When is it Best to Choose `std::size_t` Over `int` for Loops?

When to Utilize std::size_t

Question:

Is it advisable to substitute std::size_t for int in loops and other contexts?

Context:

Consider the following code snippet:

<code class="c++">#include <cstdint>

int main()
{
    for (std::size_t i = 0; i < 10; ++i) {
        // std::size_t OK here? Or should I use, say, unsigned int instead?
    }
}</code>

Answer:

Generally, std::size_t is optimal for loop conditions where comparisons are made against values inherently of this type.

Reasoning:

std::size_t is defined as the type of any sizeof expression. It is assured that it can represent the maximum size of any C object, including arrays. Consequently, it guarantees sufficient capacity for array indices, making it a natural choice for loop iterations based on array indices.

For example, in the given code snippet, since the loop variable i is used as an array index, std::size_t is the appropriate type to employ.

Exceptions:

In situations where simply counting to a predetermined number, it may be more suitable to utilize the variable's data type, int, or unsigned int (if the size is permissible), as they inherently match the machine's architecture.

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