Why is the number of elements in the array structure written in the same place as the data type?

Question

OOP

In C++, when declaring a template class, they write: If there is a constructor with parameters, then: But in the dynamic array data structure, they write: Where int is the data dip, and 7 is the number of elements. So why is 7 spelled there? And how can it be done the same way?
myClass<int> object;
myClass<int> object(3);
array<int, 7> myArray;

Answer 1

This is called Non Type Template Parameter (NTTP). You can only pass constants there (if you don't try to blow your brains out). You can declare such a template like this:

template <size_t size>
struct Array {
    MyClass data[size];
};

Array<5> a;
a.data[2] = ...;

I'll leave the definition of the methods as an exercise for the reader.
std::array has two template parameters: a type and a constant, so it applies not only to MyClass, but to any other types.