32 Concurrency support library [thread]

32.10 Futures [futures]

32.10.4 Class future_error [futures.future.error]

namespace std { class future_error : public logic_error { public: explicit future_error(future_errc e); const error_code& code() const noexcept; const char* what() const noexcept; private: error_code ec_; // exposition only }; }

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explicit future_error(future_errc e);

Effects: Initializes ec_ with make_error_code(e).

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const error_code& code() const noexcept;

Returns: ec_.

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const char* what() const noexcept;

Returns: An ntbs incorporating code().message().