もちろん！以下は、"n "個の辺を持ち、"sideLength "が各辺の長さである正多角形の周囲長を計算できるコードの一般的なバージョンである：

```cpp
/**
 * Calculates the perimeter of a regular polygon with "n" sides
 * and "sideLength" as the length of each side.
 *
 * @tparam T - The data type of the sideLength parameter (e.g., int, float, double, etc.).
 * @param sideLength - The length of each side of the polygon.
 * @param n - The number of sides of the polygon.
 * @return The perimeter of the polygon.
 */
template<typename T>
T calcPerimeter(T sideLength, int n)
{
    // The perimeter of a regular polygon is equal to the product of the number of sides and the length of each side.
    T perimeter = n * sideLength;

    return perimeter;
}
```
sideLengthパラメータに任意のデータ型（int、float、doubleなど）を渡すことができ、関数はそのデータ型の多角形の外周を計算します。さらに、多角形の辺の数を別のパラメータとして指定することもできます。
Sure! Here is the generic version of the code that can calculate the perimeter of any regular polygon with "n" sides and "sideLength" as the length of each side:

```cpp
/**
 * Calculates the perimeter of a regular polygon with "n" sides
 * and "sideLength" as the length of each side.
 *
 * @tparam T - The data type of the sideLength parameter (e.g., int, float, double, etc.).
 * @param sideLength - The length of each side of the polygon.
 * @param n - The number of sides of the polygon.
 * @return The perimeter of the polygon.
 */
template<typename T>
T calcPerimeter(T sideLength, int n)
{
    // The perimeter of a regular polygon is equal to the product of the number of sides and the length of each side.
    T perimeter = n * sideLength;

    return perimeter;
}
```
You can now pass any data type as the sideLength parameter (e.g., int, float, double, etc.), and the function will calculate the perimeter of the polygon for that data type. Additionally, you can also specify the number of sides of the polygon as a separate parameter.