std::promise<R>::~promise

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atomic_flag_notify_one (C++20)
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std::promise

Member functions
promise::promise
promise::~promise
promise::operator=
promise::swap
Getting the result
promise::get_future
Setting the result
promise::set_value
promise::set_value_at_thread_exit
promise::set_exception
promise::set_exception_at_thread_exit
Non-member Functions
swap(std::promise)
Helper Classes
uses_allocator<std::promise>

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~promise();		(since C++11)

Abandons the shared state:

if the shared state is ready,releases it.
if the shared state is not ready, stores an exception object of typestd::future_error with an error conditionstd::future_errc::broken_promise, makes the shared state ready and releases it.

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