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// Copyright 2020 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.
// This file tests built-in calls on generic types.
package builtins
import "unsafe"
// clear
func _[T any](x T) {
clear(x /* ERROR "cannot clear x" */)
}
func _[T ~map[int]string | ~[]byte](x T) {
clear(x)
}
func _[T ~map[int]string | ~[]byte | ~*[10]int | string](x T) {
clear(x /* ERROR "cannot clear x" */)
}
// close
type C0 interface{ int }
type C1 interface{ chan int }
type C2 interface{ chan int | <-chan int }
type C3 interface{ chan int | chan float32 }
type C4 interface{ chan int | chan<- int }
type C5[T any] interface{ ~chan T | chan<- T }
func _[T any](ch T) {
close(ch /* ERROR "cannot close non-channel" */)
}
func _[T C0](ch T) {
close(ch /* ERROR "cannot close non-channel" */)
}
func _[T C1](ch T) {
close(ch)
}
func _[T C2](ch T) {
close(ch /* ERROR "cannot close receive-only channel" */)
}
func _[T C3](ch T) {
close(ch)
}
func _[T C4](ch T) {
close(ch)
}
func _[T C5[X], X any](ch T) {
close(ch)
}
// copy
func _[T any](x, y T) {
copy(x /* ERROR "copy expects slice arguments" */ , y)
}
func _[T ~[]byte](x, y T) {
copy(x, y)
copy(x, "foo")
copy("foo" /* ERROR "expects slice arguments" */ , y)
var x2 []byte
copy(x2, y) // element types are identical
copy(y, x2) // element types are identical
type myByte byte
var x3 []myByte
copy(x3 /* ERROR "different element types" */ , y)
copy(y /* ERROR "different element types" */ , x3)
}
func _[T ~[]E, E any](x T, y []E) {
copy(x, y)
copy(x /* ERROR "different element types" */ , "foo")
}
func _[T ~string](x []byte, y T) {
copy(x, y)
copy(y /* ERROR "expects slice arguments" */ , x)
}
func _[T ~[]byte|~string](x T, y []byte) {
copy(x /* ERROR "expects slice arguments" */ , y)
copy(y, x)
}
type L0 []int
type L1 []int
func _[T L0 | L1](x, y T) {
copy(x, y)
}
// delete
type M0 interface{ int }
type M1 interface{ map[string]int }
type M2 interface { map[string]int | map[string]float64 }
type M3 interface{ map[string]int | map[rune]int }
type M4[K comparable, V any] interface{ map[K]V | map[rune]V }
func _[T any](m T) {
delete(m /* ERROR "not a map" */, "foo")
}
func _[T M0](m T) {
delete(m /* ERROR "not a map" */, "foo")
}
func _[T M1](m T) {
delete(m, "foo")
}
func _[T M2](m T) {
delete(m, "foo")
delete(m, 0 /* ERRORx `cannot use .* as string` */)
}
func _[T M3](m T) {
delete(m /* ERROR "must have identical key types" */, "foo")
}
func _[T M4[rune, V], V any](m T) {
delete(m, 'k')
}
func _[T M4[K, V], K comparable, V any](m T) {
delete(m /* ERROR "must have identical key types" */, "foo")
}
// make
type myChan chan int
func _[
S1 ~[]int,
S2 ~[]int | ~chan int,
M1 ~map[string]int,
M2 ~map[string]int | ~chan int,
C1 ~chan int,
C2 ~chan int | ~chan string,
C3 chan int | myChan, // single underlying type
]() {
type S0 []int
_ = make([]int, 10)
_ = make(S0, 10)
_ = make(S1, 10)
_ = make() /* ERROR "not enough arguments" */
_ = make /* ERROR "expects 2 or 3 arguments" */ (S1)
_ = make(S1, 10, 20)
_ = make /* ERROR "expects 2 or 3 arguments" */ (S1, 10, 20, 30)
_ = make(S2 /* ERROR "cannot make S2: no core type" */ , 10)
type M0 map[string]int
_ = make(map[string]int)
_ = make(M0)
_ = make(M1)
_ = make(M1, 10)
_ = make/* ERROR "expects 1 or 2 arguments" */(M1, 10, 20)
_ = make(M2 /* ERROR "cannot make M2: no core type" */ )
type C0 chan int
_ = make(chan int)
_ = make(C0)
_ = make(C1)
_ = make(C1, 10)
_ = make/* ERROR "expects 1 or 2 arguments" */(C1, 10, 20)
_ = make(C2 /* ERROR "cannot make C2: no core type" */ )
_ = make(C3)
}
// max
func _[
P1 ~int|~float64,
P2 ~int|~string|~uint,
P3 ~int|bool,
]() {
var x1 P1
_ = max(x1)
_ = max(x1, x1)
_ = max(1, x1, 2)
const _ = max /* ERROR "max(1, x1, 2) (value of type P1 constrained by ~int | ~float64) is not constant" */ (1, x1, 2)
var x2 P2
_ = max(x2)
_ = max(x2, x2)
_ = max(1, 2 /* ERROR "cannot convert 2 (untyped int constant) to type P2" */, x2) // error at 2 because max is 2
_ = max(x1, x2 /* ERROR "mismatched types P1 (previous argument) and P2 (type of x2)" */ )
}
// min
func _[
P1 ~int|~float64,
P2 ~int|~string|~uint,
P3 ~int|bool,
]() {
var x1 P1
_ = min(x1)
_ = min(x1, x1)
_ = min(1, x1, 2)
const _ = min /* ERROR "min(1, x1, 2) (value of type P1 constrained by ~int | ~float64) is not constant" */ (1, x1, 2)
var x2 P2
_ = min(x2)
_ = min(x2, x2)
_ = min(1 /* ERROR "cannot convert 1 (untyped int constant) to type P2" */ , 2, x2) // error at 1 because min is 1
_ = min(x1, x2 /* ERROR "mismatched types P1 (previous argument) and P2 (type of x2)" */ )
}
// unsafe.Alignof
func _[T comparable]() {
var (
b int64
a [10]T
s struct{ f T }
p *T
l []T
f func(T)
i interface{ m() T }
c chan T
m map[T]T
t T
)
const bb = unsafe.Alignof(b)
assert(bb == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(a)
const _ = unsafe /* ERROR "not constant" */ .Alignof(s)
const pp = unsafe.Alignof(p)
assert(pp == 8)
const ll = unsafe.Alignof(l)
assert(ll == 8)
const ff = unsafe.Alignof(f)
assert(ff == 8)
const ii = unsafe.Alignof(i)
assert(ii == 8)
const cc = unsafe.Alignof(c)
assert(cc == 8)
const mm = unsafe.Alignof(m)
assert(mm == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(t)
}
// unsafe.Offsetof
func _[T comparable]() {
var (
b struct{ _, f int64 }
a struct{ _, f [10]T }
s struct{ _, f struct{ f T } }
p struct{ _, f *T }
l struct{ _, f []T }
f struct{ _, f func(T) }
i struct{ _, f interface{ m() T } }
c struct{ _, f chan T }
m struct{ _, f map[T]T }
t struct{ _, f T }
)
const bb = unsafe.Offsetof(b.f)
assert(bb == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(a)
const _ = unsafe /* ERROR "not constant" */ .Alignof(s)
const pp = unsafe.Offsetof(p.f)
assert(pp == 8)
const ll = unsafe.Offsetof(l.f)
assert(ll == 24)
const ff = unsafe.Offsetof(f.f)
assert(ff == 8)
const ii = unsafe.Offsetof(i.f)
assert(ii == 16)
const cc = unsafe.Offsetof(c.f)
assert(cc == 8)
const mm = unsafe.Offsetof(m.f)
assert(mm == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(t)
}
// unsafe.Sizeof
func _[T comparable]() {
var (
b int64
a [10]T
s struct{ f T }
p *T
l []T
f func(T)
i interface{ m() T }
c chan T
m map[T]T
t T
)
const bb = unsafe.Sizeof(b)
assert(bb == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(a)
const _ = unsafe /* ERROR "not constant" */ .Alignof(s)
const pp = unsafe.Sizeof(p)
assert(pp == 8)
const ll = unsafe.Sizeof(l)
assert(ll == 24)
const ff = unsafe.Sizeof(f)
assert(ff == 8)
const ii = unsafe.Sizeof(i)
assert(ii == 16)
const cc = unsafe.Sizeof(c)
assert(cc == 8)
const mm = unsafe.Sizeof(m)
assert(mm == 8)
const _ = unsafe /* ERROR "not constant" */ .Alignof(t)
}