mirror of
https://github.com/golang/go
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0fbde54ea6
- Handle generic function calling itself or another generic function in stenciling. This is easy - after it is created, just scan an instantiated generic function for function instantiations (that may needed to be stenciled), just like non-generic functions. The types in the function instantiation will already have been set by the stenciling. - Handle OTYPE nodes in subster.node() (allows for generic type conversions). - Eliminated some duplicated work in subster.typ(). - Added new test case fact.go that tests a generic function calling itself, and simple generic type conversions. - Cause an error if a generic function is to be exported (which we don't handle yet). - Fixed some suggested changes in the add.go test case that I missed in the last review. Change-Id: I5d61704254c27962f358d5a3d2e0c62a5099f148 Reviewed-on: https://go-review.googlesource.com/c/go/+/290469 Trust: Dan Scales <danscales@google.com> Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
51 lines
945 B
Go
51 lines
945 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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)
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func sum[T interface{ type int, float64 }](vec []T) T {
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var sum T
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for _, elt := range vec {
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sum = sum + elt
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}
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return sum
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}
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func abs(f float64) float64 {
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if f < 0.0 {
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return -f
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}
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return f
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}
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func main() {
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vec1 := []int{3, 4}
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vec2 := []float64{5.8, 9.6}
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got := sum[int](vec1)
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want := vec1[0] + vec1[1]
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if got != want {
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panic(fmt.Sprintf("Got %d, want %d", got, want))
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}
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got = sum(vec1)
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if want != got {
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panic(fmt.Sprintf("Got %d, want %d", got, want))
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}
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fwant := vec2[0] + vec2[1]
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fgot := sum[float64](vec2)
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if abs(fgot - fwant) > 1e-10 {
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panic(fmt.Sprintf("Got %f, want %f", fgot, fwant))
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}
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fgot = sum(vec2)
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if abs(fgot - fwant) > 1e-10 {
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panic(fmt.Sprintf("Got %f, want %f", fgot, fwant))
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}
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}
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