#75 - Implement method CppStringT::substr()

Completed.

Author: schmouk

cpp-strings/cppstrings.cpp

@@ -29,10 +29,11 @@ using namespace pcs;
 */
 int main()
 {
-    CppString  s;
-    CppWString ws;
+    CppString  s("-5.1");
+    CppWString ws(L"-5.1");
 
     std::cout << ws.isupper() << std::endl;
+    std::cout << s.zfill(10).c_str() << std::endl;
 
     return 0;
 }

cpp-strings/cppstrings.h

@@ -146,6 +146,11 @@ namespace pcs // i.e. "pythonic c++ strings"
         inline CppStringT(const CharT* s, size_type count)                                  : MyBaseClass(s, count) {}
         inline CppStringT(std::initializer_list<CharT> ilist)                               : MyBaseClass(ilist) {}
 
+        inline CppStringT(const MyBaseClass& other)                                         : MyBaseClass(other) {}
+        inline CppStringT(const MyBaseClass& other, const AllocatorT& alloc)                : MyBaseClass(other, alloc) {}
+        inline CppStringT(MyBaseClass&& other)                                              : MyBaseClass(other) {}
+        inline CppStringT(MyBaseClass&& other, const AllocatorT& alloc)                     : MyBaseClass(other, alloc) {}
+
         template<class InputIt>
         inline CppStringT(InputIt first, InputIt last)                                      : MyBaseClass(first, last) {}
 
@@ -1334,6 +1339,17 @@ namespace pcs // i.e. "pythonic c++ strings"
         }
 
 
+        //---   substr()   ----------------------------------------
+        /** \brief Returns acopy of the string, starting at index start and ending after count characters. */
+        inline CppStringT substr(const size_type start, const size_type count) const noexcept
+        {
+            if (start > this->size())
+                return *this;
+            const size_type width = std::min(count, this->size() - start);
+            return CppStringT(MyBaseClass::substr(start, width));
+        }
+
+
         //---   swapcase()   --------------------------------------
         /** \brief Returns a copy of the string with uppercase characters converted to lowercase and vice versa.
         *