1 files changed, 7 insertions, 1 deletions
diff --git a/include/cru/common/String.hpp b/include/cru/common/String.hpp
index 86e0a134..0ae223cf 100644
--- a/include/cru/common/String.hpp
+++ b/include/cru/common/String.hpp
@@ -165,7 +165,10 @@ class CRU_BASE_API String {
   }
   inline void append(StringView str);
 
-  String substr(size_type start, size_type size) const {
+  String substr(size_type start, size_type size = -1) const {
+    if (size == -1) {
+      size = this->size_ - start;
+    }
     return String(this->buffer_ + start, size);
   }
 
@@ -189,6 +192,9 @@ class CRU_BASE_API String {
 
   std::vector<String> SplitToLines(bool remove_space_line = false) const;
 
+  bool StartWith(StringView str) const;
+  bool EndWith(StringView str) const;
+
  public:
   void AppendCodePoint(CodePoint code_point);