Lambda Expressions in C++ | kmcgrath

joechung

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.

zproxy

Will extension methods also be there? Smiley

Thomas Petchel

In reply to joechung

#Jul 26th @ 1:06 AM

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. Devil

jalf

In reply to zproxy

#Jul 26th @ 10:58 PM

do we need them? Wink

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

neilfmorrow00
neilfmorrow

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,