NAME¶

std::ranges::drop_while_view::pred - std::ranges::drop_while_view::pred

Synopsis¶

constexpr const Pred& pred() const; (since C++20)

Returns a reference to the stored predicate.

If *this does not store a predicate (e.g. an exception is thrown on the assignment
to *this, which copy-constructs or move-constructs a Pred), the behavior is
undefined.

Parameters¶

(none)

Return value¶

a reference to the stored predicate

Example¶

// Run this code

#include <array>
#include <iostream>
#include <iomanip>
#include <ranges>

int main()
{
constexpr std::array data{ 0, -1, -2, 3, 1, 4, 1, 5, };

auto view = std::ranges::drop_while_view{
data, [](int x) { return x <= 0; }
};

std::cout << std::boolalpha;
for (int x: data) {
std::cout << "predicate(" << std::setw(2) << x << ") : "
<< view.pred()(x) << '\n';
}
}

Output:¶

predicate( 0) : true
predicate(-1) : true
predicate(-2) : true
predicate( 3) : false
predicate( 1) : false
predicate( 4) : false
predicate( 1) : false
predicate( 5) : false