Yorick Reference Card

Home Manual Packages Global Index Keywords Quick Reference Language Reference Function Reference Including Source Files Comments Issuing Shell Commands Matrix Multiplication Information About Variables Elementary Functions Advanced Array Indexing Index Range Functions Logical Functions Interpolation and Lookup Functions Sorting Transposing Manipulating Strings Generating Simple Meshes Using Pointers Instancing Data Structures Reshaping Arrays I/O Reference | # Yorick Function Reference ## Using Pointers A scalar of type `pointer` points to a Yorick array of any data type or dimensions. Unary `&` returns a `pointer` to its argument, which can be any array valued expression. Unary `*` dereferences its argument, which must be a scalar of type `pointer`, returning the original array. A dereferenced pointer may itself be an array of type `pointer`. The unary `&` and `*` bind more tightly than any other Yorick operator except `.` and `->` (the member extraction operators), and array indexing x `(..)`: `&`expr return a scalar `pointer` to expr `*`expr dereference expr, a scalar pointer Since a `pointer` always points to a Yorick array, Yorick can handle all necessary memory management. Dereference `*` or `->`, copy by assignment `=`, or compare to another pointer with `==` or `!=` are the only legal operations on a `pointer`. A pointer to a temporary expr makes sense and may be useful. The purpose of the `pointer` data type is to deal with several related objects of different types or shapes, where the type or shape changes, making `struct` inapplicable.