std::ranges:: views::repeat, std::ranges::

repeat_view models random_access_range. If Bound is not std::unreachable_sentinel_t, repeat_view also models sized_range and common_range

Customization point objects

The name views::repeat denotes a customization point object, which is a const function object of a literal semiregular class type. For exposition purposes, the cv-unqualified version of its type is denoted as __repeat_fn

All instances of __repeat_fn are equal. The effects of invoking different instances of type __repeat_fn on the same arguments are equivalent, regardless of whether the expression denoting the instance is an lvalue or rvalue, and is const-qualified or not (however, a volatile-qualified instance is not required to be invocable). Thus, views::repeat

Given a set of types Args..., if std::declval <Args> ( ) meet the requirements for arguments to views::repeat above, __repeat_fn models

• std::invocable<__repeat_fn, Args...>
• std::invocable < const __repeat_fn, Args...>
• std::invocable <__repeat_fn&, Args...>
• std::invocable < const __repeat_fn&, Args...> .
  

Otherwise, no function call operator of __repeat_fn participates in overload resolution.

Data members

Member functions

Deduction guides

Nested classes

Notes

Example

#include <iostream>
#include <ranges>
#include <string_view>
using namespace std::literals;
 
int main()
{
    // bounded overload
    for (auto s : std::views::repeat("C++"sv, 3))
        std::cout << s << ' ';
    std::cout << '\n';
 
    // unbounded overload
    for (auto s : std::views::repeat("I know that you know that"sv)
                | std::views::take(3))
        std::cout << s << ' ';
    std::cout << "...\n";
}

C++ C++ C++
I know that you know that I know that you know that I know that you know that ...

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also