Modern Set SetIterator

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SetIterator

Holds a position in a Set; changing a value through it loses that value.

Syntax

SetIterator( of T )

Notes

• The iterator protocol -- IsValid, Value, MoveNext -- which is what for each is rewritten into. Ordinary code names the type only when the loop has to stop early, resume, or interleave with another.
• Value( ) is byref, but do not modify an element through it -- changing a value changes its hash, and the set would no longer find it.
• Iteration order is unspecified.

Examples

#import "std/containers"
using containers

dim seen as Set( of integer )
for i as integer = 1 to 3
    seen.Add( i )
next

dim it as SetIterator( of integer ) = seen.GetIterator( )
dim as integer total
while it.IsValid( )
    total += it.Value( )
    it.MoveNext( )
wend
print total                  '' 6

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Library: Set
Category: Set
Documented under: Members