Source file test/typeparam/shape1.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  package main
     8  
     9  type I interface {
    10  	foo() int
    11  }
    12  
    13  // There should be one instantiation of f for both squarer and doubler.
    14  // Similarly, there should be one instantiation of f for both *incrementer and *decrementer.
    15  func f[T I](x T) int {
    16  	return x.foo()
    17  }
    18  
    19  type squarer int
    20  
    21  func (x squarer) foo() int {
    22  	return int(x*x)
    23  }
    24  
    25  type doubler int
    26  
    27  func (x doubler) foo() int {
    28  	return int(2*x)
    29  }
    30  
    31  type incrementer int16
    32  
    33  func (x *incrementer) foo() int {
    34  	return int(*x+1)
    35  }
    36  
    37  type decrementer int32
    38  
    39  func (x *decrementer) foo() int{
    40  	return int(*x-1)
    41  }
    42  
    43  func main() {
    44  	println(f(squarer(5)))
    45  	println(f(doubler(5)))
    46  	var i incrementer = 5
    47  	println(f(&i))
    48  	var d decrementer = 5
    49  	println(f(&d))
    50  }
    51  

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