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std::operator<<(std::error_code) - cppreference.com
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std::operator<<(std::error_code)

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Utilities library
General utilities
Relational operators (deprecated in C++20)
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Defined in header <system_error>
template< class CharT, class Traits >
std::basic_ostream<CharT, Traits>&
    operator<<( basic_ostream<CharT, Traits>& os, const error_code& ec );
(since C++11)

Performs stream output operation on error code ec.

Equivalent to os << ec.category().name() << ':' << ec.value().

Parameters

os - output stream to insert data to
ec - error code

Return value

os


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