std::array<T,N>::fill
Min standard notice:
Assigns the value to all elements in the container.
# Declarations
void fill( const T& value );
(since C++11) (constexpr since C++20)
# Parameters
value: the value to assign to the elements
# Return value
(none)
# Example
#include <array>
#include <cstddef>
#include <iostream>
int main()
{
constexpr std::size_t xy = 4;
using Cell = std::array<unsigned char, 8>;
std::array<Cell, xy * xy> board;
board.fill({0xE2, 0x96, 0x84, 0xE2, 0x96, 0x80, 0, 0}); // "▄▀";
for (std::size_t count{}; Cell c : board)
std::cout << c.data() << ((++count % xy) ? "" : "\n");
}