std::optional<T>::end

 

C++

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Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support (C++20) Contract support (C++26) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

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std::optional

Member functions

optional::optional

optional::~optional

optional::operator=

Observers

optional::operator->optional::operator*

optional::operator booloptional::has_value

optional::value

optional::value_or

Iterators

optional::begin (C++26)

optional::end (C++26)

Monadic operations

optional::and_then (C++23)

optional::transform (C++23)

optional::or_else (C++23)

Modifiers

optional::emplace

optional::swap

optional::reset

Non-member functions

operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20)

make_optional

swap(std::optional)

Deduction guides

Helper classes

hash<std::optional>

nullopt_t

in_place_t

bad_optional_access

Helper objects

nullopt

in_place

 

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

Run this code

#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

See also

begin (C++26)

returns an iterator to the beginning (public member function)

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