stage_response

(EXPERIMENTAL) A variant-like type holding the response of a single pipeline stage.

class stage_response;

Name	Description
as_results	Retrieves the contained results or throws an exception.
as_statement	Retrieves the contained statement or throws an exception.
diag	Retrieves the contained diagnostics (lvalue reference accessor). — Retrieves the contained diagnostics (rvalue reference accessor).
error	Retrieves the contained error code.
get_results	Retrieves the contained results (unchecked accessor).
get_statement	Retrieves the contained statement (unchecked accessor).
has_results	Returns true if the object contains a results.
has_statement	Returns true if the object contains a statement.
stage_response [constructor]	Default constructor.

This is a variant-like type, similar to boost::system::result. At any point in time, it can contain:

A statement. Will happen if the stage was a prepare statement that succeeded.
A results. Will happen if the stage was a query or statement execution that succeeded.
An error_code, diagnostics pair. Will happen if the stage failed, or if it succeeded but it doesn't yield a value (as in close statement, reset connection and set character set).

This part of the API is experimental, and may change in successive releases without previous notice.

Convenience header <boost/mysql.hpp>