add String::lastChar() method

svn-id: r10684

common/str.cpp

@@ -140,6 +140,10 @@ String &String::operator += (char c) {
 	return *this;
 }
 
+char lastChar() const {
+	return (_len > 0) ? _str[_len-1] : 0;
+}
+
 void String::deleteLastChar() {
 	if (_len > 0) {
 		ensureCapacity(_len - 1, true);

common/str.h

@@ -108,6 +108,7 @@ public:
 		return _str[idx];
 	}
 
+	char lastChar() const;
 	void deleteLastChar();
 	void deleteChar(int p);
 	void clear();