Directory Opus Manual

Vector

The Vector object is provided to address some short-comings in ActiveX scripting's array support. Some languages have better support than others for arrays, but the languages aren't consistent and some (like JScript) have incompatible arrays that Opus is unable to access at all. Therefore, any Opus scripting objects that take or return an array-like variable will use (or prefer to use) a Vector rather than an array.

A Vector object is mostly able to be used as a straight drop-in replacement for an arrays. They are collections and so can be enumerated, or accessed via index (e.g. Vector(4) to access the fifth element). They also have a number of helper methods to make manipulating them easier than arrays often are.

Note that in JScript you can access an element using square brackets (just like an array) or parentheses (as if it was a function parameter). In other languages, like VBScript, you can only use parentheses.

You can create a new Vector using the DOpusFactory.Vector method.

Property Name	Return Type	Description
capacity	int	Returns the capacity of the Vector (the number of elements it can hold without having to reallocate memory). This is not the same as the number of elements it currently holds, which can be 0 even if the capacity is something larger.
count	int	Returns the number of elements the Vector currently holds.
empty	bool	Returns True if the Vector is empty, False if not.
length	int	A synonym for count.
size	int	A synonym for count.

Method Name	Arguments	Return Type	Description
append	<Vector:from> <int:start> <int:end>	none	Copies the values of another Vector to the end of this one, preserving the existing values as well. If start and end are not provided, the entire Vector is appended - otherwise, only the specified elements are appended. Instead of a Vector object you can also pass a collection to this method and the contents of the collection will be copied to the end of the Vector. In JScript you can pass a standard array to this method to copy the array to the end of a Vector.
assign	<Vector:from> <int:start> <int:end>	none	Copies the value of another Vector to this one. If start and end are not provided, the entire Vector is copied - otherwise, only the specified elements are copied. Instead of a Vector object you can also pass a collection to this method and the contents of the collection will be copied to the Vector. In JScript you can pass a standard array to this method to copy the array into a Vector.
back	none	variant	Returns the last element in the Vector.
clear	none	none	Clears the contents of the Vector.
erase	<int:index>	none	Erases the element at the specified index.
exchange	<int:index1> <int:index2>	none	Exchanges the positions of the two specified elements.
front	none	variant	Returns the first element in the Vector.
insert	<int:index> <variant:value>	none	Inserts the provided value at the specified position.
pop_back	none	none	Removes the last element of the Vector.
push_back	<variant:value>	none	Adds the provided value to the end of the Vector.
reserve	<int:capacity>	none	Reserves space in the Vector for the specified number of elements (increases its capacity, although the count of elements remains unchanged). Note that Vectors grow dynamically - you don't have to specifically reserve or resize them. However if you want to add a large number of elements to a Vector it can be more efficient to reserve space for them first.
resize	<int:size>	none	Resizes the Vector to the specified number of elements. Any existing elements past the new size of the Vector will be erased.
reverse	none	none	Reverses the order of the elements held by the Vector.
shrink_to_fit	none	none	Reduces the capacity of the Vector to the number of elements it currently holds.
sort	none	none	Sorts the contents of the Vector. Strings and numbers are sorted alphabetically and numerically - other elements are grouped by type but not specifically sorted in any particular order.
unique	none	int	Removes all but one of any duplicate elements from the Vector. The number of elements removed is returned.

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