This is an example D program illustrating some of the capabilities:
#!/usr/bin/dmd -run
/* sh style script syntax is supported */
/* Hello World in D
To compile:
dmd hello.d
or to optimize:
dmd -O -inline -release hello.d
*/
import std.stdio;
void main(char[][] args)
{
writefln("Hello World, Reloaded"
;
// auto type inference and built-in foreach
foreach (argc, argv
args)
{
// Object Oriented Programming
CmdLin cl = new CmdLin(argc, argv);
// Improved typesafe printf
writefln(cl.argnum, cl.suffix, "
arg: %s", cl.argv);
// Automatic or explicit memory management
delete cl;
}
// Nested structs and classes
struct specs
{
// all members automatically initialized
int count, allocated;
}
// Nested functions can refer to outer
// variables like args
specs argspecs()
{
specs* s = new specs;
// no need for '->'
s.count = args.length; // get length of array with .length
s.allocated = typeof(args).sizeof
// built-in native type properties
foreach (argv
args)
s.allocated += argv.length * typeof(argv[0]).sizeof;
return *s;
}
// built-in string and common string operations
writefln("argc = %d, "
~ "allocated = %d",
argspecs().count, argspecs().allocated);
}
class CmdLin
{
private int _argc;
private char[] _argv;
public:
this(int argc, char[] argv) // constructor
{
_argc = argc;
_argv = argv;
}
int argnum()
{
return _argc + 1;
}
char[] argv()
{
return _argv;
}
char[] suffix()
{
char[] suffix = "th";
switch (_argc)
{
case 0:
suffix = "st";
break;
case 1:
suffix = "nd";
break;
case 2:
suffix = "rd";
break;
default:
break;
}
return suffix;
}
}
乍一看像C#呢,为什么叫D....
foreach (argv
args)
s.allocated += argv.length * typeof(argv[0]).sizeof;
这个...Delphi在怎么变,也不会弄成这样的格式,
(argv
args)
typeof(argv[0]).sizeof
...
虽然{ }比 Begin end 方便,但习惯还是比较可怕的,感觉不用Begin..end筐起来就不爽呢!
唉,什么时候也来个D#吧。