operator-(ranges::zip_view::sentinel)

Computes the minimal distance between the underlying tuple of iterators of x and the underlying tuple of sentinels of y.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when zip_view::sentinel<Const> is an associated class of the arguments.

[edit] Parameters

[edit] Return value

Let current_ denote the underlying tuple of iterators of x, and end_ denote the underlying tuple of sentinels of y.

Let DIST(x, y, i) be a distance calculated by expression equivalent to std::get<i>(x.current_) - std::get<i>(y.end_) for some integer i.

[edit] Example

#include <cassert>
#include <deque>
#include <list>
#include <ranges>
#include <vector>
 
int main()
{
 auto x = std::vector {1, 2, 3, 4};
 auto y = std::deque {'a', 'b', 'c'};
 auto z = {1.1, 2.2};
 auto w = std::list {1, 2, 3};
 
 auto p = std::views::zip (x, y, z);
 assert (p.begin() - p.end() == +2);
 assert (p.end() - p.begin() == -2);
 
 [[maybe_unused]]
 auto q = std::views::zip (x, y, w);
 
 // The following code fires a compile-time error because std::list::iterator
 // does not support operator- that is needed to calculate the distance:
 // auto e = q.begin() - q.end();
}

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