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Showing content from https://cplusplus.com/reference/system_error/make_error_code/ below:

function

<system_error>

std::make_error_code 
error_code make_error_code (errc e) noexcept;

Make error code

Creates an error_code object (of the generic_category) from the errc enum value e.

It returns the same as


1
error_code(static_cast<int>(e),generic_category());

This function is called by error_code's constructor for error code enum types, and should be overloaded for all custom error code enum types defined in order to provide a mechanism to generate the appropriate error_code objects from them.

The standard library overloads this function for the io_errc and future_errc types: see make_error_code(io_errc) and make_error_code(future_errc).



Parameters
e
An enum value of type errc (see errc).

Return value An error_code object representing the enum value e.

See also
error_code::error_code
Construct error_code (public member function)

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