github.com/FenixAra/go@v0.0.0-20170127160404-96ea0918e670/src/cmd/compile/internal/gc/testdata/map.go (about)

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // map_ssa.go tests map operations.
     6  package main
     7  
     8  import "fmt"
     9  
    10  var failed = false
    11  
    12  //go:noinline
    13  func lenMap_ssa(v map[int]int) int {
    14  	return len(v)
    15  }
    16  
    17  func testLenMap() {
    18  
    19  	v := make(map[int]int)
    20  	v[0] = 0
    21  	v[1] = 0
    22  	v[2] = 0
    23  
    24  	if want, got := 3, lenMap_ssa(v); got != want {
    25  		fmt.Printf("expected len(map) = %d, got %d", want, got)
    26  		failed = true
    27  	}
    28  }
    29  
    30  func testLenNilMap() {
    31  
    32  	var v map[int]int
    33  	if want, got := 0, lenMap_ssa(v); got != want {
    34  		fmt.Printf("expected len(nil) = %d, got %d", want, got)
    35  		failed = true
    36  	}
    37  }
    38  func main() {
    39  	testLenMap()
    40  	testLenNilMap()
    41  
    42  	if failed {
    43  		panic("failed")
    44  	}
    45  }