string: add to_upper

string.hpp

@@ -19,6 +19,38 @@
 namespace cruft {
     std::string to_utf8 (const wchar_t*);
     std::string to_utf8 (const std::wstring&);
+
+
+    /// Convert the provided string to all upper case
+    inline std::string
+    to_upper (std::string &&val)
+    {
+        std::transform (
+            std::begin (val),
+            std::end   (val),
+            std::begin (val),
+            ::toupper
+        );
+        return std::move (val);
+    }
+
+
+    /// Convert the provided string to all upper case
+    inline std::string
+    to_upper (std::string const &val)
+    {
+        std::string res;
+        res.reserve (val.size ());
+
+        std::transform (
+            std::begin (val),
+            std::end   (val),
+            std::back_inserter (res),
+            ::toupper
+        );
+
+        return res;
+    }
 }