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| func NewFile(fd int, name string) *File { | |
| if fd < 0 { | |
| return nil | |
| } | |
| f := File{fd, name, nil, 0} | |
| return &f | |
| } |
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| # The reason for the distinction is that these three types represent, under the covers, references to data structures that must be initialized before use. | |
| var p *[]int = new([]int) // allocates slice structure; *p == nil; rarely useful | |
| var v []int = make([]int, 100) // the slice v now refers to a new array of 100 ints | |
| // Unnecessarily complex: | |
| var p *[]int = new([]int) | |
| *p = make([]int, 100, 100) | |
| // Idiomatic: | |
| v := make([]int, 100) |
make slice
- Remember that make applies only to maps, slices and channels and does not return a pointer. To obtain an explicit pointer allocate with new or take the address of a variable explicitly.
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data-constructor.go
return 的另外一种写法
NewFile是一种推崇的constructor写法