future_error( const future_error& other ) noexcept;
(1) (since C++11)
explicit future_error( std::future_errc ec );
(2) (since C++17)
1) Copy constructor. Initializes the contents of the new future_error object with those of other. If *this and other both have dynamic type std::future_error then std::strcmp(what(), other.what()) == 0.
2) Constructs a new future_error object containing the error code std::make_error_code(ec).


other - another future_error object to copy
ec - error code


There is no standard-compliant way for the user to construct a future_error other than copying from another future_error prior to C++17. C++11 and C++14 depict an exposition-only public constructor taking a std::error_code, and some implementations provide such a constructor.

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