std::expected<T,E>::value
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T is not cv void
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constexpr T& value() &;
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(1) | (since C++23) |
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constexpr const T& value() const&;
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(2) | (since C++23) |
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constexpr T&& value() &&;
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(3) | (since C++23) |
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constexpr const T&& value() const&&;
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(4) | (since C++23) |
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T is cv void
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constexpr void value() const&;
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(5) | (since C++23) |
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constexpr void value() &&;
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(6) | (since C++23) |
If *this contains an expected value, returns an reference to the contained value. Returns nothing if T is (possibly cv-qualified) void.
Otherwise, throws an exception of type std::bad_expected_access<std::decay_t<E>> that contains a copy of error().
3,4,6) If std::is_copy_constructible_v<E> or std::is_constructible_v<E, decltype(std::move(error()))> is false, the program is ill-formed.
Parameters
(none)
Return value
1-4) The expected value contained in *this.
5-6) (none)
Exceptions
1,2,5) Throws std::bad_expected_access(std::as_const(error())) if *this contains an unexpected value.
3,4,6) Throws std::bad_expected_access(std::move(error())) if *this contains an unexpected value.
Example
| This section is incomplete Reason: no example |
See also
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(C++23)
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returns the expected value if present, another value otherwise (public member function) |
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(C++23)
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accesses the expected value (public member function) |
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(C++23)
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returns the unexpected value (public member function) |
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(C++23)
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exception indicating checked access to an expected that contains an unexpected value(class template) |