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

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Containers library

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

span (C++20)

 

std::array

Member functions

Element access

array::at

array::operator[]

array::front

array::back

array::data

Iterators

array::beginarray::cbegin

array::endarray::cend

array::rbeginarray::crbegin

array::rendarray::crend

Capacity

array::empty

array::size

array::max_size

Modifiers

array::fill

array::swap

Non-member functions

get

std::swap

to_array (C++20)

operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Helper classes

tuple_size

tuple_element

Deduction guides(C++17)

 

void fill( const T& value );		(since C++11) (until C++20)
constexpr void fill( const T& value );		(since C++20)

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

Run this code

#include <array>
#include <iostream>
#include <algorithm>
 
int main()
{
    constexpr int 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} }); // "▄▀";
 
    std::for_each(board.cbegin(), board.cend(), [xy, O=1](const auto& c) mutable
    {
        std::cout << c.data() << ((O++ % xy) ? "" : "\n");
    });
}

Output:

▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀
▄▀▄▀▄▀▄▀

See also

fill	copy-assigns the given value to every element in a range (function template)
fill_n	copy-assigns the given value to N elements in a range (function template)