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Source file test/func5.go

Documentation: test

     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 functions and goroutines.
     8  
     9  package main
    10  
    11  func caller(f func(int, int) int, a, b int, c chan int) {
    12  	c <- f(a, b)
    13  }
    14  
    15  func gocall(f func(int, int) int, a, b int) int {
    16  	c := make(chan int)
    17  	go caller(f, a, b, c)
    18  	return <-c
    19  }
    20  
    21  func call(f func(int, int) int, a, b int) int {
    22  	return f(a, b)
    23  }
    24  
    25  func call1(f func(int, int) int, a, b int) int {
    26  	return call(f, a, b)
    27  }
    28  
    29  var f func(int, int) int
    30  
    31  func add(x, y int) int {
    32  	return x + y
    33  }
    34  
    35  func fn() func(int, int) int {
    36  	return f
    37  }
    38  
    39  var fc func(int, int, chan int)
    40  
    41  func addc(x, y int, c chan int) {
    42  	c <- x+y
    43  }
    44  
    45  func fnc() func(int, int, chan int) {
    46  	return fc
    47  }
    48  
    49  func three(x int) {
    50  	if x != 3 {
    51  		println("wrong val", x)
    52  		panic("fail")
    53  	}
    54  }
    55  
    56  var notmain func()
    57  
    58  func emptyresults() {}
    59  func noresults()    {}
    60  
    61  var nothing func()
    62  
    63  func main() {
    64  	three(call(add, 1, 2))
    65  	three(call1(add, 1, 2))
    66  	f = add
    67  	three(call(f, 1, 2))
    68  	three(call1(f, 1, 2))
    69  	three(call(fn(), 1, 2))
    70  	three(call1(fn(), 1, 2))
    71  	three(call(func(a, b int) int { return a + b }, 1, 2))
    72  	three(call1(func(a, b int) int { return a + b }, 1, 2))
    73  
    74  	fc = addc
    75  	c := make(chan int)
    76  	go addc(1, 2, c)
    77  	three(<-c)
    78  	go fc(1, 2, c)
    79  	three(<-c)
    80  	go fnc()(1, 2, c)
    81  	three(<-c)
    82  	go func(a, b int, c chan int) { c <- a+b }(1, 2, c)
    83  	three(<-c)
    84  
    85  	emptyresults()
    86  	noresults()
    87  	nothing = emptyresults
    88  	nothing()
    89  	nothing = noresults
    90  	nothing()
    91  }
    92  

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