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std::future_error::future_error

From cppreference.com
< cpp‎ | thread‎ | future error
future_error( std::error_code ec ); // exposition only
(until C++17)
explicit future_error( std::future_errc ec );
(since C++17)

Constructs a new future error object containing error code ec (until C++17)std::make_error_code(ec) (since C++17).

[edit] Parameters

ec - error code