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std::ranges::views::transform, std::ranges::transform_view - cppreference.com

std::ranges::transform_view (1) (since C++20)
(until C++23) (since C++23) namespace views { inline constexpr /*unspecified*/ transform = /*unspecified*/; } (2) (since C++20)

Call signature

(since C++20)

template< class F > constexpr /*range adaptor closure*/ transform( F&& fun );

(since C++20) 1)

A range adaptor that represents

view

of an underlying sequence after applying a transformation function to each element.

transform_view models the concepts random_access_range, bidirectional_range, forward_range, input_range, common_range, and sized_range when the underlying view V models respective concepts.

[edit] Data members Member Description V base_ (private) the underlying view
(exposition-only member object*) copyable-box<F>(until C++23)movable-box<F>(since C++23) fun_ (private) the underlying function object
(exposition-only member object*) [edit] Member functions constructs a transform_view
(public member function) [edit] returns a copy of the underlying (adapted) view
(public member function) [edit] returns an iterator to the beginning
(public member function) [edit] returns an iterator or a sentinel to the end
(public member function) [edit] returns the number of elements, provided only if the underlying (adapted) range satisfies sized_range
(public member function) [edit] returns the approximate size of the resulting approximately_sized_range
(public member function) [edit] Inherited from std::ranges::view_interface returns whether the derived view is empty, provided only if it satisfies sized_range or forward_range
(public member function of std::ranges::view_interface<D>) [edit] returns a constant iterator to the beginning of the range
(public member function of std::ranges::view_interface<D>) [edit] returns a sentinel for the constant iterator of the range
(public member function of std::ranges::view_interface<D>) [edit] returns whether the derived view is not empty, provided only if ranges::empty is applicable to it
(public member function of std::ranges::view_interface<D>) [edit] returns the first element in the derived view, provided if it satisfies forward_range
(public member function of std::ranges::view_interface<D>) [edit] returns the last element in the derived view, provided only if it satisfies bidirectional_range and common_range
(public member function of std::ranges::view_interface<D>) [edit] returns the n^th element in the derived view, provided only if it satisfies random_access_range
(public member function of std::ranges::view_interface<D>) [edit] [edit] Deduction guides [edit] Nested classes the iterator type
(exposition-only member class template*) the sentinel type
(exposition-only member class template*) [edit] Example

#include <algorithm>
#include <cstdio>
#include <iterator>
#include <ranges>
#include <string>
 
char rot13a(const char x, const char a)
{
    return a + (x - a + 13) % 26;
}
 
char rot13(const char x)
{
    if ('Z' >= x and x >= 'A')
        return rot13a(x, 'A');
 
    if ('z' >= x and x >= 'a')
        return rot13a(x, 'a');
 
    return x;
}
 
int main()
{
    auto show = [](const unsigned char x) { std::putchar(x); };
 
    std::string in{"cppreference.com\n"};
    std::ranges::for_each(in, show);
    std::ranges::for_each(in | std::views::transform(rot13), show);
 
    std::string out;
    std::ranges::copy(std::views::transform(in, rot13), std::back_inserter(out));
    std::ranges::for_each(out, show);
    std::ranges::for_each(out | std::views::transform(rot13), show);
}

Output:

cppreference.com
pccersrerapr.pbz
pccersrerapr.pbz
cppreference.com

[edit] See also

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