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From: Gavin Lambert (boost_at_[hidden])
Date: 2021-12-05 23:51:08

On 19/11/2021 04:57, Daggumati, Rajesh wrote:
> typedef boost::tuple<std::string, BinaryBuffer_t> DecodeErrorPayload_t;
> RegisterIONotification(NotifyType type;,boost::any payload)
> void RegisterIOThreaded::OnDecodeError( const std::string& error, BinaryBuffer_t data )
> {
> RegisterIONotification notify(RegisterIONotification::TypeDecodeError ,make_tuple(error, data));
> ASSERT_NO_THROW(payload = boost::any_cast<RegisterIONotification::DecodeErrorPayload_t>(notify.Payload));// Here its got failed...Please help me to fix this.

You have to be *very* careful about using type inference and implicit
casts when using boost::any. For example, it's entirely possible that
make_tuple is returning a type that is compatible with
DecodeErrorPayload_t but is not actually DecodeErrorPayload_t, which
will cause your later any_cast to fail. (Especially if you're calling
std::make_tuple rather than boost::make_tuple, which seems likely.)

You can inspect the payload in a debugger to determine what type it
actually is (although it can be hard to interpret). Or, (while
undocumented) it does contain a type() method that you can call and log
to inspect the actual type.

You may get better results if you explicitly static_cast your make_tuple
call to the type that you're expecting, or use uniform construction
syntax instead of make_tuple.

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