Added GetBoolean() to C++ API.

Used std::transform() to convert strings to lower instead of for loop.

cpp/INIReader.cpp

@@ -1,5 +1,6 @@
 // Read an INI file into easy-to-access name/value pairs.
 
+#include <algorithm>
 #include <cctype>
 #include <cstdlib>
 #include "../ini.h"
@@ -33,12 +34,24 @@ long INIReader::GetInteger(string section, string name, long default_value)
     return end > value ? n : default_value;
 }
 
+bool INIReader::GetBoolean(string section, string name, bool default_value)
+{
+    string valstr = Get(section, name, "");
+    // Convert to lower case to make string comparisons case-insensitive
+    std::transform(valstr.begin(), valstr.end(), valstr.begin(), ::tolower);
+    if (valstr == "true" || valstr == "yes" || valstr == "on" || valstr == "1")
+        return true;
+    else if (valstr == "false" || valstr == "no" || valstr == "off" || valstr == "0")
+        return false;
+    else
+        return default_value;
+}
+
 string INIReader::MakeKey(string section, string name)
 {
     string key = section + "." + name;
-    // Convert to lower case to make lookups case-insensitive
-    for (int i = 0; i < key.length(); i++)
-        key[i] = tolower(key[i]);
+    // Convert to lower case to make section/name lookups case-insensitive
+    std::transform(key.begin(), key.end(), key.begin(), ::tolower);
     return key;
 }
 

cpp/INIReader.h

@@ -29,9 +29,14 @@ public:
                     std::string default_value);
 
     // Get an integer (long) value from INI file, returning default_value if
-    // not found.
+    // not found or not a valid integer (decimal "1234", "-1234", or hex "0x4d2").
     long GetInteger(std::string section, std::string name, long default_value);
 
+    // Get a boolean value from INI file, returning default_value if not found or if
+    // not a valid true/false value. Valid true values are "true", "yes", "on", "1",
+    // and valid false values are "false", "no", "off", "0" (not case sensitive).
+    bool GetBoolean(std::string section, std::string name, bool default_value);
+
 private:
     int _error;
     std::map<std::string, std::string> _values;

cpp/INIReaderTest.cpp

@@ -14,6 +14,7 @@ int main()
     std::cout << "Config loaded from 'test.ini': version="
               << reader.GetInteger("protocol", "version", -1) << ", name="
               << reader.Get("user", "name", "UNKNOWN") << ", email="
-              << reader.Get("user", "email", "UNKNOWN") << "\n";
+              << reader.Get("user", "email", "UNKNOWN") << ", active="
+              << reader.GetBoolean("user", "active", true) << "\n";
     return 0;
 }