std::optional<T>::end

constexpr iterator end() noexcept;		(since C++26)
constexpr const_iterator end() const noexcept;		(since C++26)

Returns a past-the-end iterator. Equivalent to return begin() + has_value();.

Return value

Past-the-end iterator

Complexity

Constant.

Notes

Feature-test macro	Value	Std	Feature
`__cpp_lib_optional_range_support`	`202406L`	(C++26)	Range support for `std::optional`

Example

#include <optional>
#include <print>

int main()
{
    constexpr std::optional<int> none{std::nullopt}; // optional @1
    constexpr std::optional<int> some{42};           // optional @2

    static_assert(none.begin() == none.end());
    static_assert(some.begin() != some.end());

    // ranged-for loop support
    for (int i : none)
        std::println("Optional @1 has a value of {}", i);

    for (int i : some)
        std::println("Optional @2 has a value of {}", i);
}

Output:

Optional @2 has a value of 42

std::optional<T>::end

Return value

Complexity

Notes

Example

See also