Using auto in loops c++
auto, c++, c++11, loops
Solution
A range based loop could be a cleaner solution:
for (const auto& i : a)
{
}
Here, `i` is a `const` reference to an element of container `a`.
Otherwise, if you need the index, or if you don't want to loop over the entire range, you can get the type with `decltype(a.size())`.
for (decltype(a.size()) i = 0; i < a.size(); ++i) {
}
Problem
I get warning signed/unsigned mismatch for the following code: ``` auto n = a.size(); for (auto i = 0; i < n; i++) { } ``` The problem is that by assigning 0 to `i` it becomes `int` rather than `size_t`. So what is better: ``` size_t n = a.size(); for (size_t i = 0; i < n; i++) { } ``` or this: ``` auto n = a.size(); for (size_t i = 0; i < n; i++) { } ``` or maybe you have a better solution? I like the first one more because it is bit more consistent, it just uses `size_t` rather than both `size_t` and `auto` for the same purpose.