// Copyright ©2020 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !safe && !go1.24
// +build !safe,!go1.24

package iterator

import "unsafe"

// hiter's structure matches runtime.hiter's structure.
// Having a clone here allows us to embed a map iterator
// inside type mapIter so that mapIters can be re-used
// without doing any allocations.
//
//lint:ignore U1000 This is a verbatim copy of the runtime type.
type hiter struct {
	key         unsafe.Pointer
	elem        unsafe.Pointer
	t           unsafe.Pointer
	h           unsafe.Pointer
	buckets     unsafe.Pointer
	bptr        unsafe.Pointer
	overflow    *[]unsafe.Pointer
	oldoverflow *[]unsafe.Pointer
	startBucket uintptr
	offset      uint8
	wrapped     bool
	B           uint8
	i           uint8
	bucket      uintptr
	checkBucket uintptr
}

func (h *hiter) initialized() bool {
	return h.t != nil
}