std::experimental::optional<T>::operator->, std::experimental::optional<T>::
From cppreference.com
< cpp | experimental | optional
|
constexpr
const T* operator-
>
(
)
const
;
|
(1) | (library fundamentals TS) |
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constexpr T* operator->();
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(1) | (library fundamentals TS) |
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constexpr
const T& operator*
(
)
const
&
;
|
(2) | (library fundamentals TS) |
|
constexpr T& operator*
(
)
&
;
|
(2) | (library fundamentals TS) |
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constexpr
const T&& operator*
(
)
const
&&
;
|
(2) | (library fundamentals TS) |
|
constexpr T&& operator*
(
)
&&
;
|
(2) | (library fundamentals TS) |
Accesses the contained value.
1) Returns a pointer to the contained value.
2) Returns a reference to the contained value.
The behavior is undefined if *this does not contain a value.
Parameters
(none)
Return value
Pointer or reference to the contained value.
Exceptions
Throws nothing.
Notes
This operator does not check whether the optional contains a value. If checked access is needed, value() or value_or()
Example
Run this code
#include <experimental/optional> #include <iostream> #include <string> using namespace std::literals; int main() { std::experimental::optional<int> opt1 = 1; std::cout << *opt1 << '\n'; std::experimental::optional<std::string> opt2 = "abc"s; std::cout << opt2->size() << '\n'; }
Output:
1 3
See also
| returns the contained value (public member function) |
|
| returns the contained value if available, another value otherwise (public member function) |