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Showing content from https://cplusplus.com/reference/future/ below:

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Future

Header with facilities that allow asynchronous access to values set by specific providers, possibly in a different thread.

Each of these providers (which are either promise or packaged_task objects, or calls to async) share access to a shared state with a future object: the point where the provider makes the shared state ready is synchronized with the point the future object accesses the shared state.

Classes Providers

promise: Promise (class template)

packaged_task: Packaged task (class template)

Futures

future: Future (class template)

shared_future: Shared future (class template)

Other types

future_error: Future error exception (class)

future_errc: Error conditions for future objects (enum class)

future_status: Return value for timed future operations (enum class)

launch: Launching policy for async (enum class)

Functions Providers

async: Call function asynchronously (function template)

Other functions

future_category: Return future category (function)

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