embed.go

     1  // run
     2  
     3  // Copyright 2009 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 methods derived from embedded interface values.
     8  
     9  package main
    10  
    11  import "os"
    12  
    13  const Value = 1e12
    14  
    15  type Inter interface { M() int64 }
    16  
    17  type T int64
    18  func (t T) M() int64 { return int64(t) }
    19  var t = T(Value)
    20  var pt = &t
    21  var ti Inter = t
    22  
    23  type S struct { Inter }
    24  var s = S{ ti }
    25  var ps = &s
    26  
    27  var i Inter
    28  
    29  var ok = true
    30  
    31  func check(s string, v int64) {
    32  	if v != Value {
    33  		println(s, v)
    34  		ok = false
    35  	}
    36  }
    37  
    38  func main() {
    39  	check("t.M()", t.M())
    40  	check("pt.M()", pt.M())
    41  	check("ti.M()", ti.M())
    42  	check("s.M()", s.M())
    43  	check("ps.M()", ps.M())
    44  
    45  	i = t
    46  	check("i = t; i.M()", i.M())
    47  
    48  	i = pt
    49  	check("i = pt; i.M()", i.M())
    50  
    51  	i = s
    52  	check("i = s; i.M()", i.M())
    53  
    54  	i = ps
    55  	check("i = ps; i.M()", i.M())
    56  
    57  	if !ok {
    58  		println("BUG: interface10")
    59  		os.Exit(1)
    60  	}
    61  }
    62
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