Lambda functions

[Alby94]

Error: candidates expects 2 arguments, 1 provided;
The first argument is saved or not?
Need something not declare an argument?

auto sum=[](int, int b) -> int 
{
    return (8 + b);
};
cout << sum(5) << endl;

[codewalker]

first argument needs to be passed though it will be unused in the lambda itself