Create a partial completion token adapter that captures error_code values to a variable.

partial_redirect_error redirect_error(
    asio::error_code & ec);
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Adapt a completion token to capture error_code values to a variable.

template<
    typename CompletionToken>
redirect_error_t< decay_t< CompletionToken > > redirect_error(
    CompletionToken && completion_token,
    asio::error_code & ec);
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Requirements

Header: asio/redirect_error.hpp

Convenience header: asio.hpp