C++ Copy Constructor Syntax

Question

I apologize in advance, my C++ is rusty...

What does

: m_nSize(sizeof(t1))

mean in the following section?

class CTypeSize
{
   public:
      template<class T>
      CTypeSize(const T &t1) :
      m_nSize(sizeof(t1))
      {
      }
      ~CTypeSize(void){ };
      int getSize(void) const{ return m_nSize; }
   private:
      const int m_nSize;
};

I understand copy constructors, but I remember the syntax as Class::Class(const Class& p). Am I thinking of something else, or is that an alternative syntax?

Thanks!

Answer 1

It has nothing todo with copy ctor. You are initializing the variable m_nSize using initializer list with the sizeof the template argument t1.