Page:4SIGHT manual- a computer program for modelling degradation of underground low level waste concrete vaults (IA 4sightmanualcomp5612snyd).pdf/97

17. The MATERIAL datatype is used for any material property that can be specified by the user. It carries a flag to denote whether the value is the default one, or the one specified by the user.

⟨User defined data types14⟩ $+\equiv$
 typedef struct {
   real value;
   boolean is_default;
 } MATERIAL;