On 26/03/07, Christian Henning
Hi there, is it somehow possible to access a sequence element at runtime? Just image you're reading some name value pairs from file and you would like them to assign them to a fusion sequences. This way I don't know they order the values are supplied. Is that possible?
Christian
I'm not a Fusion expert...but looking at the documentation, I think you'll find that operations on sequences are non-mutating - i.e. you have to construct a new sequence from the old sequence, but inserting a replacement value for the type specifier you've just found - for example, if you've just found an A() and you're inserting a_value: seq = seq_type(make_pair<A>(a_value), at<B>(seq)); similarly, altering the B value would be seq = seq_type(at<A>(seq), make_pair<B>(b_value)); You'd obviously also need some sort of run-time dispatching to call the appropriate seq updating function. Stuart Dootson