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sequenceequal.go
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sequenceequal.go
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package go2linq
import (
"github.com/solsw/collate"
"github.com/solsw/errorhelper"
)
// Reimplementing LINQ to Objects: Part 34 - SequenceEqual
// https://codeblog.jonskeet.uk/2011/01/14/reimplementing-linq-to-objects-part-34-sequenceequal/
// https://learn.microsoft.com/dotnet/api/system.linq.enumerable.sequenceequal
// [SequenceEqual] determines whether two sequences are equal by comparing the elements using [collate.DeepEqualer].
//
// [SequenceEqual]: https://learn.microsoft.com/dotnet/api/system.linq.enumerable.sequenceequal
func SequenceEqual[Source any](first, second Enumerable[Source]) (bool, error) {
if first == nil || second == nil {
return false, errorhelper.CallerError(ErrNilSource)
}
return SequenceEqualEq(first, second, nil)
}
// SequenceEqualMust is like [SequenceEqual] but panics in case of error.
func SequenceEqualMust[Source any](first, second Enumerable[Source]) bool {
return errorhelper.Must(SequenceEqual(first, second))
}
// [SequenceEqualEq] determines whether two sequences are equal by comparing their elements using a specified equaler.
// If 'equaler' is nil, [collate.DeepEqualer] is used.
//
// [SequenceEqualEq]: https://learn.microsoft.com/dotnet/api/system.linq.enumerable.sequenceequal
func SequenceEqualEq[Source any](first, second Enumerable[Source], equaler collate.Equaler[Source]) (bool, error) {
if first == nil || second == nil {
return false, errorhelper.CallerError(ErrNilSource)
}
counter1, ok1 := first.(Counter)
if ok1 {
counter2, ok2 := second.(Counter)
if ok2 && (counter1.Count() != counter2.Count()) {
return false, nil
}
}
if equaler == nil {
equaler = collate.DeepEqualer[Source]{}
}
enr1 := first.GetEnumerator()
enr2 := second.GetEnumerator()
for enr1.MoveNext() {
if !enr2.MoveNext() {
return false, nil
}
if !equaler.Equal(enr1.Current(), enr2.Current()) {
return false, nil
}
}
if enr2.MoveNext() {
return false, nil
}
return true, nil
}
// SequenceEqualEqMust is like [SequenceEqualEq] but panics in case of error.
func SequenceEqualEqMust[Source any](first, second Enumerable[Source], equaler collate.Equaler[Source]) bool {
return errorhelper.Must(SequenceEqualEq(first, second, equaler))
}