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37 lines
741 B
Go
37 lines
741 B
Go
package utils
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import "fmt"
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type HistoryBuffer[T any] struct {
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maxSize int
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items []T
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}
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func NewHistoryBuffer[T any](maxSize int) *HistoryBuffer[T] {
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return &HistoryBuffer[T]{
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maxSize: maxSize,
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items: make([]T, 0, maxSize),
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}
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}
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func (self *HistoryBuffer[T]) Push(item T) {
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if len(self.items) == self.maxSize {
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self.items = self.items[:len(self.items)-1]
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}
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self.items = append([]T{item}, self.items...)
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}
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func (self *HistoryBuffer[T]) PeekAt(index int) (T, error) {
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var item T
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if len(self.items) == 0 {
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return item, fmt.Errorf("Buffer is empty")
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}
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if len(self.items) <= index || index < -1 {
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return item, fmt.Errorf("Index out of range")
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}
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if index == -1 {
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return item, nil
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}
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return self.items[index], nil
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}
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