| Live Cells C++
    Reactive Programming for C++ | 
Cell option specifying that the cell, to which it is applied, should only notify its observers when its new value is not equal (by ==) to its previous value.  
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#include <changes_only_state.hpp>
Cell option specifying that the cell, to which it is applied, should only notify its observers when its new value is not equal (by ==) to its previous value.