std::array fill() method

since C++20

// Non-const version only
constexpr void fill( const T& value );

until C++20

// Non-const version only
void fill( const T& value );

Assigns the given value value to all elements in the container.

Parameters

• value - the value to assign to the elements.

Return value

(none)

Complexity

Linear in the size of the container.

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");
    }
}

Possible output

▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀