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https://github.com/golang/go
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12e15d430d
- Have to delay the extra transformation on methods invoked on a type param, since the actual transformation (including path through embedded fields) will depend on the instantiated type. I am currently doing the transformation during the stencil substitution phase. We probably should have a separate pass after noder2 and stenciling, which drives the extra transformations that were in the old typechecker. - We handle method values (that are not called) and method calls. We don't currently handle method expressions. - Handle type substitution in function types, which is needed for function args in generic functions. - Added stringer.go and map.go tests, testing the above changes (including constraints with embedded interfaces). Change-Id: I3831a937d2b8814150f75bebf9f23ab10b93fa00 Reviewed-on: https://go-review.googlesource.com/c/go/+/290550 TryBot-Result: Go Bot <gobot@golang.org> Trust: Dan Scales <danscales@google.com> Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Dan Scales <danscales@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
39 lines
899 B
Go
39 lines
899 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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package main
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import (
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"fmt"
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"reflect"
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"strconv"
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)
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// Map calls the function f on every element of the slice s,
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// returning a new slice of the results.
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func mapper[F, T any](s []F, f func(F) T) []T {
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r := make([]T, len(s))
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for i, v := range s {
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r[i] = f(v)
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}
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return r
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}
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func main() {
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got := mapper([]int{1, 2, 3}, strconv.Itoa)
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want := []string{"1", "2", "3"}
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if !reflect.DeepEqual(got, want) {
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panic(fmt.Sprintf("Got %s, want %s", got, want))
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}
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fgot := mapper([]float64{2.5, 2.3, 3.5}, func(f float64) string {
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return strconv.FormatFloat(f, 'f', -1, 64)
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})
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fwant := []string{"2.5", "2.3", "3.5"}
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if !reflect.DeepEqual(fgot, fwant) {
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panic(fmt.Sprintf("Got %s, want %s", fgot, fwant))
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}
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}
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