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Coding Standards
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A resolve handler must meet the requirements for a handler.
A value h of a resolve handler
class should work correctly in the expression h(ec,
r),
where ec is an lvalue of
type const error_code
and r is an lvalue of type
const ip::basic_resolver_results<InternetProtocol>. InternetProtocol
is the template parameter of the ip::basic_resolver<> which is used to initiate
the asynchronous operation.