C++ High Performance

Iterating std::tuple

From a programmer's perspective it may seem that std::tuple can be iterated with a regular range-based for loop, just like any other container, as follows:

auto tpl = std::make_tuple(1, true, std::string{"Jedi"}); 
for(const auto& v: tpl) { std::cout << v << " "; } 

To be honest, I also think that most C++ programmers (including myself) have tried something like this at some point only to notice that it isn't possible. The reason it is not possible is that the type of const auto& v is only evaluated once, and since std::tuple contains elements of different types, this code simply does not compile.

The same goes for regular algorithms, as iterators don't mutate the type pointed to; therefore, std::tuple does not provide ...