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# std::shared_future::get

From cppreference.com
< cpp‎ | thread‎ | shared future

[edit template]

const T& get() const; | (1) | (member only of generic `shared_future` template) (since C++11)
T& get() const; | (2) | (member only of `shared_future<T&>` template specialization) (since C++11)
void get() const; | (3) | (member only of `shared_future<void>` template specialization) (since C++11)

The `get` method waits until the `shared_future` has a valid result and (depending on which template is used) retrieves it. It effectively calls wait() in order to wait for the result.

The generic template and two template specializations each contain a single version of `get`. The three versions of `get` differ only in the return type.

The behavior is undefined if valid() is false before the call to this function.

### [edit] Parameters

(none)

### [edit] Return value

1) Const reference to the value stored in the shared state. Accessing the value through this reference is undefined after the shared state has been destroyed.
2) Reference to the value in the shared state.
3) Nothing.

### [edit] Exceptions

If an exception was stored in the shared state referenced by the future (e.g. via a call to `std::promise::set_exception()`) then that exception will be thrown.

### [edit] Notes

The implementations are encouraged to detect the case when valid() is false before the call and throw a std::future_error with an error condition of std::future_errc::no_state.

### [edit] Example

| This section is incomplete Reason: no example

### [edit] See also

valid | checks if the future has a shared state (public member function) [edit]

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