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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../utility/expected/error.html below:

constexpr const E& error() const& noexcept;

(1) (since C++23)

constexpr E& error() & noexcept;

(2) (since C++23)

constexpr const E&& error() const&& noexcept;

(3) (since C++23)

constexpr E&& error() && noexcept;

(4) (since C++23)

Accesses the unexpected value contained in *this.

If has_value() is true, the behavior is undefined.

(until C++26)

If has_value() is true:

If the implementation is hardened, a contract violation occurs. Moreover, if the contract-violation handler returns under âobserveâ evaluation semantic, the behavior is undefined.
If the implementation is not hardened, the behavior is undefined.

(since C++26) [edit] Return value [edit] Example [edit] See also

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