我如何迭代变量？

Question

If I have the code:

T a;
T b;
T c;
// ...
T z;

How can I iterate through them without creating std::vector<T&> of them?

Any beautiful solution, something like (pseudo):

for (auto& it : [a, b, c, d, e, f]) {
    // ...
}

(Without copies.)

Answer 1

for (auto& var : {std::ref(a), std::ref(b), std::ref(c), std::ref(d), std::ref(e), std::ref(f)}) {
    // ...
}

Should do the job.

Answer 2

If you don't want to actually modify the "variables" then you might be able do something like

// TODO: Put your own variables here, in the order you want them
auto variables = { a, b, c, .... };

// Concatenate all strings
std::string result = std::accumulate(std::begin(variables), std::end(variables), "",
    [](std::string const& first, std::string const& second)
    {
        return first + ' ' + second;  // To add spacing
    });

Note that this requires all "variables" to be of the same type ( std::string ). If you have a variable that is not a string you can use std::to_string to convert them in the first step.