Why does std::array not have an constructor that takes a value for the array to be filled with?

Question

Is the absence of

std::array::array(const T& value);

an oversight? It seems mighty useful to me, and dynamic containers (

Answer 1

You may use std::index sequence for that:

namespace detail
{

    template 
    constexpr std::array
    make_array(const T& value, std::index_sequence)
    {
        return {{(static_cast(Is), value)...}};
    }
}

template 
constexpr std::array make_array(const T& value)
{
    return detail::make_array(value, std::make_index_sequence());
}

Demo

std::make_index_sequence is C++14, but can be implemented in C++11.

static_cast(Is) is to handle evil operator, that T might provide.