March 03, 2010
Hi all,

I'm playing with D2/Phobos, and was wondering what the right way to convert between const char* and string is? In D1/Tango I could use toStringz() and fromStringz() from tango.stdc.stringz, I can only find an equivalent for toStringz in D2/Phobos though, in std.string. What can I use as a replacement to tango's fromStringz, or will I need to roll my own? I also tried using std.conv.to!(), but that doesn't seem to support converting between them.

Robert
March 03, 2010
Robert Clipsham wrote:
> Hi all,
> 
> I'm playing with D2/Phobos, and was wondering what the right way to convert between const char* and string is? In D1/Tango I could use toStringz() and fromStringz() from tango.stdc.stringz, I can only find an equivalent for toStringz in D2/Phobos though, in std.string. What can I use as a replacement to tango's fromStringz, or will I need to roll my own? I also tried using std.conv.to!(), but that doesn't seem to support converting between them.
> 
> Robert

std.conv.to() can convert from const(char)* to string, at least, while std.string.toStringz() converts the other way.

  const(char)* s1 = "Hello";

  string s2 = to!string(s1);
  assert (s2 == "Hello");

  const(char)* s3 = toStringz(s2);
  assert (s3[0..5] == "Hello");

It's a bit weird that std.conv.to() only converts one way, but since std.string is about to be removed from Phobos altogether, I assume it will work both ways in the future.

-Lars