snapshot of https://github.com/cortezaproject/corteza.git (2024.9.x, 2026-09-18; blobs > 131072B omitted)

server/pkg/stack/stack.go

@@ -0,0 +1,37 @@
+package stack
+
+type Stack[T any] struct {
+	data []T
+	len  int
+}
+
+func (s *Stack[T]) Push(v T) {
+	if s.len == cap(s.data) {
+		// grow ~2x capacity
+		newCap := cap(s.data)*2 + 1
+		newData := make([]T, newCap)
+		copy(newData, s.data[:s.len])
+		s.data = newData
+	}
+	s.data[s.len] = v
+	s.len++
+}
+
+func (s *Stack[T]) Pop() (out T) {
+	if s.len == 0 {
+		return
+	}
+	s.len--
+
+	var zero T
+	out = s.data[s.len]
+	s.data[s.len] = zero
+
+	return
+}
+
+func (s *Stack[T]) Empty() bool { return s.Len() == 0 }
+func (s *Stack[T]) Len() int    { return s.len }
+func (s *Stack[T]) Cap() int    { return cap(s.data) }
+
+func (s *Stack[T]) Data() []T { return s.data[:s.len] }

server/pkg/stack/stack_test.go

@@ -0,0 +1,35 @@
+package stack
+
+import (
+	"testing"
+
+	"github.com/modern-go/reflect2"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStack(t *testing.T) {
+	var (
+		i1 = 1
+		i2 = 2
+		i3 = 3
+		i4 = 4
+		i5 = 5
+	)
+
+	s := Stack[*int]{}
+
+	s.Push(&i1)
+	s.Push(&i2)
+	s.Push(&i3)
+
+	require.Equal(t, &i3, s.Pop())
+
+	s.Push(&i4)
+	s.Push(&i5)
+
+	require.Equal(t, &i5, s.Pop())
+	require.Equal(t, &i4, s.Pop())
+	require.Equal(t, &i2, s.Pop())
+	require.Equal(t, &i1, s.Pop())
+	require.True(t, reflect2.IsNil(s.Pop()))
+}