github.com/biogo/biogo@v1.0.4/concurrent/example_map_test.go (about)

     1  // Copyright ©2011-2012 The bíogo 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  package concurrent_test
     6  
     7  import (
     8  	"github.com/biogo/biogo/concurrent"
     9  
    10  	"fmt"
    11  )
    12  
    13  type CountConsumer []int
    14  
    15  func (c CountConsumer) Slice(i, j int) concurrent.Mapper { return c[i:j] }
    16  func (c CountConsumer) Len() int                         { return len(c) }
    17  
    18  func (c CountConsumer) Operation() (r interface{}, err error) {
    19  	var sum int
    20  	for i, v := range c {
    21  		sum += v
    22  		c[i] = 0
    23  	}
    24  	return sum, nil
    25  }
    26  
    27  func ExampleMap() {
    28  	c := CountConsumer{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
    29  	fmt.Println(c)
    30  
    31  	for c.Len() > 1 {
    32  		result, err := concurrent.Map(c, 1, 2)
    33  		if err != nil {
    34  			fmt.Println(err)
    35  		} else {
    36  			fmt.Println(result)
    37  			c = c[:0]
    38  			for _, r := range result {
    39  				c = append(c, r.(int))
    40  			}
    41  		}
    42  	}
    43  
    44  	// Output:
    45  	// [1 2 3 4 5 6 7 8 9 10]
    46  	// [3 7 11 15 19]
    47  	// [10 26 19]
    48  	// [36 19]
    49  	// [55]
    50  }