RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://en.cppreference.com/w/cpp/language/../memory/ranges/../../algorithm/ranges/fill_n.html below:

std::ranges::fill_n - cppreference.com

Assigns the given value to all elements in the range [first, first + n).

The function-like entities described on this page are algorithm function objects (informally known as niebloids), that is:

Explicit template argument lists cannot be specified when calling any of them.
None of them are visible to argument-dependent lookup.
When any of them are found by normal unqualified lookup as the name to the left of the function-call operator, argument-dependent lookup is inhibited.

[edit] Parameters first - the beginning of the range of elements to modify n - number of elements to modify value - the value to be assigned [edit] Return value

An output iterator that compares equal to first + n.

[edit] Complexity

Exactly n assignments.

[edit] Possible implementation [edit] Notes [edit] Example

#include <algorithm>
#include <complex>
#include <iostream>
#include <string>
#include <vector>
 
void println(const auto& v)
{
    for (const auto& elem : v)
        std::cout << ' ' << elem;
    std::cout << '\n';
}
 
int main()
{
    constexpr auto n{8};
 
    std::vector<std::string> v(n, "ââââ");
    println(v);
 
    std::ranges::fill_n(v.begin(), n, "ââââ");
    println(v);
 
    std::vector<std::complex<double>> nums{{1, 3}, {2, 2}, {4, 8}};
    println(nums);
    #ifdef __cpp_lib_algorithm_default_value_type
        std::ranges::fill_n(nums.begin(), 2, {4, 2});
    #else
        std::ranges::fill_n(nums.begin(), 2, std::complex<double>{4, 2});
    #endif
    println(nums);
}

Output:

 ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ
 ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ
 (1,3) (2,2) (4,8)
 (4,2) (4,2) (4,8)

[edit] See also assigns a range of elements a certain value
(algorithm function object)[edit] copies a number of elements to a new location
(algorithm function object)[edit] saves the result of a function in a range
(algorithm function object)[edit] applies a function to a range of elements
(algorithm function object)[edit] fills a range with random numbers from a uniform random bit generator
(algorithm function object)[edit] copy-assigns the given value to N elements in a range
(function template) [edit]

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4