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https://github.com/golang/go
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d7a43e8912
Support 'type C comparable' properly by using the same logic as for 'type T error', since ErrorType and ComparableType are entirely analogous. Added support for 'any' type as well, as requested by Robert. (For the future - we can't currently have 'any' anywhere other than in a constraint.) Fixes #47966 Change-Id: I68bd284ced9a8bfca7d2339cd576f3cb909b1b83 Reviewed-on: https://go-review.googlesource.com/c/go/+/345174 Trust: Dan Scales <danscales@google.com> Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
43 lines
856 B
Go
43 lines
856 B
Go
// run -gcflags=-G=3
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test cases where a main dictionary is needed inside a generic function/method, because
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// we are calling a method on a fully-instantiated type or a fully-instantiated function.
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// (probably not common situations, of course)
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package main
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import (
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"fmt"
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)
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type C comparable
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type value[T C] struct {
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val T
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}
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func (v *value[T]) test(def T) bool {
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return (v.val == def)
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}
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func (v *value[T]) get(def T) T {
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var c value[int]
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if c.test(32) {
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return def
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} else if v.test(def) {
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return def
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} else {
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return v.val
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}
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}
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func main() {
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var s value[string]
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if got, want := s.get("ab"), ""; got != want {
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panic(fmt.Sprintf("get() == %d, want %d", got, want))
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}
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}
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