How to initialize all elements in an array to the same number in C++

Question

I\'m trying to initialize an int array with everything set at -1.

I tried the following, but it doesn\'t work. It only sets the first value at -1.

in         


        

Answer 1

If you are allowed to use std::array, you can do the following:

#include 
#include 
#include 
using namespace std;

template 
struct S_internal {
    template 
    static array init_array() {
        return S_internal::init_array();
    }
};

template 
struct S_internal {
    template 
    static array init_array() {
        static_assert(S == sizeof...(values), "");
        return array {{values...}};
    }
};

template 
struct init_array
{
    static array get() {
        return S_internal::init_array<>();
    }
};

void main()
{
    array ss = init_array::get();
    copy(cbegin(ss), cend(ss), ostream_iterator(cout, " "));
}

The output is:

77 77 77 77 77