Identifying elements

Describes how to identify elements within arrays.

Elements within arrays are identified by their logical position within the array.

Elements can also be accessed by key.

For all of the arrays except: RArray<class T>, RPointerArray<class T> and any of their specialisations, the key structure is defined independently of the array itself, using:

• a TKeyArrayFix object for arrays of same length elements.

• a TKeyArrayVar object for arrays of variable length elements.

• a TKeyArrayPak object for arrays of packed (variable length) elements.

Accessing an element by key requires the appropriate TKeyArrayFix, TKeyArrayVar or TKeyArrayPak object to be constructed and passed to the appropriate array class member function.

For the: RArray<class T>, RPointerArray<class T> arrays, keys are part of the array itself. These arrays also use the classes:

• TLinearOrder<class T> to define the ordering of two objects.

• TIdentityRelation<class T> to define the comparison of two objects.