std::promise::~promise - cppreference.com

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# std::promise::~promise

From cppreference.com
< cpp‎ | thread‎ | promise

~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 type std::future_error with an error condition std::future_errc::broken_promise, makes the shared state ready and releases it.

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