genembed.go

     1  // run
     2  
     3  // Copyright 2021 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Test wrappers/interfaces for generic type embedding another generic type.
     8  
     9  package main
    10  
    11  import "fmt"
    12  
    13  type A[T any] struct {
    14  	B[T]
    15  }
    16  
    17  type B[T any] struct {
    18  	val T
    19  }
    20  
    21  func (b *B[T]) get() T {
    22  	return b.val
    23  }
    24  
    25  type getter[T any] interface {
    26  	get() T
    27  }
    28  
    29  //go:noinline
    30  func doGet[T any](i getter[T]) T {
    31  	return i.get()
    32  }
    33  
    34  //go:noline
    35  func doGet2[T any](i interface{}) T {
    36  	i2 := i.(getter[T])
    37  	return i2.get()
    38  }
    39  
    40  func main() {
    41  	a := A[int]{B: B[int]{3}}
    42  	var i getter[int] = &a
    43  
    44  	if got, want := doGet(i), 3; got != want {
    45  		panic(fmt.Sprintf("got %v, want %v", got, want))
    46  	}
    47  
    48  	as := A[string]{B: B[string]{"abc"}}
    49  	if got, want := doGet2[string](&as), "abc"; got != want {
    50  		panic(fmt.Sprintf("got %v, want %v", got, want))
    51  	}
    52  }
    53
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