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insert.go
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insert.go
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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package common
import "reflect"
func Insert(slice interface{}, pos int, value interface{}) interface{} {
v := reflect.ValueOf(slice)
insert := reflect.ValueOf(value)
if insert.Len() == 0 {
return v.Interface()
}
ne := reflect.MakeSlice(reflect.TypeOf(value), insert.Len(), insert.Len())
for i := 0; i < insert.Len(); i++ {
ne.Index(i).Set(insert.Index(i))
}
v = reflect.AppendSlice(v.Slice(0, pos), reflect.AppendSlice(ne, v.Slice(pos, v.Len())))
return v.Interface()
}