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.
(none).
a reference to the stored predicate.
#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
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