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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../thread/promise/get_future.html below:

std::promise<R>::get_future - cppreference.com

Returns a future object associated with the same shared state as *this.

An exception is thrown if *this has no shared state or get_future has already been called. To get multiple "pop" ends of the promise-future communication channel, use std::future::share.

Calls to this function do not introduce data races with calls to set_value, set_exception, set_value_at_thread_exit, or set_exception_at_thread_exit (therefore they need not synchronize with each other).

(none)

A future referring to the shared state of *this.

std::future_error on the following conditions:

• *this has no shared state. The error code is set to no_state.

• get_future() has already been called on a promise with the same shared state as *this. The error code is set to future_already_retrieved.

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