Chapter 3

1. What is the simplest lambda you can write?

The simplest lambda receives no parameters and returns a constant; it can be something like the following:

auto zero = [](){return 0;};

2. How can you write a lambda that concatenates two string values passed as parameters?

There are a few variations to this answer, depending on your preferred way of concatenating strings. The simplest way using STL is as follows:

auto concatenate = [](string first, string second){return first + second;};

3. What if one of the values is a variable that's captured by value?

The answer is similar to the preceding solution, but using the value from context:

auto concatenate = [first](string second){return first + second;};

Of course, we can also use the default capture by value notation, as follows:

auto concatenate = [=](string second){return first + second;};

4. What if one of the values is...