Google Go error - "cannot make type"

Question

In my Go code I want to make an array of custom data type. I call

Blocks=make(*BlockData, len(blocks))

and I get error:

cannot make type *BlockData

my class BlockData contains such field types as uint64, int64, float32, string, []byte, []string and []*TransactionData. The last one is an array of pointers to another custom class of mine.

What should I do to fix this error?

Answer 1

make() is used to create slices, maps and channels. The type name must have [] before it when making a slice.

Use this to make a slice of pointers to BlockData.

Blocks = make([]*BlockData, len(blocks))

Read more in the Go language specification.

Answer 2

Making slices, maps and channels

For example,

package main

import "fmt"

type BlockData struct{}

func main() {
    blocks := 4
    Blocks := make([]*BlockData, blocks)
    fmt.Println(len(Blocks), Blocks)
}

Output:

4 [<nil> <nil> <nil> <nil>]