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package main
type Thing struct {
name string
}
type ThingOption func(*Thing)
func WithName(name string) ThingOption {
return func(t *Thing) {
t.name = name
}
}
func NewThing(opts ...ThingOption) *Thing {
t := &Thing{}
for _, opt := range opts {
opt(t)
}
return t
}
func (t Thing) String() string {
return t.name
}
func (t Thing) Print(arg string) {
println("Thing.Print:", t.name, "arg:", arg)
}
type Printer interface {
Print(string)
}
func main() {
thing := &Thing{"foo"}
// function pointers
runFunc(hello, 5) // must be indirect to avoid obvious inlining
// deferred functions
testDefer()
// defers in loop
testDeferLoop()
//defer func variable call
testDeferFuncVar()
//More complicated func variable call
testMultiFuncVar()
// Take a bound method and use it as a function pointer.
// This function pointer needs a context pointer.
testBound(thing.String)
// closures
func() {
println("thing inside closure:", thing.String())
}()
runFunc(func(i int) {
println("inside fp closure:", thing.String(), i)
}, 3)
// functional arguments
thingFunctionalArgs1 := NewThing()
thingFunctionalArgs1.Print("functional args 1")
thingFunctionalArgs2 := NewThing(WithName("named thing"))
thingFunctionalArgs2.Print("functional args 2")
// regression testing
regression1033()
//Test deferred builtins
testDeferBuiltin()
}
func runFunc(f func(int), arg int) {
f(arg)
}
func hello(n int) {
println("hello from function pointer:", n)
}
func testDefer() {
defer exportedDefer()
i := 1
defer deferred("...run as defer", i)
i++
defer func() {
println("...run closure deferred:", i)
}()
i++
defer deferred("...run as defer", i)
i++
var t Printer = &Thing{"foo"}
defer t.Print("bar")
println("deferring...")
d := dumb{}
defer d.Value(0)
}
func testDeferLoop() {
for j := 0; j < 4; j++ {
defer deferred("loop", j)
}
}
func testDeferFuncVar() {
dummy, f := deferFunc()
dummy++
defer f(1)
}
func testMultiFuncVar() {
f := multiFuncDefer()
defer f(1)
}
func testDeferBuiltin() {
i := make(chan int)
defer close(i)
}
type dumb struct {
}
func (*dumb) Value(key interface{}) interface{} {
return nil
}
func deferred(msg string, i int) {
println(msg, i)
}
//export __exportedDefer
func exportedDefer() {
println("...exported defer")
}
func deferFunc() (int, func(int)) {
return 0, func(i int){println("...extracted defer func ", i)}
}
func multiFuncDefer() func(int) {
i := 0
if i > 0 {
return func(i int){println("Should not have gotten here. i = ", i)}
}
return func(i int){println("Called the correct function. i = ", i)}
}
func testBound(f func() string) {
println("bound method:", f())
}
// regression1033 is a regression test for https://github.com/tinygo-org/tinygo/issues/1033.
// In previous versions of the compiler, a deferred call to an interface would create an instruction that did not dominate its uses.
func regression1033() {
foo(&Bar{})
}
type Bar struct {
empty bool
}
func (b *Bar) Close() error {
return nil
}
type Closer interface {
Close() error
}
func foo(bar *Bar) error {
var a int
if !bar.empty {
a = 10
if a != 5 {
return nil
}
}
var c Closer = bar
defer c.Close()
return nil
}
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