Bug with encoding multi-field with condition.

[AngryJew911]

med/med/sequence.hpp

Line 155 in 0d96da3

while (typename IE::condition{}(to));

Case:

struct MySeq : med::sequence<
    M<Flag>,
    O<Case1, Flag::is_case1>, // is_case1 returns true if Flag.get() == 1
    O<Case2, Flag::is_case2, med::inf>// is_case1 returns true if Flag.get() == 2
>
struct Msg : med::sequence<
    M<L, MySeq>
>
{
};

Decoder will try to decode Case2 until the end of Msg, but not end of MySeq with specified length. Probably, it happens because the loop

med/med/sequence.hpp

Line 155 in 0d96da3

while (typename IE::condition{}(to));

doesn't check decoder(CHECK_STATE{}, ie) and IE::condition{}(to) return constant value for specific Msg. So loop ends only when decoding one more Case2 fails.