What constructor or overloaded operator= am I missing?

From: William Payne (mikas_n_o_s_p_a_m_493_at_student.liu.se)
Date: 03/31/04 

Date: Wed, 31 Mar 2004 18:30:31 +0200

Hello, using my simple string class called String, I noticed I cannot do:
String s = "hi";
without getting the following compilation error:
error: conversion from `const char[3]' to non-scalar type `String' requested

Here's the class declaration for String, what have I forgotten to implement
in order for the above line of code to compile:

class String
{
public:
   String()
      :
      m_internal_string(NULL),
      m_length(0)
   {
      ; /* Do nothing. */
   }

   explicit String(const char* s);

   explicit String(const String& s);

   virtual ~String()
   {
      delete [] m_internal_string;
   }

   size_t length() const
   {
      return m_length;
   }

   const char* c_str() const
   {
      return m_internal_string;
   }

   void clear();

   char operator[](std::size_t index) const;
   String& operator+=(const char* s);
   String& operator+=(const String& s);
   String& operator=(const char* s);
   String& operator=(const String& rhs);
   bool operator==(const String& rhs);
   friend std::ostream& operator<<(std::ostream& os, const String& s);
   friend std::istream& operator>>(std::istream& is, String& s);
private:
   char* m_internal_string;
   std::size_t m_length;
};

Thanks for any replies

/ William Payne

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