Pelle wrote:
On 09/08/2010 09:23 AM, Tom Kazimiers wrote:
Hi,
I try to read data in from a file. This data consist mainly of numbers
and I have a hard time converting it to number type variables. Two data
lines could look like this
v 0 0 0
v 1.5 1.2 0
Now I want to parse those lines and call a method, the line in passed
(as char[]) to it:
int index = indexOf(line, "v ");
if(index != -1) {
vc++;
float x = 0.0, y = 0.0, z = 0.0;
char[][] vertexCoords = split( line[index+2 .. $] );
if (vertexCoords.length> 0)
x = to!int(vertexCoords[0]);
if (vertexCoords.length> 1)
y = to!int(vertexCoords[1]);
if (vertexCoords.length> 2)
z = to!int(vertexCoords[2]);
process_vertex(vc,x,y,z);
return;
}
First I split the remaining characters (after "v ") into parts (here is
probably dynamic copying included?). Then I want to convert each part to
a float value.
The problem I have is that I obviously need to use "to!int" for numbers
with out decimal point and "to!float" for numbers with. But since those
can be mixed I would ask for every part if there is a decimal point, e.g:
if (vertexCoords.length> 0) {
if (indexOf(vertexCoords[0], ".") != -1)
x = to!float(vertexCoords[0]);
else
x = to!int(vertexCoords[0]);
}
Is there a more convient way to achieve that? I am coming from C++ and
IIRC one could do there sth. like this:
int index = line.find("v ");
if(index != std::string::npos) {
line.erase(0,index+1);
vc++;
float x,y,z = 0;
std::istringstream ins;
ins.str(line);
ins>> x>> y>> z;
process_vertex(vc,x,y,z);
return;
}
That looks much cleaner to me (besides the ">>" operators). So I am
looking for sth. similar in D :-). Maybe a to!float that can cope with
numbers without decimal point.
Cheers,
Tom
You seem to have found a bug in to!float :-)
to!float("123") works as expected, but to!float("0") bugs out. Huh!
Yes, it's a shocking bug. It's been fixed in svn for a couple of weeks,
but we haven't made a release yet.
