Applying functions on tuples
Since C++11, the STL provides std::tuple. This type allows us to sporadically bundle multiple values into a single variable and reach them around. The notion of tuples has been there for a long time in a lot of programming languages, and some recipes in this book are already devoted to this type because it is extremely versatile to use.
However, we sometimes end up with values bundled up in a tuple and then need to call functions with their individual members. Unpacking the members individually for every function argument is very tedious (and error-prone if we introduce a typo somewhere). The tedious form looks like this: func(get<0>(tup), get<1>(tup), get<2>(tup), ...);.
In this recipe, you will learn how to pack and unpack values to and from tuples in an elegant way, in order to call some functions that don't know about tuples.
How to do it...
We are going to implement a program that packs and unpacks values to and from tuples. Then, we will see...
