如果大小未知，如何通过引用传递一维数组作为参数？

Question

I know that if you want to pass an array by reference with a known size you use

void add(char (&arr)[60])

But i only know that the array will be size between 1 and 60 inclusive. Any way to do this?

Answer 1

You can use a template to match any type and any size, and a static_assert to check the size of the array being passed at compile-time :

template<typename T, std::size_t N>
void add(T (&arr)[N])
{
    static_assert(N <= 60, "wrong size");
    // ...
}

Demo

Answer 2

other option , without using templates :

void add(char* arr , int size);

Remember that ad-hoc array names are "decaying" to be a pointer to the first element , so one-dimensional array can be passes as a pointer.