C ++模板化，静态分配的数组

Question

I'm trying to do something like this for a project...

template <class N> class MyClass { float properties[N]; };

Is there anyway to accomplish this in C++?

Answer 1

What you need is called value template parameter:

template <size_t N> class MyClass { float properties[N]; };
        //^^^^^^ note this 

Now you can instantiate this class template, passing any non-negative integral value as template argument. For example,

MyClass<10> c1;  //N=10
MyClass<100> c1; //N=100

You can pass const expression also as:

const size_t size = 200;
MyClass<size>  c2; //N=200