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std::array<T,N>:: fill

From cppreference.net
C++
Containers library
std::array
void fill ( const T & value ) ;
(since C++11)
(constexpr since C++20)

Assigns the value to all elements in the container.

Contents

Parameters

value - the value to assign to the elements

Return value

(none)

Complexity

Linear in the size of the container.

Example

Run this code 
#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: 

▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀

See also

copy-assigns the given value to every element in a range
(function template)
copy-assigns the given value to N elements in a range
(function template)
(C++20)
assigns a range of elements a certain value
(algorithm function object)