Node:Array operations, Next:, Previous:Scheme types in Java, Up:Low-level functions



Low-level Operations on Java Arrays

The following macros evaluate to procedures that can be used to manipulate primitive Java array objects. The compiler can inline each to a single bytecode instruction (not counting type conversion).

primitive-array-new element-type Syntax
Evaluates to a one-argument procedure. Applying the resulting procedure to an integer count allocates a new Java array of the specified length, and whose elements have type element-type.

primitive-array-set element-type Syntax
Evaluates to a three-argument procedure. The first argument of the resulting procedure must be an array whose elements have type element-type; the second argument is an index; and the third argument is a value (coercible to element-type) which replaces the value specified by the index in the given array.

primitive-array-get element-type Syntax
Evaluates to a two-argument procedure. The first argument of the resulting procedure must be an array whose elements have type element-type; the second argument is an index. Applying the procedure returns the element at the specified index.

primitive-array-length element-type Syntax
Evaluates to a one-argument procedure. The argument of the resulting procedure must be an array whose elements have type element-type. Applying the procedure returns the length of the array. (Alternatively, you can use (field array 'length).)