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18 Vectors

A vector is an object that contains a sequence of arbitrary klisp objects. A vector has a length that is fixed at creation time, and as many objects, indexed from 0 to length-1. Compared to lists, klisp vectors use less size and have constant access time for any element.

Vectors may be mutable or immutable. If an attempt is made to mutate an immutable vector, an error is signaled. Two immutable vectors are “eq?” iff they are “equal?”. Two mutable vectors are “eq?” if they were created by the same constructor call. Two mutable vectors are “equal?” iff they have the same length and have “equal?” objects in each position. As is the case for lists, in order to handle possibly cyclic structures, the “equal?” algorithm considers vectors as FSMs where it position is a state change. There is only one empty vector (that is, a vector of length 0) and that vector is immutable. The vector type is encapsulated.

SOURCE NOTE: The report doesn't currently include vectors. They are taken from r7rs scheme.

— Applicative: vector? (vector? . objects)

The primitive type predicate for type vector. vector? returns true iff all the objects in objects are of type vector.

— Applicative: immutable-vector? (immutable-vector? objects)
— Applicative: mutable-vector? (mutable-vector? objects)

The primitive type predicates for types immutable vector and mutable vector. These return true iff all the objects in objects are of type immutable vector or mutable vector respectively.

— Applicative: make-vector (make-vector k [obj])

Applicative make-vector constructs and returns a new mutable vector of length k. If obj is specified, then all objects in the returned vector are obj, otherwise the content of the vector is unspecified.

— Applicative: vector-length (vector-length vector)

Applicative vector-length returns the length of vector.

— Applicative: vector-ref (vector-ref vector k)

Applicative vector-ref returns the object of vector at position k. If k is out of bounds (i.e. less than 0 or greater or equal than (vector-length vector)) an error is signaled.

— Applicative: vector-set! (vector-set! vector k obj)

Applicative vector-set! replaces the object with index k in vector with object obj. If k is out of bounds, or vector is immutable, an error is signaled. The result returned by vector-set! is inert.

— Applicative: vector (vector . objs)

Applicative vector contructs and return a new mutable vector composed of the object arguments.

— Applicative: vector->list (vector->list vector)
— Applicative: list->vector (list->vector objs)

These applicatives convert between vectors and lists. The objects returned by these applicatives are always mutable.

— Applicative: vector-copy (vector-copy vector)

Applicative vector-copy constructs and returns a new mutable vector with the same length and objects as vector.

— Applicative: vector->bytevector (vector->bytevector vector)
— Applicative: bytevector->vector (bytevector->vector bytevector)

These applicatives convert between vectors and bytevectors. If a vector containing objects other than exact integers between 0 and 255 inclusive are passed to vector->bytevector, an error is signaled. The objects returned by these applicatives are always mutable.

— Applicative: vector->string (vector->string vector)
— Applicative: string->vector (string->vector string)

These applicatives convert between vectors and strings. If a vector containing objects other than characters is passed to vector->string, an error is signaled. The objects returned by these applicatives are always mutable.

— Applicative: vector-copy! (vector-copy! vector1 vector2)

vector2 should have a length greater than or equal to that of vector1.

Copies the values in vector1 to the corresponding positions in vector2. If vector2 is immutable, an error is signaled. The result returned by vector-copy! is inert.

— Applicative: vector-copy-partial (vector-copy-partial vector k1 k2)

Both k1 & k2 should be valid indexes in vector. Also it should be the case that k1 <= k2.

Applicative vector-copy-partial constructs and returns a new mutable vector with length k2 - k1, with the objects from vector, starting at index k1 (inclusive) and ending at index k2 (exclusive).

— Applicative: vector-copy-partial! (vector-copy-partial! vector1 k1 k2 vector2 k3)

Both k1 & k2-1 should be valid indexes in vector1. Also it should be the case that k1 <= k2. Both k3 & k3 + (k2-k1) - 1 should be valid indexes in vector2.

Applicative vector-copy-partial! copies objects k1 (inclusive) through k2 (exclusive) from vector1 to the k2-k1 positions in vector2 starting at k3. If vector2 is an immutable vector, an error is signaled. The result returned by vector-copy-partial! is inert.

— Applicative: vector-fill! (vector-fill! vector obj)

Applicative vector-fill! replaces all the objects in vector with object obj. If vector is an immutable vector, an error is signaled. The result returned by vector-fill! is inert.

— Applicative: vector->immutable-vector (vector->immutable-vector vector)

Applicative vector->immutable-vector constructs and returns a new immutable vector with the same length and objects as vector.