inherit class template?

[audinue]

Btw, is there any tips to inherit class template?
I''m a little confusing on it.

template<typename T>class clsTemplate
{
public:
   clsTemplate(T i)
   {
      //...
   }
   void test()
   {
   }
};

class clsChild : clsTemplate<char>
{
public:
   clsChild(/* no parameters */) //??
   {
      //...
   }

   clsChild(char c) //??
   {
      //...
   }
   void test2()
   {
      test() //??
   }
};

I've got a LOT of errors when compiling code like that. Any suggestion please?

[Duthomhas]

I don't see anything horribly wrong, except that you aren't using public inheritance. (You should generally stick to public inheritance unless you know what you are doing...)

Here's how I tested it:

#include <iostream>
using namespace std;

template<typename T>class clsTemplate
{
public:
   T value;
   clsTemplate(T i)
   {
      this->value = i;
   }
   void test()
   {
      cout << value << endl;
   }
};

class clsChild : public clsTemplate<char>
{
public:
   clsChild(/* no parameters */): clsTemplate<char>( 0 )  // default char is NUL
   {
      ;
   }

   clsChild(char c): clsTemplate<char>( c )
   {
      ;
   }
   void test2()
   {
      test();
   }
};

int main()
  {
  clsTemplate <int> a( 42 );
  clsChild b( 'A' );

  a.test();   // should print "42"
  b.test();   // should print "A"
  b.test2();  // should print "A"

  return 0;
  }

When you are constructing descendent classes, it is generally a good idea to initialize the ancestor class in the constructor's initializer list, even if that is the only thing you do:

  clsChild():
    clsTemplate <char> ( ' ' )  // default char is SPACE
    { }

Hope this helps.

[audinue]

When you are constructing descendent classes, it is generally a good idea to initialize the ancestor class in the constructor's initializer list

It is applied to method/destructor too?

[Duthomhas]

No. Base class destructors are automagically called -- you don't need to do anything but worry about destructing stuff that belongs to this class.

Hope this helps.

[audinue]

Thanks Duoas ^_^ ...!
Thank you.