+    auto const _section = Get(section);
+    std::set<std::string> retval;
+    for (auto const& element : _section) {
+        retval.insert(element.first);
+    }
+    return retval;
+}
+
 inline const std::unordered_map<std::string, std::string> INIReader::Get(std::string section) const {
     auto const _section = _values.find(section);
     if (_section == _values.end()) {