how to initialize a fixed size array and assign elements with a constexpr function in C++11 or with help of boost

Question

Possible Duplicate:
Programmatically create static arrays at compile time in C++

I have lots of data to be stored in a fixed array, with its elements depend on position. The value of each element can be calculated at compile time.

My code is almost like:

int fun(int p) // maybe constexpr
{
    return 0x1<<p;
}

int a[17] = {
    repeat_fun_from_0_to_16();
};

Since all of the value can be determined at compile time, there should be a way to do this, I guess.

I also checked out there's a repeat() in boost.assignment, but don't know how to use it with this situation.

This http://stackoverflow.com/questions/12108390/c11-compile-time-calculation-of-array and this http://stackoverflow.com/questions/2978259/programmatically-create-static-arrays-at-compile-time-in-c?lq=1 may help — , Dec 28 '12 at 12:02
Thanks, @aleguna ! I've figured out this with the second link. — liuyanghejerry, Dec 28 '12 at 12:27

score 1 · Accepted Answer · edited May 23 '17 at 12:18

1

Thanks to @aleguna , I've solved this problem by this answer.

All I need to change is the meta function:

template<size_t index> struct MetaFunc { 
    enum { value = index << 1 }; 
};

edited May 23 '17 at 12:18

Community

answered Dec 28 '12 at 12:29

liuyanghejerry

1 Answers1