• MikeRJ <MeanMike live.com> Nov 19 2008
• Jesse Phillips <jessekphillips gmail.com> Nov 19 2008
• Kagamin <spam here.lot> Nov 20 2008
• "Steven Schveighoffer" <schveiguy yahoo.com> Nov 20 2008

MikeRJ <MeanMike live.com> writes:

For some reason i think DM 1.0 is slowly dieing as i see tons of new features
in D 2.0's phobos not implemented in D 1.0  so im trying to migrate to D2.0

my 1st problem is when i compile code:

	bool open(char[] fn, char[] mode="rb")
	{
		filename=fn.dup;
		file = fopen(toStringz(filename), toStringz(mode));
		if (!file) return false;
		return true;
	}

i receive error:

 cannot implicitly convert expression ("rb") of type invariant(char[2u]) to
char[]|

Jesse Phillips <jessekphillips gmail.com> writes:

On Wed, 19 Nov 2008 22:10:50 -0500, MikeRJ wrote:

 For some reason i think DM 1.0 is slowly dieing as i see tons of new
 features in D 2.0's phobos not implemented in D 1.0  so im trying to
 migrate to D2.0
 
 my 1st problem is when i compile code:
 
 	bool open(char[] fn, char[] mode="rb") {
 		filename=fn.dup;
 		file = fopen(toStringz(filename), toStringz(mode)); if (!


 		false;
 		return true;
 	}
 
 i receive error:
 
 cannot implicitly convert expression ("rb") of type
 invariant(char[2u]) to char[]|






 	bool open(char[] fn, char[] mode="rb".dup) {

will probably make it compile, but since you are using D2 I think the 
correct methodology would be:

 	bool open(string fn, string mode="rb") {

Since you don't make changes to fn or mode they should be invariant.

Also, D1 is not dieing, it is not supposed to get any new features. D2 is 
continually changing which would not be good if you are doing application 
development.

Kagamin <spam here.lot> writes:

MikeRJ Wrote:

 	bool open(char[] fn, char[] mode="rb")
 	{
 		filename=fn.dup;
 		file = fopen(toStringz(filename), toStringz(mode));
 		if (!file) return false;
 		return true;
 	}


D1 and D2 compatible code:

        bool open(in char[] fn, in char[] mode="rb")
        {
                file = fopen(toStringz(fn), toStringz(mode));
                if (!file) return false;
                return true;
        }

"Steven Schveighoffer" <schveiguy yahoo.com> writes:

"MikeRJ" wrote
 For some reason i think DM 1.0 is slowly dieing as i see tons of new 
 features in D 2.0's phobos not implemented in D 1.0  so im trying to 
 migrate to D2.0

 my 1st problem is when i compile code:

 bool open(char[] fn, char[] mode="rb")
 {
 filename=fn.dup;
 file = fopen(toStringz(filename), toStringz(mode));
 if (!file) return false;
 return true;
 }

 i receive error:

 cannot implicitly convert expression ("rb") of type invariant(char[2u]) 
 to char[]|






The correct const-contract usage is:

bool open(const(char)[] fn, const(char)[] mode = "rb")

That is, you are saying open does not modify fn or mode.  It simply uses 
them as input parameters.

The D1/D2 compatible version that Kagamin posted is also legal (and pretty 
much the same thing).

-Steve