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add method Value() Value to InterfaceValue.

Browse source 
use Value() in print to print underlying value
from interface.

before:
	package main
	import "fmt"
	func main() {
		x := []interface{} {1, "hello", 2.5};
		fmt.Println(x[0], x[1], x[2], x);
	}

	1 hello 2.5 [<non-nil interface> <non-nil interface> <non-nil interface>]

after:
	1 hello 2.5 [1 hello 2.5]

R=r
DELTA=44  (22 added, 16 deleted, 6 changed)
OCL=27139
CL=27141
This commit is contained in:
Russ Cox 2009-04-06 21:28:04 -07:00
parent b80fdd1e3b
commit ac6ebfdea9
4 changed files with 28 additions and 22 deletions
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7
src/lib/fmt/print.go
View file

@ -451,12 +451,11 @@ func (p *pp) printField(field reflect.Value) (was_string bool) {
}
p.add('}');
case reflect.InterfaceKind:
inter := field.(reflect.InterfaceValue).Get();
if inter == nil {
value := field.(reflect.InterfaceValue).Value();
if value == nil {
s = "<nil>"
} else {
// should never happen since a non-nil interface always has a type
s = "<non-nil interface>";
return p.printField(value);
}
default:
s = "?" + field.Type().String() + "?";