References

• https://en.cppreference.com/w/cpp/language/templates
• We will be studing about only function templates and abbreviated function template using keyword 'auto' which is also explained in above link(auto is just c++20 feature).

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Main points

• Templates have been introduced in 1991.
• we use templates like:

  		template <typename/class T>  //we can use the keywords typename or class 
  		T function_name(T parameter_names) // scope of T is within the function only. 
  		{
  
  		}
  
  
  

• we can use template using keyword auto which is just c++20 feature only.(compile with -std = c++20 )

  		auto function_name(auto parameter_names)
  		{
  		// function body; note that 'auto' will deduce the type for us. 	
  		}
  

• Instantiation It is process of making codes by compiler, In previous lecture 1 we saw that the compiler was make codes for us, and that is known as Instantiation.