Lambda Expressions in C++

The Discussion

• 

  Functions can maintain state if you use static to declare the variables, e.g.,

   

  int next()

  {

      static int gn = 0;

      return gn++;

  }

   

  I don't recommend doing this, but it is technically possible, contrary to what was stated in the video.

   

  Also, the second program Thomas wrote summed the primes in the range [3..20], not the first 20 prime numbers.

• 

  Will extension methods also be there?

• 

  Hi Joe,

   

  Yes, you're correct that you can use static variables to maintain state between function calls. Perhaps it's better to say that lambda expressions enable you to share state between a function and its caller, because a static local variable is only accessible from the scope of the function in which it is defined.

   

  You also caught me saying "the first 20 prime numbers". I realized later that I said this. Thanks for the correction.

   

   

• 

  do we need them?

  C++ allows non-member functions. Problem solved.

   

• 

  I think lambda are great!!! I wish more people would learn how to use them when they first start learning how to program.  I sometimes find when you are teaching the basics of computer programming to beginning programmers the old-style methods are usually the best,

• 

  By the way, prime numbers start with 2, not 3!

• 

  Where did the high quality video version go ?I can't see the text ! 

• 

  I cant see the code in the video, can you please send me the code.