// Copyright 2016 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.

package gomobile_bind

// Go support functions for generated Go bindings. This file is
// copied into the generated package, gomobile_bind, and compiled
// along with the bindings.

// #include <stdlib.h>
// #include "seq.h"
import "C"

import (
	"errors"
	"fmt"

	_seq "golang.org/x/mobile/bind/seq"
)

func toError(s string) error {
	if s == "" {
		return nil
	}
	return errors.New(s)
}

func init() {
	_seq.FinalizeRef = func(ref *_seq.Ref) {
		refnum := ref.Bind_Num
		if refnum < 0 {
			panic(fmt.Sprintf("not a foreign ref: %d", refnum))
		}
		C.go_seq_dec_ref(C.int32_t(refnum))
	}
	_seq.IncForeignRef = func(refnum int32) {
		if refnum < 0 {
			panic(fmt.Sprintf("not a foreign ref: %d", refnum))
		}
		C.go_seq_inc_ref(C.int32_t(refnum))
	}
}

// IncGoRef is called by foreign code to pin a Go object while its refnum is crossing
// the language barrier
//export IncGoRef
func IncGoRef(refnum C.int32_t) {
	_seq.Inc(int32(refnum))
}