[go-nuts] Why does assigning a function variable to a method value allocate memory?

[MartinG]

Hi,

In the below code example, setting a function variable to a simple function 
makes no memory allocation and is very fast (<1ns).  The case of setting 
the same function variable to a method value is much slower (~30ns) and it 
turns out to be because memory is allocated there. (16 B/op)

I found this surprising.  Can anyone explain why memory is allocated and is 
there a way to avoid this?

Thanks.

-- 
Martin.


package main

import "testing"

func BenchmarkStandAlone(b *testing.B) {
    b.ReportAllocs()
    for i := 0; i < b.N; i++ {
        f1 = standalone
    }
}

func BenchmarkMethod(b *testing.B) {
    b.ReportAllocs()
    for i := 0; i < b.N; i++ {
        f1 = myObj.myMethod
    }
}

var (
    f1    func()
    myObj = &myType{}
)

func standalone() {}

type myType struct{}

func (m *myType) myMethod() {}

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